Endangered
Stems usually solitary, mostly 1-2 cm across by 1-2 cm tall, hemispherical but appearing conical due to spination; tubercles solitary with groove on upper side; spines 30-75 per areole, slender and bristle-like, spreading, to 10(22) mm long; flowers ...
Stems solitary, growing in clumps, or commonly branched to form small dense clusters, the individual stems mostly 2-4 cm thick and to 15 cm long; tubercles on mature stems with upper surface bearing a groove; spines with a yellowish cast often reddis...
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...
Stems growing in clumps, or commonly branched to form small dense clusters, the individual stems mostly 1-2 cm thick and to 10 cm tall; tubercles on mature stems with upper surface grooved; spines slender, spreading to erect in any one areole, mostly...
Stems solitary, growing in clumps, or commonly branched to form small dense clusters, the individual stems mostly 2-4 cm thick and to 15 cm long; tubercles on mature stems with upper surface bearing a groove; spines about 20-50 per areole, majority s...
Rhizomatous, perennial herb, the rhizomes slender and unbranched; stems several, unbranched, clustered, somewhat woody at the base, 10-20 cm tall; leaves opposite, 8-15 mm long, 2.5-5.0 mm wide, sessile, oblong-lanceolate, tip rounded to acute, margi...
Annual, 1-2 m tall, branched above, stem glabrous to hispid; leaves opposite below, alternate above, up to 17.5 cm long by 8.5 cm wide, lanceolate with 3 prominent veins, base tapering to a short petiole, margins entire except for a few prominent tee...
Stems pinkish-red, pinkish-yellow, or pinkish white; flowers with sepals pale creamy yellow or dull pale pinkish-purple with pinkish-red, pinkish-brown or pinkish-purple veins, connivent or spreading apically; dorsal sepal lanceolate to oblong, 15-18...
Perennial, rhizomatous, myco-heterotrophic herb lacking chlorophyll; stems up to 55 cm high, erect, cream to pale pink in color, with 4 to 6 reduced leaves or bracts that are well spread along the stem below the inflorescence; flowers 13 to 19, each ...
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...