Vascular Plants of Orange County, California

Compiled by Peter J. Bryant, School of Biological Sciences, University of California, Irvine, Irvine, CA 92697. To comment, mailto:pjbryant@uci.edu

To understand plant diversity and evolution, visit Bio1b Plants, at UC Berkeley

Dicots
Adoxaceae: Elderberry Aizoaceae: Ice Plants, Fig-marigolds

Blue Elderberry, Sambucus nigra ssp. caerulea

* Sea-Fig,
Carpobrotus chilensis

* Hottentot-Fig,
Carpobrotus edulis

* Red Iceplant,
Malephora crocea

* Crystalline Iceplant,
Mesembryanthemum crystallinum
Aizoaceae: Ice Plants, Fig-marigolds (cont.)     Amaranthaceae: Amaranths

* Slender-leaved Iceplant, Mesembryanthemum nodiflorum

Western Sea-Purslane,
Sesuvium verrucosum
   
* Rough Pigweed,
Amaranthus retroflexus
Anacardiaceae: Sumacs or Cashews. All Southern California members of this family are woody shrubs with milky or resinous sap.  Flowers are small; sepals and petals are in 5's on a cup-like dish with 5 stamens and 3 styles.  They are insect-pollinated. There is sometimes a disk with nectaries surrounding the base of the ovary (Clarke). Cashews, mangoes and pistachios belong to this family. 

Laurel Sumac,
Malosma laurina

Skunkbush,
Rhus aromatica

Sugar Bush,
Rhus ovata

Lemonade Berry,
Rhus integrifolia

Western Poison Oak, Toxicodendron diversilobum
Anacardiaceae: Sumacs or Cashews (cont.)      
     

* Peruvian Pepper Tree,
Schinus molle

* Brazilian Pepper Tree,
Schinus terebinthifolius
     
Apiaceae: Carrots

* Bur-chervil,
Anthriscus caucalis

* Celery,
Apium graveolens

* Poison hemlock,
Conium maculatum

American Wild Carrot,
Daucus pusillus

* Sweet Fennel,
Foeniculum vulgare

California Sweet Cicely,
Osmorhiza brachypoda

Sharp-tooth Sanicle (Snakeroot), Sanicula arguta

Pacific Sanicle,
Sanicula crassicaulis

Southern Tauschia,
Tauschia arguta
 
Apocynaceae: Dogbanes (including Asclepiadaceae: Milkweeds). See The Remarkable Bisexual Milkweed Blossom

California Milkweed (Round Hooded Milkweed), Asclepias californica

* Tropical milkweed,
Asclepias currassavica

Indian milkweed,
Asclepias eriocarpa

Narrow-leaved milkweed,
Asclepias fascicularis

Milkweed Balloon Plant,
Asclepias physocarpa

Climbing Milkweed, Funastrum
cyanchoides car hartwegii

* Periwinkle,
Vinca major
     
Asteraceae: Sunflowers Bataceae: Saltworts Betulaceae: Birches and Alders Berberidaceae: Barberries  

(Separate index page)

Saltwort,
Batis maritima

White Alder,
Alnus rhombifolia

California Barberry,
Berberis pinnata
 

Boraginaceae: Borages


Common Fiddleneck,
Amsinckia intermedia

* Pride of Madeira,
Echium candicans

Whispering Bells,
Emmenanthe penduliflora

Thickleaf Yerba Santa,
Eriodictyon crassifolium

Common eucrypta,
Eucrypta chrysanthemifolia

Alkali heliotrope,
Heliotropium curassavicum

Mud Nama,
Nama stenocarpum

Baby blue-eyes,
Nemophila menziesii

Slender pectocarya,
Pectocarya linearis ssp. ferocula

Caterpillar phacelia,
Phacelia cicutaria

Common Phacelia,
Phacelia distans

Wild Canterbury bells,
Phacelia minor

Parry's Phacelia,
Phacelia parryi

Branching phacelia,
Phacelia ramosissima

Tansy phacelia,
Phacelia tanacetifolia

Blue Fiesta Flower,
Pholistoma auriyum

Rusty Popcorn flower,
Plagiobothrys nothofulvus
     
Brassicaceae: Mustards

* Black mustard, Brassica nigra

Field Mustard, Brassica rapa

Sea Rocket, Cakile maritima

* Shepherd's Purse,
Capsella bursa-pastoris

Milkmaids,
Cardamine californica

Slender-pod jewelflower,
Caulanthus heterophyllus

Tansy mustard,
Descurainia pinnata

* Short-podded mustard,
Hirschfeldia incana

* Lesser wartcress,
Lepidium didymum

Sand peppergrass,
Lepidium lasiocarpum

* Perennial peppergrass,
Lepidium latifolium

Shiny Peppergrass,
Lepidium nitidum

* Garden stock,
Matthiola incana

* Watercress,
Nasturtium officinale

Wild radish, Raphanus sativus

* London Rocket, Sisymbrium irio

Lace-pod (Fringe-pod), Thysanocarpus sp.
     
