Biennial; stems to 1 m tall, unbranched below the middle, with few ascending branches above, densely cobwebby and finely hairy at first, becoming sparsely hairy to nearly naked as it ages; leaves lance-shaped to nearly linear in outline, to 20 cm, gl...
Stout rhizomatous biennial with a robust basal rosette; stem 1.0-1.8 m tall, with many ascending, brown-purple branches; basal leaves green, glabrous, 3-5 dm long, up to 2 dm wide, ragged-edged, divided nearly to the midrib, the divisions tipped with...
Robust biennial or monocarpic perennial; stem strict, 1-2.5 m tall; basal leaves ample, succulent, 30 cm or more long, sinuate or pinnatifid, weakly prickly with short black spines, nearly glabrous, the thin weblike wool tardily deciduous; stem leave...
Perennial herb 0.9-2.5 m tall; stems glabrous, green or bluish-green at the base; leaves all on stem and withered from the basal 1/5 of the stem at the time of anthesis, petioles 3-13 cm long, blades 8-18 cm long and 5-10 cm wide, palmately divided i...
Evergreen shrub, about 1 m tall; leaves pinnately compound with 7-13 oval, leathery, satiny pubescent leaflets; flowers pea-like, purple (rarely white), about 25 mm long; pods 5-14 cm long, 10-14 mm wide, slightly constricted between the seeds; seeds...
Tufted perennial; caudex simple or closely branched, thick with marcescent (withered but persistent) leaf bases; stems few, 1-3 dm long, very slender, erect to partially decumbent, simple or few-branched, sparsely pubescent below with simple or forke...
Stems solitary or few in a cluster, more or less conical, 10-15 cm tall, 7-10 cm wide; ribs 7-12, tubercled; spines usually 3-7 per areole, thick, to over 1 mm near swollen base, often angular in cross section, usually white to pale gray, sometimes b...
Low spreading shrub 2-3(5) dm tall, intricately branched; leaves grayish-green, alternate, entire, linear, tomentulose, tips mucronate; inflorescence a paniculate cyme; heads discoid, 8-11 mm long, 1.8-2.1 mm wide, phyllaries 16-22, outer ones someti...