Lathyrus nevadensis |
Lathyrus holochlorus |
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purple peavine, Sierra Nevada pea, Sierra Nevada sweet pea, Sierra pea, Sierra peavine |
thin-leaf pea, thin-leaf vetchling |
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Habit | Herbs perennial, from rhizome, pubescent except glabrous on legumes and leaflets adaxially. | Herbs perennial, from rhizome, glabrous. | ||||||||
Stems | angled, erect, sprawling, or climbing, basally branched 0–several times, 1–6 dm. |
angled to narrowly winged, sprawling, often branched mid stem (at or just proximal to flowering nodes), 3–10 dm. |
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Leaves | 2–10 cm; tendrils mucronate (less than 1 cm) to well developed; stipules linear, 5–25 × 1–8 mm, much smaller than leaflets; leaflets 4–12, usually scattered, blades broadly ovate to lanceolate or linear, (17–)20–110 × 2–30(–37) mm, surfaces usually glabrous, rarely finely pubescent. |
6–10 cm; tendrils well developed; stipules lanceolate to linear, 10–20 × 1–8 mm, much smaller than leaflets; leaflets 8–12, usually paired, sometimes scattered, ovate to lanceolate, 20–45 × 15–25 mm, glabrous. |
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Inflorescences | 2–10-flowered, 3–15 cm. |
7–15-flowered, 5–15 cm. |
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Flowers | 12–22 mm; calyx lobes unequal, lateral lobes deltate, usually shorter than tube; corolla blue-purple to pink-purple or white, banner erect, blade longer than claw, wings equal to keel; ovary glabrous. |
12–14 mm; calyx lobes unequal, lateral lobes linear-triangular, shorter than or equal to tube; corolla cream-white, banner erect, blade longer than claw, wings equal to keel; ovary glabrous. |
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Legumes | 20–30(–45) × 5–10 mm. |
40–70 × 4–9 mm. |
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2n | = 14. |
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Lathyrus nevadensis |
Lathyrus holochlorus |
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Phenology | Flowering Apr–Jun. | |||||||||
Habitat | Roadside fencerows, stream banks, grasslands, open oak woodlands. | |||||||||
Elevation | 50–500 m. (200–1600 ft.) | |||||||||
Distribution |
w North America
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OR; WA
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Discussion | Varieties 3 (3 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Lathyrus holochlorus is restricted to the Willamette Valley of western Oregon and at least one site in southwestern Washington. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 11. | FNA vol. 11. | ||||||||
Parent taxa | Fabaceae > subfam. Faboideae > Lathyrus | Fabaceae > subfam. Faboideae > Lathyrus | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | L. ochropetalus subsp. holochlorus | |||||||||
Name authority | S. Watson: Proc. Amer. Acad. Arts 11: 133. (1876) | (Piper) C. L. Hitchcock: Revis. N. Amer. Lathyrus, 31. (1952) | ||||||||
Web links |