Plants perennial or monocarpic perennial. Rhizomes present or not; stems short or elongated, densely lanate, internodes short with leaves in rosettes. Rosettes persistent or decidous. Leaves lanceolate or linear, adpressed to reflexed, light to dark green or grayish, glabrous to densely pilose, margins flat to involute, ciliate to smooth, apices pointed to mucronulate, glabrous to densely barbellate. Elongated axis present or absent, ramification present or not, arising from the apex of the rosette. Axis of the synflorescence present or not, arising always from the apex of the rosette. Paraclades axillary to the rosette leaves or arising from a central axis or lateral axis of the synflorescence, densely pilose in the region of insertion in the bracts. Bracts occur spirally along axis and paraclades, deciduous or persistent, foliaceous, lanceolate, coloration, pilosity, margins and apices the same as the rosette leaves. Spathes membranous, glabrous to pilose, broad to narrow, apices oblique to truncated, ciliated or glabrous. Scapes persistent or deciduous, arising always from the apex of the paraclades, ranging from 1 to 800 per paraclade, arranged in an umbel, glabrous to densely pilose, trichomes simple or T-shaped. Capitula persistent or deciduous, white, ocherish or sulfurous; receptacles always pilose, trichomes equal to or longer than flowers. Involucral bracts brown to dark-brown, in 2 to numerous series, oblong to broadly ovate, concave, both faces glabrous to pilose, margins glabrous to pilose, apices truncated to pointed, apiculate or not. Flowers diclinous, trimerous, 20—600 per capitulum, staminate and pistillate flowers positioned variably on the capitulum, trichomes of the perianth, smooth or tuberculate, ornamentation internal present or absent. Floral bracts always present, obovate to linear, concave to navicular. Staminate flowers pedicellate, pedicel glabrous to pilose, sepals briefly connate at the base, light brown to black, ciliate; apice always pilose; corollas infundibular, urceolate or tubular, smooth, base of the corolla conspicuously carnose, lobes 3—6, hyaline, entire or bifid, involute only after anthesis; stamens 3, exserted, filaments cylindrical, adnate to the corolla tube only in the basal portion; anthers dorsifixed, bithecate, pistillodes 3, clavate to cylindric, densely covered with papillose trichomes. Pistillate flowers sessile or pedicellate; sepals free, light brown to black, ciliate, apices always pilose; petals free, hyaline, apices pilose or glabrous; staminodes squamiform in the region of the gynoecial septa; gynoecium 3-locular, styles and appendages always free at the same height on the column of the gynoecium; appendages pyriform or clavate, covered by short or long papillose trichomes; styles filiform, with the same length or longer than the appendages; stigmas always simple. Fruit a loculicidal capsule. Seeds 1—2 mm in length, red-brown to dark-brown, testa densely reticulate.