1. Psilactis brevilingulata Schultz-Bipontinus ex Hemsley, Diagn. Pl. Nov. Mexic. 2: 34. 1879.
Aster brevilingulatus (Schultz-Bipontinus ex Hemsley) McVaugh; Machaeranthera brevilingulata (Schultz-Bipontinus ex Hemsley) B. L. Turner & D. B. Horne
Annuals, 15–75 cm. Stems and branches stipitate-glandular, more densely distally, often also with appressed or erect hairs. Distal leaf blades sessile, lanceolate to linear-lanceolate, smallest 2–10 × 0.5–1.5 mm. Involucres broadly turbinate to hemispheric, 2–4 mm. Phyllaries lanceolate to linear, slightly unequal, 1.5–3.5 × 0.2–0.6 mm, bases indurate, margins scarious. Receptacles flat to convex, 1.5–2.5 mm diam. Ray florets 15–40; laminae 1–4 × 0.2–0.5 mm. Disc florets 15–35; corollas 1.5–2.5 mm. Ray cypselae 1–1.5 mm, moderately appressed-hairy. Disc cypselae 1.3–2 mm, moderately appressed-hairy; pappi 20–25, 2–2.5 mm. 2n = 18 (Mexico).
Flowering May–Oct. Fields, roadsides, stream banks, open areas in oak and pine-oak woodlands; 1300–2100 m; Ariz., N.Mex., Tex.; Mexico; South America (Colombia, Peru).
In the flora area, Psilactis brevilingulata occurs in the Chihuahuan Desert regions of southeastern Arizona, southwestern New Mexico, and western Texas.