Stem consisting of loosely attached flattened joints up to 8 cm in length by 2-3 cm in width, the joints highly varied in size and shape, bearing areoles with dense clumps of yellowish glochids; rhizomes and often larger roots also often bearing gloc...
Subrhizomatous perennial; stems 1-4 dm tall; leaves mostly basal, oblanceolate to obovate, dentate towards apex, lightly tomentose or glabrate at maturity; stem leaves few and much reduced upwards; heads radiate, erect, several to many in a corymbose...
Annual, much branched at base, 2-8 cm tall; culms erect, with 1 node, papillose-pilose, mostly obscured by the leaves; leaves with prominently veined, papillose-pilose sheaths; ligules 0.2 mm long, membranous and with short hairs; blades 1-4 cm long,...
Compact herbaceous perennial from a woody rhizome; stems 1-5, 10-30(32) cm high, 1.0-2.3 mm in diameter at the base, finely puberulent; leaves moderately thick, opaque, minutely puberulent and soon glabrescent or puberulent merely on the midvein, fai...
Perennial herb from a woody base; stems many, to 30 cm long; leaves many, mostly deeply and narrowly three-lobed, somewhat cruciform; flower heads terminal, solitary or in small clusters, somewhat bell-shaped; involucral bracts lance-shaped, about 4-...
Biennial, 20-37 cm tall; stems solitary to several, usually erect, leafy, densely covered with sessile to short-stalked, 3-celled, light-colored capitate glands with some short and longer simple nonglandular hairs; leaves 1-6 cm long, 0.5-2 cm wide, ...
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, thickened crown and short rootstock, 1-3 dm tall, simple or branched, more or less decumbent at base, densely pubescent and glandular throughout; leaves (2)3-6 cm long, 4-14 mm wide; stem leaves very numerous, the...