Cactaceae: Cactuses Caprifoliaceae: Honeysuckles

Coast Cholla (Coastal Cholla), Cylindropuntia prolifera

Coast Prickly Pear,
Opuntia littoralis

Oracle Cactus,
Opuntia oricola

Southern Honeysuckle, Lonicera subspicata var. denudata

Spreading Snowberry, Symphoricarpos mollis
Caryophyllaceae: Pinks

* Windmill pink,
Silene gallica

Fringed Indian Pink (Southern Pink, Mexican Pink), Silene laciniata

* Corn Spurry,
Spergularia arvensis

* Hairy Sand Spurry,
Spergularia villosa

* Common Chickweed,
Stellaria media
Chenopodiaceae: Goosefoots  

California Saltbush,
Atriplex californica

Fourwing Saltbush,
Atriplex canescens

Quailbush (Big Saltbush, Brewer's Saltbush), Atriplex lentiformis

* Australian Saltbush,
Atriplex semibaccata

Spearscale,
Atriplex triangularis

* Five-hook Bassia,
Bassia hyssopifolia

* Lamb's Quarters (Pigweed), Chenopodium album

California goosefoot,
Chenopodium californicum

* Nettle-leaved Goosefoot, Chenopodium murale

* Tasmanian Goosefoot,
Chenopodium pumilio

Virginia Pickleweed,
Salicornia virginica

* Russian Thistle
(Tumbleweed), Salsola tragus


Estuary Sea-blite,
Suaeda esteroa

Woolly sea-blite,
Suaeda taxifolia
 
Cistaceae: Rock-roses   Cleomaceae: Capers

* Rock Rose,
Cistus sp.

California Rush Rose,
Helianthemum scoparium
   
Bladderpod,
Peritoma arborea
Convolvulaceae: Morning glories

Morning Glory,
Calystegia macrostegia ssp.

Field Bindweed,
Convolvulus arvensis

Alkali Weed,
Cressa truxillensis

California dodder,
Cuscuta californica

Western field dodder,
Cuscuta pentagona
Convolvulaceae (cont) Cucurbitaceae: Gourds Cornaceae: Dogwoods

Salt Marsh Dodder,
Cuscuta salina var. major

Canyon dodder,
Cuscuta subinclusa

Wild Gourd (Calabazilla, Coyote gourd), Cucurbita foetidissima

Wild Cucumber (Manroot), Marah macrocarpus var. macrocarpus
 
Crassulaceae: Stonecrops

Pygmy-weed,
Crassula connata

Ladies' Fingers,
Dudleya edulis

Lanceleaf Dudleya,
Dudleya lanceolata

Many-stemmed Dudleya,
Dudleya multicaulis

Chalk Dudleya,
Dudleya pulverulenta
Datiscaceae: Datiscas. A small family with only 2-4 species. In the U.S. there is only one representative.  Its nearest relatives are begonias and gourds.  Ericaceae: Heaths. All members are perennial and include wintergreen, pipe plant, blueberry, cranberry, azalea and rhododendron. Flower structure varies widely within the family with one unique feature; the anthers release pollen from a small pore at the tip rather than through slit openings as in most other families.  This pore is often accompanied by a whisker-like appendage that when disturbed by a bee, shakes pollen onto it like a salt shaker (Clarke).  The genus Arctostaphylos (Manzanita) has only 2 species in Orange County, but over 38 native to California.  They are perennial shrubs in chaparral with smooth, dark chestnut-red stems and branches.  The bark exfoliates seasonally.  The manzanita leaf-gall aphid (Tamalia coweni) causes numerous conspicuous green or reddish roll galls on the edges of leaves (Clarke).

Durango Root, Datisca gomerata


Eastwood manzanita,
Arctostaphylos glandulosa

Bigberry manzanita,
Arctostaphylos glauca

Summer Holly,
Comarostaphylis diversifolia
 
Euphorbiaceae: Spurges (Notes on Euphorbias and Chamaesyces)

California Copperleaf,
Acalypha californica

Rattlesnake weed,
Chamaesyce albomarginata

Small-seeded sandmat,
Chamaesyce polycarpa

* Matted sandmat,
Chamaesyce serpens

California Croton,
Croton californicus

Doveweed (Turkey mullein),
Croton setigerus

* Gopher spurge (Mole plant), Euphorbia lathyris

* Spotted spurge,
Euphorbia maculata

Cliff Spurge,
Euphorbia misera

Petty Spurge (Cancer weed), Euphorbia peplus

* Castor-bean,
Ricinis communis
       
Fabaceae: Legumes; Subfamily Faboideae: Five petals, the upper-most (the "banner") being the largest and most conspicuous.  There are two side petals termed wings. The two lower petals form the boat-like keel, and are usually fused together at the lower margins (apex). They house the reproductive structures. There is one elongated superior ovary with a curved style. There are nine stamens with fused filaments, and a 10th which is free. Pollinating insects cause the hinged keel to deflex when they land.  This exposes the reproductive structures to the underside of the insect, depositing pollen and allowing pollen previously collected to reach the stigma.  Leaf-cutter bees (Megachilidae) are among the most frequent pollinators of this subfamily (Clarke p. 228).

Spanish Clover,
Acmispon americanus

Common Deerweed (California broom), Acmispon glaber


Heermann's Lotus,
Acmispon hermannii


Small-flowered Lotus (Fishhook Lotus), Acmispon micranthus

Coastal lotus,
Acmispon salsuginosus

Strigose Lotus,
Acmispon strigosus

California Lotus,
Acmispon wrangelianus

California False Indigo,
Amorpha californica

Western false indigo,
Amorpha fruticosa


Pomona Locoweed,
Astragalus pomonensis

Ocean Locoweed,
Astragalus trichopodus var. lonchus


Sweet Pea,
Lathyrus vestitus

* Bird's Foot Trefoil,
Lotus corniculatus

Silver Bush Lupine,
Lupinus albifrons

Miniature Lupine,
Lupinus bicolor

Bajada Lupine,
Lupinus concinnus

Bush Lupine (Guard Lupine), Lupinus excubitus var. hallii

Stinging Lupine,
Lupinus hirsutissimus

Chick Lupine (Valley Lupine), Lupinus microcarpus

Coulter's Lupine,
Lupinus sparsiflorus

Arroyo Lupine,
Lupinus succulentus

Collar Lupine,
Lupinus truncatus

* Bur-clover,
Medicago polymorpha

* White Sweetclover,
Melilotus albus

* Yellow Sweetclover,
Meliotus indicus

Chaparral pea,
Pickeringia montana

* Spanish Broom,
Spartium junceum

Tree Clover,
Trifolium ciliolatum?

