Lathyrus graminifolius |
Lathyrus brachycalyx |
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grass-leaf pea |
Bonneville pea, Bonneville peavine, Bonneville vetchling, Rydberg's peavine |
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Habit | Herbs perennial, from rhizome or woody rootstock, glabrous. | Herbs perennial, from rhizome, glabrous or villous. | ||||
Stems | angled, sprawling or climbing, sometimes branched at flowering nodes, 2–6 dm. |
angled, erect, sprawling, or climbing, basally branched 0–3 times, 1–5 dm. |
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Leaves | 5–9 cm; tendrils usually well developed; stipules lanceolate to linear, 8–12 × 1–5 mm, much smaller than leaflets; leaflets 4–8, scattered, blades usually linear, rarely lanceolate, 30–80 × 1–20 mm, surfaces glabrous. |
2–9 cm; tendrils usually well developed, sometimes reduced to a single bristle; stipules lanceolate, 5–12 × 1–3 mm, much smaller than leaflets; leaflets 6–12, scattered, blades elliptic to narrowly so, 8–70 × 3–8 mm, surfaces glabrous or villous. |
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Inflorescences | 5–8-flowered, 10–18 cm. |
2–5-flowered, 5–15 cm. |
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Flowers | 8–15 mm; calyx lobes subequal, lateral lobes deltate, shorter than tube; corolla white to blue-orchid, banner erect, blade equal to claw, wings equal to keel; ovary glabrous. |
13–20 mm; calyx lobes unequal, lateral lobes deltate, shorter than tube; corolla pinkish to deep blue-purple, banner erect, blade nearly 2 times as long as claw, wings equal to keel; ovary glabrous. |
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Legumes | 30–50 × 4–8 mm. |
30–40 × 6–8 mm. |
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2n | = 14. |
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Lathyrus graminifolius |
Lathyrus brachycalyx |
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Phenology | Flowering Apr–Aug. | |||||
Habitat | Slopes of ponderosa pine, mixed conifer, spruce-fir and oak-juniper forests. | |||||
Elevation | 1000–2800 m. (3300–9200 ft.) | |||||
Distribution |
AZ; NM; TX; Mexico (Chihuahua, Sonora)
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w United States
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Discussion | Lathyrus graminifolius is known from the eastern half of Arizona to the western two-thirds of New Mexico and in trans-Pecos Texas. (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. palustris var. graminifolius | |||||
Name authority | (S. Watson) T. G. White: Bull. Torrey Bot. Club 21: 454. (1894) | Rydberg: Bull. Torrey Bot. Club 34: 425. (1907) | ||||
Web links |