Lathyrus graminifolius |
Lathyrus lanszwertii |
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grass-leaf pea |
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 or woody rootstock, glabrous. | Herbs perennial, from rhizome, glabrous or sparsely pubescent. | ||||||||||||||||
Stems | angled, sprawling or climbing, sometimes branched at flowering nodes, 2–6 dm. |
angled, erect, sprawling, or climbing, basally branched 0–4 times, 1–8 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. |
(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 | 5–8-flowered, 10–18 cm. |
2–6-flowered, 2–10 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. |
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 × 4–8 mm. |
25–45 × 6–10 mm. |
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2n | = 14. |
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Lathyrus graminifolius |
Lathyrus lanszwertii |
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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 North America
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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 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. palustris var. graminifolius | |||||||||||||||||
Name authority | (S. Watson) T. G. White: Bull. Torrey Bot. Club 21: 454. (1894) | Kellogg: Proc. Calif. Acad. Sci. 2: 150, fig. 44. (1863) | ||||||||||||||||
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