* Rose Clover,
Trifolium hirtum

Maiden Clover (Small-headed Clover), Trifolium microcephalum

Creek Clover,
Trifolium obtusiflorum

* Red Clover,
Trifolium pratense

Wildcat Clover,
Trifolium willdenovii

American Vetch,
Vicia americana

Winter Vetch,
Vicia villosa
Fagaceae: Oaks. The Oak family in OC is represented by only one genus, Quercus.  They are divided into deciduous and evergreen (or live oak).  Acorns produced by the trees are an important food source for wildlife and were a staple food for California Native Americans. Oaks are host to many gall-forming insects.

Coast Live Oak,
Quercus agrifolia

California Scrub Oak,
Quercus berberidifolia

Canyon Oak,
Quercus chrysolepis


Engelmann oak,
Quercus engelmannii


Interior Live Oak,
Quercus wislizenii
Frankeniaceae: Frankenias Garryaceae Monogeneric with 18 species worldwide.  Two are found in Orange County.  They are evergreen shrubs with opposite leaves, flowers in catkins, and fruit a berry.  Gentianaceae: Gentians  

Alkali heath,
Frankenia salina

Pale (Ashy, Yellow-leaf) Silk-Tassel, Garrya flavescens
 
Canchalagua,
Centaurium venustum
 
Geraniaceae: Geraniums    

* Long-beaked filaree,
Erodium botrys


* Red-stemmed filaree,
Erodium cicutarium

* White-stemmed filaree,
Erodium moschatum
   
Grossulareaceae: Gooseberries and currants. The family contains only one genus, Ribes, with 7 native species (one with two variants) represented in Orange County.  All are generally upright perennial shrubs. Flowers are 5-merous and bisexual; the fruit is a berry. Sepals are petal-like, more prominent than the shorter true petals, which form a cylinder around the stamens and pistil (Clarke, p. 219). The genus Ribes include the currants, gooseberries and many ornamental plants. Gooseberry fruit is bristly, and stems have nodal spines; currants have smooth-skinned fruit and no spines. Flowers have a cup-like hypanthium.

Bitter Gooseberry,
Ribes amarum

Golden Currant,
Ribes aureum

Hillside Gooseberry,
Ribes californicum

White-flowered Currant,
Ribes indecorum

Chaparral Currant,
Ribes malvaceum
Grossulareaceae (cont.)       Juglandaceae: Walnuts

Fuchsia-flowered Gooseberry,
Ribes speciosum
     
California Black Walnut,
Juglans californica
Lamiaceae: Mints and Sages

* Henbit,
Lamium amplexicaule

* Common Horehound (White Horehound), Marrubium vulgare

Mustang Mint,
Monardella breweri ssp. lanceolata

White Sage,
Salvia apiana

Chia,
Salvia columbariae

Purple Sage,
Salvia leucophylla

Black Sage,
Salvia mellifera

Hummingbird Sage,
Salvia spathacea

Rigid hedge-nettle,
Stachys ajugoides var. rigida

California Hedge-nettle,
Stachys bullata
Lamiaceae: Mints and Sages (cont.) Lauraceae: Laurels Lythraceae: Loosestrifes

Woolly Blue-curls,
Trichostema lanatum
s

Vinegar weed,
Trichostema lanceolatum

California Bay Laurel,
Umbellularia californica

* Hyssop loosestrife (Grass-poly), Lythrum hyssopifolia

* Pomegranate,
Punica granatum
MalvaceaeMallows

Island Mallow,
Lavatera assurgentiflora

Bush Mallow,
Malacothamnus fasciculatus


* Bull Mallow,
Malva nicaeensis

* Cheeseweed,
Malva parviflora

Alkali Mallow,
Malvella leprosa
Malvaceae: Mallows (cont.) Montiaceae: Montias      

Few-leaved Checker Bloom,
Sidalcea sparsifolia

Red Maids,
Calandrinia ciliata var. menziesii

Narrow-leaf Miner's Lettuce, Claytonia parviflora ssp. parviflora

Miner's Lettuce,
Claytonia perfoliata ssp. perfoliata
 
Moraceae: Mulberries and Figs    

Myrsinaceae: Primroses


White Mulberry,
Morus alba
     
* Scarlet Pimpernel,
Anagallis arvensis

MYOPORACEAE: Myoporums | MYRTACEAE: Myrtles

Nyctaginaceae: Four o'clocks Oleaceae: Olives. There are two native and one uncommon non-native Fraxinus in Orange County (Roberts).  In addition we have non-native privet (Lingustrum) species (2) and common olive in the family.  Ornamentals in this family include garden lilac (Syringa), Forsythia, fringe-tree and true jasmine.

Red sand verbena,
Abronia maritima

Pink Sand Verbena (Beach Sand Verbena), Abronia umbellata

Wishbone bush,
Mirabilis laevis var. crassifolia
 
California Flowering-Ash,
Fraxinus dipetala
Onagraceae: Evening Primroses. Four sepals, usually bent downward (reflexed), 4 showy petals, 8 stamens, one pistil and an inferior ovary.  (There is only one plant that does not follow this pattern, Ludwigia peploides which has 5 petals,  5 sepals and 10 stamens).  The genus Camissonia is told from Oenothera by the stigma and bloom time.  Camissonia has a spherical stigma and blooms in morning while Oenothera has a 4-part stigma and blooms in evening. 

