Lathyrus laetivirens |
Lathyrus holochlorus |
|
---|---|---|
aspen pea, aspen peavine, aspen vetchling, plateau peavine, plateau vetchling |
thin-leaf pea, thin-leaf vetchling |
|
Habit | Herbs perennial, from rhizome, glabrous. | Herbs perennial, from rhizome, glabrous. |
Stems | angled, sprawling to erect, basally branched 0–3 times, 2–8 dm. |
angled to narrowly winged, sprawling, often branched mid stem (at or just proximal to flowering nodes), 3–10 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. |
6–10 cm; tendrils well developed; stipules lanceolate to linear, 10–20 × 1–8 mm, much smaller than leaflets; leaflets 8–12, usually paired, sometimes scattered, ovate to lanceolate, 20–45 × 15–25 mm, glabrous. |
Inflorescences | 2–5-flowered, 4–7 cm. |
7–15-flowered, 5–15 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. |
12–14 mm; calyx lobes unequal, lateral lobes linear-triangular, shorter than or equal to tube; corolla cream-white, banner erect, blade longer than claw, wings equal to keel; ovary glabrous. |
Legumes | 30–50 × 5–15 mm. |
40–70 × 4–9 mm. |
2n | = 14. |
|
Lathyrus laetivirens |
Lathyrus holochlorus |
|
Phenology | Flowering Apr–Jul. | Flowering Apr–Jun. |
Habitat | Flats, hillsides, sagebrush communities, pinyon-juniper, oak, pine, aspen and Douglas-fir forests. | Roadside fencerows, stream banks, grasslands, open oak woodlands. |
Elevation | 1200–3200 m. (3900–10500 ft.) | 50–500 m. (200–1600 ft.) |
Distribution |
AZ; CO; NM; NV; UT
|
OR; WA
|
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 holochlorus is restricted to the Willamette Valley of western Oregon and at least one site in southwestern 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 | L. ochropetalus subsp. holochlorus |
Name authority | Greene ex Rydberg: Fl. Colorado, 217. (1906) | (Piper) C. L. Hitchcock: Revis. N. Amer. Lathyrus, 31. (1952) |
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