Oresbia heterocarpa Cron & B.Nord.

Erect perennial herb, to about 30 cm tall; stems herbaceous, somewhat woody at the base, unbranched or branching sparingly near base, tomentose to cobwebby, glabrescent with age. Leaves cauline, alternate, sessile, narrowly obovate to elliptic or ovate, non-pinnatifid, lamina 16-66(-80) x 4-23(-28) mm, thickly cobwebby to glabrescent above, densely white-tomentose below; apex acute; margin dentate to serrate, revolute; leaf-base clasping, without auricles. Capitula heterogamous, radiate, usually in twos or threes (rarely as many as 11) per stem, occasionally solitary; peduncles 0.5-4 cm to point of branching, as long as 9 cm if unbranched, densely cobwebby, subtended by lanceolate bracts (1-2.5 cm long) and with smaller bracts along their length, distally nude; receptacle flat or slightly convex, glabrous; involucre widely campanulate to cup-shaped, calyculate with 4 to 7 linear-lanceolate calyculus bracts 2-4 mm long; phyllaries subuniseriate, 16 to 20, linear-lanceolate, (5.5-)6.5-7.5 mm long, cobwebby to tomentose, glabrescent toward the apex, 1-to 3-veined, acuminate, margins narrowly scarious. Ray florets 8 to 13, female, glabrous; tube 2.5-3 mm long, cylindrical; limb oblong, 5-12 mm, 4-veined, yellow. Disc florets hermaphroditic, 25 to 42; corolla tubular below, narrowly campanulate above, 5.0-6.2 mm long, yellow; corolla lobes triangular-ovate, 0.5-0.7 mm long, apically subcucullate and minutely papillate; anthers basally sagittate or shortly caudate; apical appendage ovate, obtuse; endothecial tissue radial; filament collar distinctly balusterform; style branches with separate stigmatic areas; apex truncate with short sweeping hairs, outside glabrous. Cypselae heteromorphic: ray cypselae 4 winged, glabrous, brown to reddish brown, 2.0-3.5 mm long; epicarp cells rectangular, smooth with raised ridges; disc cypselae oblong-cylindrical with 6 ribs, not compressed or margined or winged, 1.5-2.2 mm long, with mucilaginous twin hairs on ribs; epicarp cells with rounded ends, striate; carpopodium absent or obscure; pappus bristles pluriseriate, 4-5 mm long, barbellate, white, caducous.