Sun Cup,
Camissoniopsis bistorta

Beach evening primrose,
Camissoniopsis cheiranthifolia

Hairy Sun Cup,
Camissoniopsis hirtella

Small evening primrose,
Camissoniopsis micrantha

Strigulose evening primrose,
Camissonia strigulosa

Farewell-to-Spring,
Clarkia bottae


Purple Clarkia,
Clarkia purpurea ssp. quadrivulnera


California Fuchsia,
Epilobium canum

Fringed Willowherb, Epilobium
ciliatum ssp. ciliatum

Yellow Water-primrose,
Ludwigia peploides
Orobanchaceae: Broomrapes

Coast Paintbrush,
Castilleja affinis ssp. affinis

Purple Owl's Clover,
Castilleja exserta ssp. exserta

Woolly Paintbrush (Felt Paintbrush), Castilleja foliosa

Lesser Indian Paintbrush (California Threadtorch), Castilleja minor
 
Orobanchaceae: Broomrapes (cont.) Oxalidaceae: Oxalids Paeoniaceae: Peonies

Salt Marsh Bird's Beak, Cordylanthus maritimus ssp. maritimus


Dark-tipped Bird's Beak,
Cordylanthus rigidus ssp. setiger

* Creeping wood-sorrel,
Oxalis corniculata

* Bermuda Buttercup,
Oxalis pes-caprae

California Peony,
Paeonia californica
Papaveraceae: Poppies

Bush Poppy,
Dendromecon rigida

Golden Ear-drops,
Ehrendorferia chrysantha

California Poppy,
Eschscholzia californica

Small-flowered Meconella, Meconella denticulata

Coulter's Matilija Poppy,
Romneya coulteri
Phrymaceae: Lopseed and Monkeyflowers

Sticky Monkeyflower,
Mimulus aurantiacus

Yellow Monkeyflower,
Mimulus brevipes

Scarlet Monkeyflower,
Mimulus cardinalis

Seep Monkey flower,
Mimulus guttatus

Downy Monkey flower,
Mimulus pilosus
Plantaginaceae: Plantains

Twining Snapdragon,
Antirrhinum kelloggii

Violet Snapdragon (Nuttall's Snapdragon), Antirrhinum nuttallianum, ssp. nuttallianum

Violet Snapdragon (Nuttall's Snapdragon), Antirrhinum nuttallianum spp. subsessile

Southern Chinese Houses,
Collinsia concolor

Purple Chinese Houses,
Collinsia heterophylla

Parry's Blue-eyed Mary,
Collinsia parryi

Yellow Bush Penstemon,
Keckiella antirrhinoides

Heart-leaved Bush Penstemon, Keckiella cordifolia

Blue Toadflax,
Nuttallanthus texanus

Scarlet Bugler,
Penstemon centranthifolius

Grinnell's Penstemon,
Penstemon grinnellii

Foothill Penstemon,
Penstemon heterophyllus

Showy Penstemon, Penstemon spectablis ssp. spectabilis


California plantain,
Plantago erecta


* English Plantain,
Plantago lanceolata
Plantaginaceae: Plantains (cont.)   Platanaceae: Plane Tree, Sycamores Plumbaginaceae:
Leadworts

* Common Plantain,
Plantago major

* Water Speedwell,
Veronica anagallis-aquatica
PHILADELPHACEAE:
Mock Oranges PHYTOLACCACEAE:
Pokeweeds PITTOSPORACEAE:
Pittosporums

Western Sycamore,
Platanus racemosa

California Marsh-rosemary (Sea Lavender), Limonium californicum

Polemoniaceae: Phloxes. The flowers are 5-merous (5 united petals in a funnel shape, 5 narrow united sepals, 5 stamens with anthers attached to the corolla tube).  The superior ovary consists of three fused carpels with a three-part stigma (an unusual number for a dicot).  At maturity the seed capsule opens by three valves.  California is a center of diversity for this family.


Blue False-gilia,
Allophyllum glutinosum

Sapphire Wool Star,
Eriastrum sapphirinum

Los Angeles Gilia,
Gilia angelensis

Globe or Blue-headed Gilia,
Gilia capitata

Bird's-eye Gilia,
Gilia tricolor

Whisker-brush,
Leptosiphon ciliatus

Many-flowered Linanthus, Leptosiphon floribundus

Flax-flowered Linanthus, Leptosiphon liniflorus

Coast Baby-star,
Leptosiphon parviflorus

Prickly Phlox,
Linanthus californicus

Ground Pink,
Linanthus dianthiflorus

Hollyleaf Navarretia,
Navarretia atractyloides

Hooked Navarretia,
Navarretia hamata ssp. leptantha
POLYGALACEAE:
Milkworts
 
Polygonaceae: Buckwheats: Subfamily Eriogonoideae (lacking an ocrea)

Fringed Spineflower, Chorizanthe fimbriata var. fimbriata

Prostrate Spineflower,
Chorizanthe procumbens

Turkish Rugging,
Chorizanthe staticoides

Long-stemmed Buckwheat (Wand Buckwheat), Eriogonum elongatum

California Buckwheat,
Eriogonum fasciculatum spp. fasciculatum

Leafy Buckwheat, Eriogonum fasciculatum ssp. foliolosum

Bluff (Dune, Seacliff) Buckwheat, Eriogonum parvifolium

Rock Buckwheat,
Eriogonum saxatile

Coast Woolly Heads,
Nemacaulis denudata

Granny's Hairnet (Threadstem), Pterostegia drymarioides
Polygonaceae: Buckwheats (cont.): Subfamily Polygonoideae, with an ocrea. Primulaceae: Primroses

