Hymenoxys glabra (Nuttall) Shinners; H. scaposa (de Candolle) K. F. Parker var. linearis (Nuttall) K. F. Parker; H. scaposa var. villosa Shinners; Tetraneuris angustata Greene; T. angustifolia Rydberg; T. fastigiata Greene; T. glabra (Nuttall) Greene; T. linearis (Nuttall) Greene; T. scaposa var. linearis (Nuttall) K. F. Parker; T. scaposa var. villosa (Shinners) Shinners; T. stenophylla Rydberg

Plants 14–40+ cm. Stems 1–30(–50), not densely woolly among proximal leaves. Leaves crowded (internodes not evident), blades linear, linear-oblanceolate, oblanceolate, or spatulate, usually densely gland-dotted. Involucres 5–10 × 7–12 mm. Ray corollas 9.5–22 mm. Disc corollas 2.8–3.5 mm. 2n = 30, 60.

Flowering (Jan–)Mar–Jun(–Dec). Roadsides, hillsides, pastures, open areas, edges of woods; 300–2400 m; Colo., Kans., Nebr., N.Mex., Okla., Tex.; Mexico (Chihuahua, Coahuila, Nuevo León, San Luis Potosí, Tamaulipas, Zacatecas).