Critically Imperiled
Biennial to short-lived monocarpic perennial, erect, 3-8 dm tall; stems mostly solitary, occasionally branched from the base; basal leaves in a rosette, senescent at flowering; basal leaves ovate in outline, 3-5 cm long, pinnatifid in 9-15 linear div...
Perennial herb from shallow slender rhizomes; stems from dense basal rosettes, erect, 4-35 cm tall, green or purplish, glabrous, unbranched on the lower 1/2; basal leaves thick, entire, linear-oblanceolate, sessile, 8-30 mm long, glabrous except on t...
Stems 1.0-2.5 cm in diameter, solitary or a few in a cluster, barely protruding above ground level; tubercles not grooved; spines about 20 per areole, all radials, radiating from areole and appressed to the plant, 1-2 mm long, usually whitish, pinkis...
Plants perennial, forming loose mats from numerous branched and tangled woody rhizomes; stems ascending-decumbent, 2-8 cm tall, minutely puberulent; stem leaves opposite, sessile, glabrous or with a few trichomes at the base, entire to serrulate, nar...
Perennial from a slender, creeping, woody rhizome; stems few, usually erect, up to 4 dm high, puberulent throughout, glandular above; leaves entire, the lower ovate, the upper lanceolate, thin, minutely puberulent, amplexical, the upper sessile, the ...
Plants robust annuals to about 8 dm tall; stems to 2 cm thick, pubescent and glandular throughout; stem leaves broadly lanceolate, 4-10 cm long, 1.5-5 cm wide, irregularly crenate-dentate or lobed, lower and basal leaves deeply lobed to pinnatifid; i...
Perennial herb with numerous branched and tangled rhizomes from a central caudex; above-ground stems solitary or in clumps, arising from upturned rhizome tips, forming short, leafy tufts 1-4 cm tall; leaves opposite and sessile, spreading to ascendin...