TransPecos goldenshrub

Haplopappus trianthus S. F. Blake, J. Wash. Acad. Sci. 28: 485. 1938; Ericameria triantha (S. F. Blake) Shinners; Xylothamia triantha (S. F. Blake) G. L. Nesom

Stems terete, finely sulcate, highly branched, bark tan becoming gray, twigs mostly green, minutely ridged, papillate-scabrous. Leaves ascending to spreading, sulcate adaxially, 5–20 × 0.5–1 mm; axillary fascicles sometimes present. Phyllaries 3–6 × 0.8–1.5 mm, mostly chartaceous, midveins enlarged distally, evident as green to brown patches, apices acute. Disc corollas 5–6 mm, tubes glabrous or puberulent, lobes 1–2.5 mm; style branches 2–2.5 mm, appendages 1.2–1.5 mm. Cypselae 3–4 mm, hairy; pappi 4–6 mm. 2n = 18.

Flowering late summer–fall (or with adequate rain). Often in gypseous, calcareous, saline, or gravelly soils; 700–1500 m; Tex.; Mexico (Chihuahua, Coahuila, Durango, Nuevo León).