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...
Acrocarpic moss to 3 mm tall and 2 mm wide, the stems not or sparingly branched; central strand absent; leaves distichous, equitant, consisting of 2 laminae that clasp the stem, arranged on edge to the stem and split at the base, to 1.5 mm long and 0...
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 herb; stems one or a few from a branching base, 2-5 dm tall, glabrous or sparsely pubescent in the inflorescence; leaves once or twice parted into narrowly linear lobes; inflorescence corymbose (flat-topped); involucre of flower heads 8-10 ...
Low, tufted perennial from a woody base; stems leafy, to about 10 cm long; leaves alternate or opposite, petioles very short, blades broadly rounded-triangular, thick, fleshy, 2-3 cm wide, margins toothed; flower heads golden-yellow, rayless, solitar...
Perennial herb from a woody base; stems single to many, 15-40 cm tall; leaves usually alternate, 1.7-3.8 cm long, 1.0-2.5 cm wide, mostly deeply and narrowly three-lobed, somewhat cruciform; flower heads terminal, solitary or in small clusters, somew...
Perennial herb; stems spreading to prostrate, about 60 cm long; herbage rough-hairy; leaves lance-shaped, petioles short-winged or petioles absent; flowers with a long tube and spreading petals, yellow, becoming deep red in age; petals 5-6 cm long; h...
Stem consisting of loosely attached flattened joints up to 8 cm in length by 2-3 cm in width, the joints highly varied in size and shape, bearing areoles with dense clumps of yellowish glochids; rhizomes and often larger roots also often bearing gloc...
