Dwarf, acaulescent, perennial herb from a well-developed, short, but knotty caudex on a simple taproot; leaves 3-11 cm long, pinnately compound with 5-9 pairs of leaflets, each leaflet grayish pubescent below and nearly glabrous on the upper surface;...
Perennial; stems erect or ascending, 20-40 cm long; herbage green to gray-green; leaves pinnately compound, 5-15 cm long; leaflets 19-27, 2-4 cm long, nearly glabrous above; flowers ochroleucus (yellow-white), in dense 35-60-flowered racemes; calyx d...
Rhizomatous perennial from subterranean crown; stems several, to 5 dm long, decumbent and radiating, branching from lower nodes, forming broad, depressed clumps; herbage greenish-gray; lower stipules connate; leaves 2.5-10 cm long; leaflets numerous,...
Densely tufted and matted perennial from an intricately branching subsurface caudex; above ground stems absent or less than 2 cm long; leaves crowded, silvery-canescent with mostly appressed dolabriform hairs, pinnately 5-9 foliolate, to 3 cm long, t...
Matted perennial, forming low cushions up to 30 cm across; stems absent or less than 2 cm; herbage strigose with dolabriform hairs; leaves pinnately compound, to 8 cm long, with 5-7 narrow leaflets; flowers pea-like, solitary on each peduncle, nestle...
Erect perennial herbs, from ovoid bulbs, stems slender, usually one per bulb, 2-6 dm tall, bearing a few long, narrow leaves and 1-3 flowers at the apex; flowers 3-merous, large, bell-shaped, erect; sepals lanceolate, 2-3 cm long; petals obovate, pal...
Perennial, multi-stemmed and branching herb or sub-shrub to 6 dm tall; stem hairs stiffly spreading or bent downward; leaves narrow to linear-lanceolate, devoid of teeth, rough to the touch; inflorescence short, few-flowered, soft-hairy; floral bract...
Twining, tangled, yellow threadlike annual with stems 0.5 mm or less in diameter; inflorescence a glomerule of subsessile flowers on glabrous pedicels; flowers 5-merous, 2.1-4 mm long, slightly fleshy; calyx campanulate-cupulate, about 1/2 the coroll...
Plants shrubby, much-branched to about 0.8 m in height and about 2 meters across; main stems with lateral "joints" primarily in whorls at ends of each year's growth, some of these elongating into secondary main stems; stems 1.5-2 cm thick; lateral jo...
