Lathyrus eucosmus |
Lathyrus brachycalyx |
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bush vetchling, seemly pea |
Bonneville pea, Bonneville peavine, Bonneville vetchling, Rydberg's peavine |
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Habit | Herbs perennial, from rhizome, glabrous or puberulent. | Herbs perennial, from rhizome, glabrous or villous. | ||||
Stems | angled, erect, basally branched 0–2 times, 2–5 dm. |
angled, erect, sprawling, or climbing, basally branched 0–3 times, 1–5 dm. |
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Leaves | 2–4 cm; tendrils simple or branched, sometimes prehensile; stipules linear, 5–15 × 1–2 mm, much smaller than leaflets; leaflets 6 or 8, scattered, blades ovate to lanceolate, 15–45 × 4–10 mm, surfaces glabrous throughout or puberulent abaxially. |
2–9 cm; tendrils usually well developed, sometimes reduced to a single bristle; stipules lanceolate, 5–12 × 1–3 mm, much smaller than leaflets; leaflets 6–12, scattered, blades elliptic to narrowly so, 8–70 × 3–8 mm, surfaces glabrous or villous. |
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Inflorescences | 2–4-flowered, 7–12 cm. |
2–5-flowered, 5–15 cm. |
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Flowers | 18–20 mm; calyx lobes unequal, lateral lobes deltate, shorter than tube; corolla blue-purple, banner erect, blade longer than claw, wings equal to keel (held above keel); ovary glabrous. |
13–20 mm; calyx lobes unequal, lateral lobes deltate, shorter than tube; corolla pinkish to deep blue-purple, banner erect, blade nearly 2 times as long as claw, wings equal to keel; ovary glabrous. |
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Legumes | 40–50 × 8–10 mm, short-stipitate. |
30–40 × 6–8 mm. |
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2n | = 14. |
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Lathyrus eucosmus |
Lathyrus brachycalyx |
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Phenology | Flowering Apr–Jun. | |||||
Habitat | Dry soils in washes, pinyon-juniper woodlands, oak-brush, ponderosa pine forests, open prairies, grasslands. | |||||
Elevation | 1200–2500 m. (3900–8200 ft.) | |||||
Distribution |
AZ; CO; NM; TX; UT; WY; Mexico (Coahuila)
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w United States
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Discussion | Lathyrus eucosmus is known from the northern two-thirds of Arizona northward to southeastern Utah, and eastward in southeastern Wyoming, Colorado, New Mexico, and Texas to the edge of the Great Plains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). (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. brachycalyx subsp. eucosmus, L. brachycalyx var. eucosmus | |||||
Name authority | Butters & H. St. John: Rhodora 19: 160. (1917) | Rydberg: Bull. Torrey Bot. Club 34: 425. (1907) | ||||
Web links |