Shortly rhizomatous perennial; stems sparsely hairy below, moderately to densely clothed in appressed hairs in upper parts, erect or ascending. Lvs moderately to densely hairy on both surfaces; petioles sparsely hairy, up to 100 mm long; leaflets elliptic to narrowly obovate, obtuse to emarginate, usually shortly mucronate, cuneate at base, ± entire or very finely serrate near apex, usually unmarked, 15-30-(50) mm long; lateral veins thin and ± straight to leaflet margin; petioles 1-2 mm long, ± equal; stipules broadly ovate, acuminate. Infls terminal, spicate, globose to ovoid, ± sessile, > subtending lvs; fls numerous, sessile; bracts 0, but stipules of subtending lvs partly enfolding young infl. Calyx moderately hairy, 10-veined, not inflated at fruiting; throat open, with a ring of hairs, thickened at fruiting; calyx teeth unequal, much < corolla, linear with slightly broader base, spreading at fruiting; upper teeth < tube; lowest tooth 2-3× as long as other 4, > tube; sinuses mostly acute. Corolla yellowish white, ultimately deciduous, c. 15 mm long. Pod glabrous, straight, < calyx, thickened at apex, 2-3 mm long, 1-seeded; seeds c. 2 mm long, with a blunt projection on one side.