Herbs perennial, from rhizome, glabrous. Stems angled to nar­rowly winged, sprawling, often branched mid stem (at or just proximal to flowering nodes), 3–10 dm. Leaves 6–10 cm; tendrils well developed; stipules lanceolate to linear, 10–20 × 1–8 mm, much smaller than leaflets; leaflets 8–12, usually paired, sometimes scattered, ovate to lanceolate, 20–45 × 15–25 mm, glabrous. Inflorescences 7–15-flowered, 5–15 cm. Flowers 12–14 mm; calyx lobes unequal, lateral lobes linear-triangular, shorter than or equal to tube; corolla cream-white, banner erect, blade longer than claw, wings equal to keel; ovary glabrous. Legumes 40–70 × 4–9 mm. 2n = 14.

Phenology: Flowering Apr–Jun.
Habitat: Roadside fencerows, stream banks, grasslands, open oak woodlands.
Elevation: 50–500 m.

Distribution

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Oreg., Wash.

Discussion

Lathyrus holochlorus is restricted to the Willamette Valley of western Oregon and at least one site in southwestern Washington.

Selected References

None.

Lower Taxa

None.