Herbs perennial, from rhizome or woody rootstock, glabrous. Stems angled, sprawling or climbing, sometimes branched at flowering nodes, 2–6 dm. 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. Inflorescences 5–8-flowered, 10–18 cm. 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. Legumes 30–50 × 4–8 mm. 2n = 14.

Phenology: Flowering Apr–Aug.
Habitat: Slopes of ponderosa pine, mixed conifer, spruce-fir and oak-juniper forests.
Elevation: 1000–2800 m.

Distribution

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Ariz., N.Mex., Tex., Mexico (Chihuahua, Sonora).

Discussion

Lathyrus graminifolius is known from the eastern half of Arizona to the western two-thirds of New Mexico and in trans-Pecos Texas.

Selected References

None.

Lower Taxa

None.