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...
Perennial with slender, creeping rhizomes; stems mostly 8-10 cm long, sparsely to densely glandular pubescent; leaves evergreen, 1-4 cm long, entire, linear to narrowly lanceolate or elliptic, glabrous to ciliate or sometimes pubescent like the stems...
Annual herbs, stems 2-15 cm tall, succulent, branches ascending, yellow-white or reddish-purple, glabrous or sparsely farinose; leaves entire, alternate, fleshy, ovate to suborbicular, 5-15 mm long; flowers monoecious; bracts of female flowers triang...
Dwarf annual with 1 to many stems; leaf blades about 1 mm broad, flat or involute, short; culms mostly 5-15 cm tall; panicle narrow, few-flowered, the branches erect-appressed; spikelets 4-6 mm long; glumes shorter than the first floret, broad, stron...
Stems unbranched (occasionally 2-3-branched near base), green, ovoid to elongate-cylindric, 2.9-25(-35) × 2.8-12.5(-20) cm; ribs usually (11-)13(-15), well developed, tubercles evident on ribs. Spines obscuring stems; radial spines 4-6...
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 ...