Lathyrus laetivirens |
Lathyrus lanszwertii |
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aspen pea, aspen peavine, aspen vetchling, plateau peavine, plateau vetchling |
aspen peavine, lanszwert's pea, lanszwert's vetchling, Nevada pea, Nevada peavine, Nevada sweet pea, pinewood peavine, Rocky Mountain sweetpea, thick-leaf pea, thick-leaf peavine |
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Habit | Herbs perennial, from rhizome, glabrous. | Herbs perennial, from rhizome, glabrous or sparsely pubescent. | ||||||||||||||||
Stems | angled, sprawling to erect, basally branched 0–3 times, 2–8 dm. |
angled, erect, sprawling, or climbing, basally branched 0–4 times, 1–8 dm. |
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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. |
(0.5–)1–8 cm; tendrils mucronate to well developed; stipules linear to lanceolate, 5–25 × 1–6 mm, much smaller than leaflets; leaflets 2–10, scattered, blades lanceolate or linear, 20–70 × 2–20 mm, surfaces glabrous or sparsely pubescent. |
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Inflorescences | 2–5-flowered, 4–7 cm. |
2–6-flowered, 2–10 cm. |
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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. |
7–15 mm; calyx lobes unequal, lateral lobes deltate, shorter than tube; corolla white or blue-purple, banner erect, blade equal to claw, wings equal to keel; ovary glabrous. |
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Legumes | 30–50 × 5–15 mm. |
25–45 × 6–10 mm. |
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Lathyrus laetivirens |
Lathyrus lanszwertii |
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Phenology | Flowering Apr–Jul. | |||||||||||||||||
Habitat | Flats, hillsides, sagebrush communities, pinyon-juniper, oak, pine, aspen and Douglas-fir forests. | |||||||||||||||||
Elevation | 1200–3200 m. (3900–10500 ft.) | |||||||||||||||||
Distribution |
AZ; CO; NM; NV; UT
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w North America
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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.) |
Varieties 5 (5 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. lanszwertii var. laetivirens, L. leucanthus var. laetivirens | |||||||||||||||||
Name authority | Greene ex Rydberg: Fl. Colorado, 217. (1906) | Kellogg: Proc. Calif. Acad. Sci. 2: 150, fig. 44. (1863) | ||||||||||||||||
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