Critically Imperiled
Stems mostly solitary or sometimes up to 5 in a clump, globose to obovoid, the individual stems mostly 3-5 cm thick and 4-10 cm tall; tubercles on mature stems with upper surface grooved; spines about 50-60 per areole, spreading, typically white, of...
Prostrate annual herb with several primary stems extending radially from a slender taproot; stems to 15 cm long, terete, strigulose with white recurved hairs 0.1-0.2 mm long, internodes 0.6-2.2 cm long; leaves opposite, stipules interpetiolar, separa...
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...
Herbaceous perennial with long creeping roots that function like rhizones; stems glabrous, glaucous, 20-30 cm tall; leaves opposite, sessile, lanceolate, 6-7 cm long, 1.0-1.3 cm wide, tip acute, margins undulate, surface glabrous and glaucous, bluish...
Acaulescent perennial herb from an elongate branching caudex; leaves with lanceolate stipules, petioles 4-8 cm long, glandular-puberulent and sparsely villous with white multicellular hairs to 5(-8) mm long, blades sub-reniform to broadly ovate, the ...