Lathyrus graminifolius |
Lathyrus pauciflorus |
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grass-leaf pea |
few-flower pea, few-flower pea-vine, few-flower vetchling |
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Habit | Herbs perennial, from rhizome or woody rootstock, glabrous. | Herbs perennial, from rhizome or thickened rootstock, glabrous. | ||||
Stems | angled, sprawling or climbing, sometimes branched at flowering nodes, 2–6 dm. |
angled, erect, sprawling, or climbing, basally branched 1–3 times, 3–8 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. |
6–9 cm; tendrils well developed; stipules ovate to lanceolate, 15–25 × 5–11 mm, much smaller than leaflets; leafets 6–10, scattered, blades lanceolate to linear or ovate, 20–80 × 2–35 mm, surfaces glabrous. |
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Inflorescences | 5–8-flowered, 10–18 cm. |
4–13-flowered, 5–18 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. |
12–20 mm; calyx lobes unequal, lateral lobes deltate, shorter than tube; corolla pale blue-lavender to purple, banner erect, blade longer than claw, wings longer than keel, (by 1–4 mm); ovary glabrous. |
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Legumes | 30–50 × 4–8 mm. |
30–50 × 5–10 mm. |
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2n | = 14. |
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Lathyrus graminifolius |
Lathyrus pauciflorus |
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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) | Fernald: Bot. Gaz. 19: 335. (1894) | ||||
Web links |