* Willow or Pale Smartweed, Persicaria (= Polygonum) lapathifolia

* Lady's Thumb, Persicaria (= Polygonum) maculosa (= vulgaris)

* Curly Dock,
Rumex crispus

Willow Dock,
Rumex salicifolius

Padre's Shooting Star,
Dodecatheon clevelandii
Ranunculaceae: Buttercups
All three species of Clematis are woody perennial twining vines on slopes in chaparral, in foothills and Santa Ana Mountains. They generally have compound leaves with sheaths as the leaf bases, and flowers with many stamens and many pistils. Flowers are generally unisexual, occasionally dioecious (male and female sex organs on different plants).  All contain alkaloids that make them unpalatable (Clarke). There are 4 petal-like white or cream sepals ("bracts"; Clarke), and no petals.  Fruits are achenes (single seeded fruit produced by a single carpel) with a long feathery style.

Pipestems,
Clematis lasiantha

Virgin's Bower,
Clematis ligusticifolia
Ropevine, Clematis pauciflora, is most prevalent in sage scrub on dry rocky slopes in the Santa Ana Mountains.  It is also a spring-flowering plant with hairless fruit bodies (achenes). Flowers are in clusters of one to three. Sepals are smooth above, hairy below.  There are 30-50 stamens; 25-50 pistils.
Scarlet Larkspur,
Delphinium cardinale

Parry's Larkspur,
Delphinium parryi

Blue Larkspur,
Delphinium patens

California Buttercup,
Ranunculus californicus


Delicate Buttercup,
Ranunculus hebecarpus


Western Buttercup,
Ranunculus occidentalis
 

Meadow Rue,
Thalictrum fendleri (male)

Meadow Rue,
Thalictrum fendleri (female)
     
There is a third scarce species of Ranunculus, R. cymbalaria, Desert Buttercup, which occurs along the Santa Ana river and was found at Upper Newport Bay in 1966.
Rhamnaceae: Buckthorns. Shrubs or small trees recognized by 4-5-merous flowers, superior ovaries, and stamens that arise from the bases of the petals rather than between them. In families lacking petals, stamens alternate with sepals.  The flower receptacles have the appearance of a peace sign when the upper flower parts have fallen.  This family is one of only a few non-legumes to have root nodules containing nitrogen fixing bacteria (Clarke).
Ceanothus (Wild lilac) occur only in North America with California being the center of distribution. Some species have a unique leaf-vein structure with 3 prominent parallel veins extending from the leaf base to the outer leaf tips. Most are evergreen.  Fruits are hard, nut-like 3-lobed capsules.  Seeds can lie dormant for hundreds of years and many need fire to germinate.  Hybrids are common and difficult to identify.

Hoary-leaved Ceanothus,
Ceanothus crassifolius

Chaparral Whitethorn,
Ceanothus leucodermis

Bigpod Ceanothus,
Ceanothus megacarpus

Hairy Ceanothus,
Ceanothus oliganthus

Greenbark Ceanothus,
Ceanothus spinosus
Rhamnus are distinguished from Ceanothus by the soft, berry-like fruit and leaves which have parallel lateral veins extending from a single midrib (Clarke)

Italian Buckthorn,
Rhamnus alaternus

California Coffee Berry,
Rhamnus californica

Holly-leaved Redberry,
Rhamnus ilicifolia
   
Rosaceae: Roses. One of the most diverse plant families including many ornamentals (roses, pyracantha, etc.) as well as commercially important crops (berries, apples, pears, quince, loquats, apricots, plums, cherries, almonds). Common to this family is a cup-like flower structure called the hypanthium from which the sepals, petals and stamens arise.  Flowers are generally 5-merous except stamens which are usually at least twice the number of petals. There are 5 or more carpels or female organs.  Leaves are generally alternate with stipules at the leaf base.  There are 3-4 major evolutionary lines with divisions based in part on fruit structure and seed dispersal methods (Clarke).

Chamise, Adenostoma fasciculatum var. fasciculatum

California or Birch-leaf Mountain Mahogany, Cercocarpus betuloides

Mesa Horkelia,
Horkelia cuneata ssp. puberula

Toyon,
Heteromeles arbutifolia

Sticky Cinquefoil, Potentilla (=Drymocallis) glandulosa

Holly-leaved Cherry,
Prunus ilicifolia ssp. ilicifolia

California (Wild) Rose,
Rosa californica

* Himalayan Blackberry,
Rubus armeniacus

California Blackberry,
Rubus ursinus
 
Rubiaceae: Madders. This family contains a few species of economic importance including coffee (Coffea) and quinine (Cinchona).  The family is distinguished  by having paired seeds and an inferior ovary.  Leaves are opposite with stipules that arise between the leaves. The stipules are usually fused, or occasionally leaf-like, like those in local Galium species (Clarke). Erect to rambling with slender stems that often form a tangled mass or intertwine with other shrubs.  The native species' plants are either male or female (dioecious) while the exotic G. aparine is bisexual.   Leaves appear to be whorled but there are only two true leaves at each node.  The other structures are modified stipules.  In all but one species, flowers are 4-merous, and lack a calyx.  Members of this genus were once used in curdling milk (Clarke). Rutaceae: Rues

Common Bedstraw,
Galium aparine

Narrow-leaved Bedstraw,
Galium angustifolium

Climbing Bedstraw,
Galium nuttallii spp. nuttallii

Climbing Bedstraw,
Galium sp.

