Imperiled
Stems usually solitary, depressed-globose to ovoid, 3.2-11.0 cm long, 3.8-8.0 cm in diameter; ribs 13-17; tubercles inconspicuous; areoles woolly; central spines absent or rarely 1, radial spines 7-13, straw-colored, spreading, 6-13 mm long; flowers ...
Herbaceous perennial; stems mostly single and unbranched, glabrous, slender, 4-10(12) dm tall; leaves opposite, lanceolate to ovate, acute, obtuse to cordate at base, coarsely and unevenly laciniate-serrate, thin, glabrous except sparsely glandular p...
Herbaceous perennial, 4-11 dm tall, with 1-several stems; leaves glabrous, opposite or whorled, broadly lanceolate to ovate, coarsely serrate, thin, 6-8 cm long; inflorescence a loose, few-branched, terminal panicle, somewhat glandular pubescent; flo...
Hemispherical subshrubs, 20-40 cm high, with many straight, generally unbranched, stems from a woody base; unevenly woolly-tomentose on stems and leaves, older growth sometimes becoming glabrous; leaves alternate, linear or filiform, 2-7 cm long and ...
Low perennial, from multicipital caudex; stems ascending, 10-15 cm high, finely retrorsely grayish puberulent, becoming glandular in the inflorescence; basal and lowest stem leaves usually withered at anthesis; stem leaves 5-8 pairs, linear, acuminat...
Perennial; stems several from woody crown, 2-5 dm tall, usually freely branching, puberulent and glandular, at least in inflorescence; basal leaves puberulent, oblanceolate, (5)10-18 cm long, 1-2 cm wide, attenuate to long petioles; cauline leaves 1-...
Sub-rhizomatous clumped perennial herb; stem 3-7 dm long, ascending to erect; upper stems sparsely to densely hirsute, eglandular; leaves alternate, lanceolate, 3-6 cm long, 4-7 mm wide, narrowly lanceolate to linear-lanceolate on the upper plant; in...