Cosmidium burridgeanum Regel, Index Seminum (St. Petersburg) 1857: 40. 1858

Annuals, 30–40(–70+) cm. Cauline leaves crowded to ± scattered over proximal ¹/2–³/4 of plant heights, internodes mostly 5–40(–60+) mm; lobes mostly linear to filiform, sometimes oblanceolate, 5–25(–45) × 0.5–1(–2+) mm. Calyculi of 5–6(–9) linear to narrowly triangular bractlets 2–4 mm (margins hispido-ciliate). Ray florets 8; laminae wholly red-brown to purplish or mostly red-brown with distal margins yellow to orange, 7–9(–12+) mm. Disc corollas red-brown to purplish, throats shorter than lobes. Cypselae 3.5–4 mm; pappi 0.5–1+ mm. 2n = 18.

Flowering Apr–Jun. Disturbed sites on sands; 10–200 m; Tex.

Thelesperma burridgeanum may be a color-form of T. filifolium.