Lathyrus laetivirens |
Lathyrus eucosmus |
|
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aspen pea, aspen peavine, aspen vetchling, plateau peavine, plateau vetchling |
bush vetchling, seemly pea |
|
Habit | Herbs perennial, from rhizome, glabrous. | Herbs perennial, from rhizome, glabrous or puberulent. |
Stems | angled, sprawling to erect, basally branched 0–3 times, 2–8 dm. |
angled, erect, basally branched 0–2 times, 2–5 dm. |
Leaves | 3–8 cm; tendrils well developed, often branched; stipules lanceolate, 8–12 × 2–5 mm, much smaller than leaflets; leaflets 6–10, usually paired, blades ovate, 20–40 × 10–20 mm, surfaces glabrous. |
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. |
Inflorescences | 2–5-flowered, 4–7 cm. |
2–4-flowered, 7–12 cm. |
Flowers | 15–20 mm; calyx lobes unequal, lateral lobes deltate, shorter than tube; corolla white to slightly pink or lavender, banner erect, blade longer than claw, wings equal to keel; ovary glabrous. |
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. |
Legumes | 30–50 × 5–15 mm. |
40–50 × 8–10 mm, short-stipitate. |
2n | = 14. |
|
Lathyrus laetivirens |
Lathyrus eucosmus |
|
Phenology | Flowering Apr–Jul. | Flowering Apr–Jun. |
Habitat | Flats, hillsides, sagebrush communities, pinyon-juniper, oak, pine, aspen and Douglas-fir forests. | Dry soils in washes, pinyon-juniper woodlands, oak-brush, ponderosa pine forests, open prairies, grasslands. |
Elevation | 1200–3200 m. (3900–10500 ft.) | 1200–2500 m. (3900–8200 ft.) |
Distribution |
AZ; CO; NM; NV; UT
|
AZ; CO; NM; TX; UT; WY; Mexico (Coahuila)
|
Discussion | C. L. Hitchcock (1952), S. L. Welsh et al. (1987), and D. Isely (1998) placed Lathyrus laetivirens within the L. lanszwertii complex, whereas R. C. Barneby (1989) treated it as a separate species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Lathyrus | Fabaceae > subfam. Faboideae > Lathyrus |
Sibling taxa | ||
Synonyms | L. lanszwertii var. laetivirens, L. leucanthus var. laetivirens | L. brachycalyx subsp. eucosmus, L. brachycalyx var. eucosmus |
Name authority | Greene ex Rydberg: Fl. Colorado, 217. (1906) | Butters & H. St. John: Rhodora 19: 160. (1917) |
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