Trans Pecos Desert Goldenrod

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.

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

Gundlachia triantha, the TransPecos goldenshrub or Trans-Pecos desert goldenrod, is a North American species of plants in the sunflower family. It is native to northern Mexico (Chihuahua, Coahuila, Durango, Nuevo León), with the range extending just over the Río Grande into western Texas in and near Big Bend National Park.

Gundlachia triantha is a shrub up to 200 cm (6+1⁄2 ft) tall. The plant produces flower heads in clumps of 3–5 at the ends of small branches. Each head contains 3–7 disc flowers but no ray flowers.