Bush Rue,
Cneoridium dumosum
Salicaceae: Cottonwoods and Willows. This family includes cottonwoods (Populus) and willows (Salix), both indicators of the riparian woodland plant community. Cottonwoods are large trees while willows range from medium sized trees to shrubs.  Leaves are deciduous, simple and alternate. All are dioecious with male and female flowers appearing on different plants as elongate catkins, aggregates of pollen or seed-bearing flowers.  The staminate (male) flowers have 2-10 stamens;  pistillate (female) flowers have  2 fused pistils; neither have a calyx or corolla. Cottonwood seeds have larger more spherical capsules which open by 3 valves while willow capsules are small and slender, splitting into two valves.  The minute seeds with long silky tails that help in wind dispersal. Some species shed large amounts of cottony seed masses.  Salix can also be insect pollinated. Hybrids among Salix are common, making identification difficult. Populus are differentiated from Salix by leaf shape, bract segments, and number of stamens on male plant (8-60 in Populus vs. 2-10 in Salix). Sapindaceae: Maples

Fremont Cottonwood,
Populus fremontii ssp. fremontii

Narrow-leaved Willow (Sandbar Willow), Salix exigua

Black Willow (Goodding's Willow), Salix gooddingii var. variabilis

Arroyo Willow,
Salix lasiolepis

Big-leaf Maple,
Acer macrophyllum

Saururaceae: Lizard's tails

Saxifragaceae: Saxifrages. All are perennial herbs, generally with 5-merous flowers and two ovules in a cup-like structure from the edge of which arise the sepals, petals and stamens.

Scrophulariaceae: Figworts

Yerba Mansa, Anemopsis californica

Parry's Jepsonia (Coast Jepsonia), Jepsonia parryi

Woodland Star,
Lithophragma affine ssp. mixtum

Micranthes (Saxifraga) californica

California Figwort (Bee Plant), Scrophularia californica
Solanaceae: Flowers in this family are generally 5-merous with a superior ovary. Fruits range from berries to dry capsules. Most members of this family are susceptible to a root knot nematode (Meloidogyne), and many are larval foodplants for the tomato hornworm (Hummingbird Hawk Moth, Manduca quinquemaculata) (Clarke).

Jimsonweed (Tolguacha),
Datura wrightii

California Boxthorn,
Lycium californicum

* Tree Tobacco,
Nicotiana glauca

Indian Tobacco,
Nicotiana quadrivalvis

Thick-leaved Ground-cherry, Physalis crassifolia
Solanaceae (cont.). Genus Solanum, the nightshades.  This large genus includes edible plants such as tomato, potato and eggplant, but the foliage and unripe fruits of many others are poisonous to humans.  As in most of this family, flowers are 5-merous, but they are distinguished by anthers which are pressed tightly together with 2 pores at the tip.  Pollen is released from these pores in response to vibration. Bumble bees (but not honey bees) vibrate their bodies thereby more effectively releasing the pollen. The ability to "buzz pollinate" is one reason that bumble bees are used commercially to pollinate hothouse tomatoes.

Tropaeolaceae: Tropaeolum family

Ulmaceae: Elms

* Small-flowered (White) Nightshade, Solanum americanum

Douglas' Nightshade,
Solanum douglasii

Purple Nightshade,
Solanum sp.

* Garden Nasturtium,
Tropaeolum majus
 
Urticaceae: Nettles. Stinging hairs (trichomes) are diagnostic of nettles. Skin contact should be avoided with them. Tiny, inconspicuous flowers in axillary clusters are unisexual, the taminate (male) flowers with 4 sepals, no petals, 4 stamens; pistillate (female) flowers with 4 unequal sepals, no petals, 1 superior ovary. The fruit is an achene enclosed by the persistent sepals. Most members of this family grow in rich moist soils. The edible, nutritious, greens lose their sting when boiled or dried and pulverized (Clarke). Verbenaceae: Vervains. Most closely related to the mint family with opposite leaves and  square stems. Well known members include Lantana, and Teak (Tectona grandis), an important tropical hardwood (Clarke).

Western Nettle (Annual Stinging Nettle), Hesperocnide tenella

Hoary (Stinging) Nettle,
Urtica dioica ssp. holosericea

* Dwarf Nettle,
Urtica urens

Turkey-tangle Frog-fruit, Phyla nodiflora var. nodiflora

Western Verbena, Verbena lasiostachys var. lasiostachys
Valerianaceae: Valerians Violaceae: Violets (Not shown here yet, Viola sheltonii is in upper Silverado Cyn, Modjeska Peak and nw slopes of Santiago Peak. It has lobed leaves). Viscaceae: Mistletoes. This family consists of perennial hemi-parasites with inconspicuous flowers. Each parasite is selective of its host.  Foliage is thick, semi-succulent and usually evergreen.  Sustenance is derived from the host tree's xylem sap, water and minerals absorbed from its  roots, which the mistletoe, which has its own chlorophyll, then uses to convert sunlight to carbohydrates by  photosynthesis.
 
