Lathyrus eucosmus |
Lathyrus jepsonii |
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bush vetchling, seemly pea |
delta tule pea, Jepson's pea, Jepson's sweet pea, tule pea |
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Habit | Herbs perennial, from rhizome, glabrous or puberulent. | Herbs perennial, from rhizome, glabrous or pubescent. | ||||
Stems | angled, erect, basally branched 0–2 times, 2–5 dm. |
winged, sprawling or climbing, basally branched 0–3 times, 4–25 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. |
5–15 cm; tendrils well developed; stipules narrowly lanceolate to linear, 10–25 × 2–6 mm, much smaller than leaflets; leaflets 8–12, scattered, blades lanceolate, 20–60 × 4–20 mm, surfaces glabrous or pubescent. |
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Inflorescences | 2–4-flowered, 7–12 cm. |
5–15-flowered, 6–16 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. |
14–17 mm; calyx lobes unequal, lateral lobes linear-triangular, equal to tube; corolla pale pink to rose-purple, banner erect, blade longer than claw, wings equal to keel; ovary glabrous. |
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Legumes | 40–50 × 8–10 mm, short-stipitate. |
50–90 × 6–9 mm. |
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2n | = 14. |
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Lathyrus eucosmus |
Lathyrus jepsonii |
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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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California
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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) | Greene: Pittonia 2: 158. (1890) — (as jepsoni) | ||||
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