Distribution: Known historically from Klickitat County in Washington, but now thought to be extirpated; Klickitat County, Washington south to Wheeler and Grant counties in Oregon.
Habitat: Gravel bars, alluvial slopes, and in thin gravelly soil overlying basaltic rock.
Conservation Status: Presumed extirpated in Washington (WANHP)
Prostrate annual or biennial from a stout taproot, nearly glabrous, the stems numerous, 1-4 dm. long.
Leaves alternate, pinnate, 2-4 cm. long; stipules 1-2 mm. long, not connate; leaflets 9-13, obovate, 4-12 mm. long.
Inflorescence of 5- to 20-flowered compact racemes; peduncles about equaling the leaves; flowers 4-8 mm. long, mostly white, but the banner purplish-veined and the keel purplish-tipped; calyx 2-3 mm. long, the 5 teeth purplish, linear, shorter than the tube.
Pods sessile, linear-oblong in outline, strongly curved, membranous, 1.5-2 cm. long and 3-4 mm thick, cordate and 2-celled in cross section due to the complete intrusion of the lower suture.