Smithsonian Contr. Knowl. 3(5): 109. 1852.
Perennials or subshrubs (may flower first year), 20–40+ cm. Cauline leaves mostly crowded over proximal 1/4–1/2 of plant heights, internodes mostly 5–25+ mm; lobes mostly linear to filiform, 5–25(–45+) × 0.5(–1) mm. Calyculi of 5 ovate bractlets 1–3 mm. Ray florets 0. Disc corollas yellow, sometimes with red-brown nerves, throats equal to or longer than lobes. Cypselae 2–3 mm; pappi usually 0, rarely 0.1–0.3+ mm. 2n = 40.
Phenology: Flowering (Mar–)Apr–Oct.
Habitat: Openings in desert scrub, limestone ridges
Elevation: 500–2100 m
Ariz., N.Mex., Tex., Mexico (Coahuila, Nuevo León, San Luis Potosí, Tamaulipas).