Stems mostly solitary or sometimes up to 5 in a clump, globose to obovoid, the individual stems mostly 3-5 cm thick and 4-10 cm tall; tubercles on mature stems with upper surface grooved; spines about 50-60 per areole, spreading, typically white, of...
Stems forming small dense clusters, the individual stems mostly 1-2 cm thick and to 8 cm tall; tubercles on mature stems with upper surface grooved; spines about 30-90 per areole, typically white often brown at tip, fading to gray, slender and bristl...
Perennials, less commonly biennial; leaves ovate-lanceolate, slightly coriaceous, coarsely serrate with gland-tipped teeth; achenes monomorphic. Flowering June-September.
An herbaceous perennial forming dense tufts from woody rootstocks; leaves opposite, coriaceous, sessile, lanceolate-elliptic, entire, tapered to a conspicuous apiculate apex, 7-15 mm long, 1.5-3.5 mm wide; flowers solitary or in clusters of 2-3 in up...
Plant saprophytic; stems reddish-purple, leafless except for a few widely spaced bracts, glabrous, up to 30 cm tall; inflorescence loosely to densely flowered, with up to 20 small, shiny flowers; sepals and petals pinkish-brown, parallel veins darker...
Herbaceous saprophytic perennial; stems 40-50 cm tall, pale pink to rose to tan, leafless except for a few widely spaced bracts; inflorescence a raceme with 10-20 rose-tan to whitish flowers; sepals and petals pale rose-tan with light veining, free a...
Suffrutescent perennial, 8-15 cm tall; leaves sessile, linear to oblanceolate, strigillose, mostly 10-15 mm long, 1.5-4 mm wide, acute to rounded at the apex, margins flat; flowers solitary, sessile in the leaf axils, bractlets linear-subulate to lin...
Tufted perennial from a woody base; stems to 30 cm tall; leaves opposite in lower portion, becoming alternate above, the blades 15-25 mm long, 8-20mm wide, thickened and leathery, broadly triangular to kidney-shaped, somewhat toothed to very shallowl...
Long-lived perennial, suffrutescent from a woody branching base, sometimes sprouting shoots from thick, lateral roots; stems up to 25 cm tall, puberulent or glabrescent at the base and glabrous for at least the upper two-thirds; leaves linear to line...
Rhizomatous perennial; stems much branched above, wiry, 4-30 cm tall, usually growing in isolated clumps and seldom forming dense stands; blades short, less than 3 cm long, strongly involute; inflorescence a narrow contracted panicle, 1-5 cm long, us...