Lathyrus eucosmus |
Lathyrus decaphyllus |
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bush vetchling, seemly pea |
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Habit | Herbs perennial, from rhizome, glabrous or puberulent. | Herbs perennial, from rhizome. | ||||
Stems | angled, erect, basally branched 0–2 times, 2–5 dm. |
angled, erect or sprawling, basally branched 0–2 times, 1.5–3 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. |
1–4 cm; tendrils bristlelike, usually less than 1 cm; stipules linear to lanceolate, 10–30 × 1–5 mm, nearly equal to leaflets; leaflets 8–12, often paired, blades lanceolate to linear, 10–35 × 1–5 mm, surfaces glabrous or pubescent. |
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Inflorescences | 2–4-flowered, 7–12 cm. |
2–6-flowered, 4–11 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. |
16–22 mm; calyx lobes subequal, lateral lobes deltate, shorter than tube; corolla usually violet to magenta, sometimes white, banner erect, blade longer than claw, wings 4–5 mm longer than keel; ovary glabrous. |
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Legumes | 40–50 × 8–10 mm, short-stipitate. |
35–50 × 8–12 mm, stipitate. |
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2n | = 14. |
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Lathyrus eucosmus |
Lathyrus decaphyllus |
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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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wc 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) | Pursh: Fl. Amer. Sept. 2: 471. (1813) | ||||
Web links |