Lathyrus laetivirens |
Lathyrus sulphureus |
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aspen pea, aspen peavine, aspen vetchling, plateau peavine, plateau vetchling |
Brewer's sweet or snub or sulfur pea, Brewer's sweet pea, snub pea, sulfur pea, sulpher pea, sulphur pea |
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Habit | Herbs perennial, from rhizome, glabrous. | Herbs perennial, from rhizome, usually glabrous, rarely pubescent. | ||||
Stems | angled, sprawling to erect, basally branched 0–3 times, 2–8 dm. |
angled, climbing, basally branched 0–3 times, 5–15 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. |
9–12 cm; tendrils well developed; stipules lanceolate, 15–25 × 4–10 mm, sometimes equal to distal leaflets; leaflets 6–12, scattered, blades ovate to lanceolate, 25–50 × 10–20 mm, surfaces glabrous or pubescent. |
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Inflorescences | 2–5-flowered, 4–7 cm. |
9–15-flowered, 6–10 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. |
11–13 mm; calyx lobes unequal, lateral lobes deltate to lanceolate, shorter than tube; corolla orange to yellow-cream, banner erect, blade shorter than claw, wings equal to keel; ovary glabrous. |
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Legumes | 30–50 × 5–15 mm. |
40–70 × 4–6 mm. |
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Lathyrus laetivirens |
Lathyrus sulphureus |
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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 United States
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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 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. lanszwertii var. laetivirens, L. leucanthus var. laetivirens | |||||
Name authority | Greene ex Rydberg: Fl. Colorado, 217. (1906) | W. H. Brewer ex A. Gray: Proc. Amer. Acad. Arts 7: 399. (1868) | ||||
Web links |