California Golden Violet (Johnny-Jump-up), Viola pedunculata
Oak Yellow Violet, Viola purpurea ssp. quercetorum
Hairy (Oak) Mistletoe, Phoradendron serotinum ssp. tomentosum

Big-leaf (Sycamore) Mistletoe, Phoradendron serotinum ssp. macrophyllum
Vitaceae: Grapes Zygophyllaceae: Caltrops      
         
Monocots
Agavaceae: Agaves. There are three groups in OC, two non-native Agaves, two Chlorogalums, and Hesperoyucca. Agavaceae are perennial,  from bulbs or rhizomes. Flowers are bisexual with 6 perianth parts (collective term for petals and sepals or tepals of a flower; from peri = around, anth =  anthers. Clarke), in two petal-like whorls.  There are 6 stamens often with wide, succulent filaments. Alismataceae:
Water plantains
 
Small-flowered Soap Plant, Chlorogalum parviflorum

Wavy-leaved Soap Plant, Chlorogalum pomeridianum

Chaparral Yucca,
Hesperoyucca whipplei
 
Alliaceae: Onions and relatives. Long-lived perennials that grow from a bulb, and may reproduce either by seed or bulb division which can lead to dense clonal clusters.  Leaves are basal with a typical onion smell when crushed; bulbs are edible.  There are 2-4 thin, dry bracts.  Flowers are in compact umbels on tall leafless stems (pedicels); 6 petal-like perianth parts with darker midvein; 6 stamens fused at the base; a 3-lobed superior ovary with a nectary beneath that produces copious nectar, hidden by the stamen bases. Each ovary lobe in the flower center has two ridges.

Red-skinned Onion,
Allium haematochiton

Early Onion, Allium praecox
     
  APONOGETONACEAE:
Cape pondweeds
ARACEAE: Arums Arecaceae: Palms Asphodelaceae
     
California Fan Palm,
Washingtonia filifera

* Onionweed,
Asphodelus fistulosus
COMMELINACEAE:
Spiderworts
CYMODOCEACEAE:
Manatee grasses
Cyperaceae: Sedges and rushes: Grass-like herbs with 3-sided, pithy, stems (not hollow as in grasses) that grow in marshy or moist areas.  Leaves are in basal whorls and can be keeled or cylindrical.   Inflorescences generally consist of a tight cone-like whorl near the tip of the flowering stem. Perianth parts are either absent or bristle-like.  Fruit is a single seed. HYDROCHARITACEAE:
Waterweeds
 
   
Southern (California) Bulrush, Schoenoplectus californicus
   
Iridaceae: Irises. Juncaceae: Rushes. In our area, the family is represented by only one genus, Juncus.  Rushes are mostly perennials with basal leaves vertical, hollow, cylindrical to flattened, on an erect stem, and with 3-merous, green to brown flowers.  They arise from rhizomes (clone-forming stems) in water or moist soil.  The flower produces a 3-parted fruit capsule. In rushes, the basic flower structure is nearly the same as in Liliaceae, but the reduced perianth parts (tepals) are very small and bract-like, occurring in  terminal, head-like clusters. (In Cyperaceae (sedges), flowers have no perianth parts, but instead have bracts.  Cyperaceae are intermediate in evolution beween rushes and grasses. In many cases,  non-flowering plants in Cyperaceae are virtually indistinguishable from those of Juncaceae, suggesting a close relationship, supported by recent molecular work).  (Clarke p. 36)

JUNCAGINACEAE:
Arrow grasses

LEMNACEAE:
Duckweeds


Blue-eyed Grass,
Sisyrinchium bellum

Spiny (Sharp-leaved) Rush,
Juncus acutus ssp. leopoldii

Baltic Rush,
Juncus balticus ssp. ater

Panicled Rush, Juncus phaeocephalus, var. paniculatus
 
Liliaceae: Lilies. Perennials growing from a membranous bulb or scaly rhizome. Our genera arise mainly from bulbs, have narrow leaves with parallel veins, flowers arranged in threes or sixes, superior ovary, capsular fruits with wind-dispersed seeds and large conspicuous flowers.  Many species are poisonous, especially to cats; the group includes widely grown ornamental plants (hyacinths, tulips, lilies). It is estimated that the family evolved 58 million years ago (Wikipedia). Calochortus is the most widely dispersed genus in the family, endemic to the Pacific coast of North America. California has 28  endemic species, with 6 species present in Orange County.   The genus includes Mariposa lilies, Globe lilies, and Fairy lanterns. Calochortus produce showy flowers on an erect stem that arises from a 2 cm. bulb in spring.  Unlike most other lilies,  3 wedge-shaped petals differ in color from their smaller lance-shaped sepals.   The insides of the petals are often hairy with nectaries near the base.  There are 6 filaments, often dilated at the base, anthers attached at the base, one style, three stigmas and a superior ovary.  The fruit is a 3-chambered capsule.  The bulbs of many species were eaten by Native Americans.

Catalina Mariposa Lily,
Calochortus catalinae

Splendid Mariposa Lily,
Calochortus splendens

Intermediate Weed's Mariposa Lily, Calochortus weedii var. intermedius

Weed's mariposa lily,
Calochortus weedii var. weedii

Plain Mariposa Lily (Shy Mariposa Lily), Calochortus invenustus

Chocolate Lily (Mission Bells), Fritillaria biflora

Humboldt Lily,
Lilium humboldtii ssp. ocellatum
     

Orchidaceae: Orchids: One of the two largest plant families (along with Asteraceae), with up to 25,000 currently accepted species, but most are tropical and only four species are native to our area, two uncommon and two very rare.  All orchids are herbaceous perennials that are often long-lived.  Most tropical forms grow nonparasitically on trees while temperate species including all California species are usually terrestrial.  In California native orchids, nutrition is derived from association of roots with fungi in non-green species, and from rhizomes or tubers with fleshy roots in green plants.  Flowers are on spikes, with each flower subtended by a bract.  Flowers are bisexual, rotating 180 degrees in bud and turning upside down. There are generally 3 petal-like sepals, one central, erect and two lateral; 3 petals, the lowest called the lip differs from the others; one stamen, fused with the style and stigma into a column.  Pollen confined to sacs (pollinia), not freely dispersed, but removed intact on the body of the pollinator; ovary inferior, stigma 3-lobed, under the column tip.  Fruit is a capsule, with numerous minute seeds (JM2).

