Lathyrus laetivirens |
Lathyrus torreyi |
|
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aspen pea, aspen peavine, aspen vetchling, plateau peavine, plateau vetchling |
redwood pea, Torrey's pea, Torrey's peavine |
|
Habit | Herbs perennial, from rhizome, glabrous. | Herbs perennial, from rhizome, finely villous. |
Stems | angled, sprawling to erect, basally branched 0–3 times, 2–8 dm. |
angled, erect to sprawling, basally branched 0–3 times, 1–4 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. |
2–7 cm; tendrils absent or mucronate; stipules lanceolate, 7–12 × 2–5 mm, much smaller than leaflets; leaflets 8–16, scattered, blades ovate to lanceolate, 5–15 × 3–10 mm, surfaces villous. |
Inflorescences | 2–5-flowered, 4–7 cm. |
1- or 2-flowered, 0.5–3 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. |
8–12 mm; calyx lobes unequal, lateral lobes linear-triangular, longer than tube; corolla blue-purple, banner erect, blade equal to claw, wings longer than keel; ovary densely pubescent. |
Legumes | 30–50 × 5–15 mm. |
15–20 × 4–5 mm. |
2n | = 14. |
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Lathyrus laetivirens |
Lathyrus torreyi |
|
Phenology | Flowering Apr–Jul. | Flowering Apr–Jul. |
Habitat | Flats, hillsides, sagebrush communities, pinyon-juniper, oak, pine, aspen and Douglas-fir forests. | Open coniferous forests. |
Elevation | 1200–3200 m. (3900–10500 ft.) | 50–1500 m. (200–4900 ft.) |
Distribution |
AZ; CO; NM; NV; UT
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CA; OR; WA
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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 torreyi is known from in and west of the Cascade Range; it is very rare in Washington. (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 | |
Name authority | Greene ex Rydberg: Fl. Colorado, 217. (1906) | A. Gray: Proc. Amer. Acad. Arts 7: 337. (1868) |
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