Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

FABACEAE

LEGUME FAMILY

Annual to tree
Leaves generally compound, alternate, stipuled; leaflets generally entire
Inflorescence: generally raceme, spike, umbel or head; flowers sometime 1–2 in axils
Flowers generally bisexual, generally bilateral; hypanthium generally flat or cup-like; sepals generally 5, fused; petals generally 5, free, or the 2 lower ± fused; stamens 1–many, often 10 with 9 filaments at least partly fused, 1 (uppermost) free; pistil 1, ovary superior, generally 1-chambered, ovules 1–many, style, stigma 1
Fruit: legume, sometimes including a stalk-like base above receptacle, dehiscent, or indehiscent and breaking into 1-seeded segments, or indehiscent, 1-seeded, and achene-like
Seeds 1–several, often ± reniform, generally hard, smooth
Genera in family: ± 650 genera, 18,000 species: worldwide; with grasses, requisite in agriculture and most natural ecosystems. Many cultivated, most importantly Arachis , peanut; Glycine , soybean; Phaseolus , beans; Medicago ; Trifolium ; and many orns
Reference: [Polhill & Raven (eds) 1981 Advances in legume systematics; Allen & Allen 1981 Leguminosae]
Family description and key to genera by Duane Isely.

LATHYRUS

WILD PEA

Duane Isely

Annual or perennial herb, unarmed, glabrous or hairy, rarely glandular, generally rhizomed
Stem sprawling, climbing, or erect; stem angled, flanged, or winged
Leaves even-1-pinnate; stipules persistent, upper lobe > lower; main axis ending as a tendril or short bristle; leaflets 0–16, ± opposite or alternate, linear to widely ovate
Inflorescence: raceme, generally axillary, 1–many-flowered
Flower: upper calyx lobes generally < and wider than lower; corolla 8–30 mm, pink-purple or pale, sometimes white or yellow; 9 filaments fused, 1 free; style flat, finely hairy on concave side
Fruit dehiscent, oblong, ± flat
Species in genus: ± 150 species: temp North America, Eurasia
Etymology: (Ancient Greek name)
Reference: [Broich 1987 Syst Bot 12:139–153]
Some species variable, intergrading with others; some hybridization probable. Seeds of most alien species. TOXIC to humans (especially young males) and livestock (especially horses).

Native

L. delnorticus C.L. Hitchc.

DEL NORTE PEA

Perennial, glabrous
Stem flanged or winged
Leaf: stipules small but wide, toothed; leaflets 10–16, generally subopposite, 3–5 cm, elliptic or lanceolate; tendril branched, coiled
Inflorescence 8–10-flowered, ± dense
Flower: calyx tube generally < lower lobes; corolla 10–15 mm, white, generally lavender-striate, fading yellow-tan
Fruit glabrous
Chromosomes: 2n=14
Ecology: UNCOMMON. Streambanks, serpentine
Elevation: 250–700 m.
Bioregional distribution: nw Klamath Ranges (Del Norte, w Siskiyou cos.)
Distribution outside California: Oregon
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for LATHYRUS%20delnorticus being generated
 


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