Ruscaceae: Butcher's Brooms


Stream Orchid, Epipactis gigantea

Cooper's Rein Orchid,
Piperia cooperi

The most commonly encountered Rein Orchid in the County. This orchid grows under other plants so it is difficult to find. It grows in dry soils on hillsides in coastal sage scrub and oak woodlands in Limestone, Santiago, Silverado, Trabuco, and San Juan Canyons, also along San Juan Loop Trial and both ends of the San Juan Trail.  Peak flowering is in late April and early May.

Wood Rein Orchid,
Piperia elongata

Two Orange County populations: in upper Trabuco Canyon and a smaller one in Silverado Canyon.  It is in mixed coniferous forest under the shade of big-cone Douglas firs and California Bay Laurel. It blooms in May-July.

Thin Wood Rein Orchid,
Piperia leptopetala

Very rare and difficult to find.  It was found only once on a steep slope in Holy Jim Canyon at 2000 ft. in 1948.


Chaparral Nolina, Nolina cismontana
         
         
  POACEAE:
Grasses
PONTEDERIACEAE:
Pickerel weeds
POTAMOGETONACEAE:
Pondweeds
SCHEUCHZERIACEAE:
Scheuchzerias
Themidaceae.  Perennial herbs arising from a starchy corm, a new corm arising each year from the old one.  Leaves are linear, parallel-veined, often fleshy, forming a closed sheath at their base.  The inflorescence is umbel-like, (flat- or convex-topped, with all flower stalks attached to a central point (umbrella-like) rarely a single flower, at the apex of a leafless stem (scape). Flowers are bisexual. Perianth parts (sepals and petals) are undifferentiated ("tepals"), arranged in 2 whorls of 3.  Either 6 fertile stamens or 3, sometimes alternating with 3 staminodes (sterile or rudimentary stamens) inserted on tepals. Ovary superior and 3-chambered. Fruit a capsule (Wikipedia).  

Golden Stars (Common Goldenstar), Bloomeria crocea

Thread-leaved Brodiaea,
Brodiaea filifolia

Brodiaea terrestris

Blue Dicks, Dichelostemma capitatum ssp. capitatum
 
Typhaceae: Cattails. Tall monoecious perennial herbs from creeping rhizomes that grow deep in mud.  Cylindrical, jointless stems are submerged at the base. Leaf blades are C-shaped in cross section at the base, flat above, alternate, thick and spongy with large internal air cavities. Flowers are unisexual, wind pollinated, with over a thousand densely crowded on a terminal unbranched spike, the male (staminate) above, the sausage-like female (pistillate) below; there are no petals.   Staminate flowers mixed with papery scales (bracts) have 2-7 stamens on slender filaments; flowers wither once pollen is shed. Tiny fertile pistillate flowers on long, hairy stems have an ovary narrowed into a persistent style and narrow stigma; many modified pistils have an enlarged, terminal, sterile ovary and deciduous style (JM2). Fruits tightly compressed on spike, dry; when ripe, heads disintegrate into loose cottony fluff, the seeds fall free or becomes airborne.   The vegetation is an important food source for migratory ducks.  Rhizomes are edible with as much starch content as corn.  Evidence on grinding stones suggest these plants were eaten by humans in Europe as long as 30,000 years ago. The spread of Typha is an important part of the process of open water bodies being converted to vegetated marshland and eventually dry land.  Other uses.   ZANNICHELLIACEAE:
Horned pondweeds
ZOSTERACEAE:
Eel grasses

Southern Cattail, Typha domingensis

Broad-leaved Cat-tail, Typha latifolia
     

Non-vascular Plants of Orange County, California, by Peter Bryant
Some Common Plants of Upper Newport Bay, by Don Millar
The Vascular Plants of Upper Newport Bay, Orange County, California, By Robert De Ruff

CNPS Orange County Chapter Plant Lists
A Manual of California Vegetation
Snapshots of California Vegetation
California Native Plant Society
CNPS Orange County Chapter Main Page

California Poppies

Encelia (Asteraceae) and its relatives

Coast Live Oak
CalFlora
Plants for a California butterfly garden
Las Pilitas Nursery South, 8331 Nelson Way, Escondido, 92026 760-7495930
Las Pilitas
Nursery, 3232 Las Pilitas Rd. Santa Margarita, 93453 805-4385992

1000 California Native Plants

Lathrop, E.W. & R.F. Thorne. 1978. A Flora of the Santa Ana  Mountains, California. An annotated list of the vascular plants and the plant communities of the Santa Rosa Plateau, Santa Ana Mountains.  Aliso 9(2):197-278. [Available from Rancho Santa Ana Botanic Garden]

Roberts, F.M., Jr. 1998. A Checklist of the Vascular Plants of Orange County, California, second edition. F.M. Roberts Publications,  Encinitas, CA. Available from the OC chapter of the California Native Plant Society, which meets in the Duck Club building next door to Audubon House.

Roberts, F.M., Jr., S.D. White, A.C. Sanders, D.E. Bramlett, & S.  Boyd. 2004. The Vascular Plants of Western Riverside County, California: An Annotated Checklist. F.M. Roberts Publications, San  Luis Rey, CA. [The OC/Riverside County line runs along the ridgeline  of the Santa Ana Mountains, so one needs this reference for the  northeast side of the range. Available from the OC chapter of the California Native Plant Society.

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