S1
Critically Imperiled
Euphorbia rayturneri (Ray Turner's Spurge)
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...
Fissidens littlei (Little's fissidens moss)
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...
Helianthus arizonensis (Arizona Sunflower)
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...
Heuchera woodsiaphila (Capitan Peak Alumroot)
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 ...
Hexalectris arizonica (Arizona Crested Coralroot)
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...