Gundlachia triantha

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 (80 inches or 6 2/3 feet) tall. The plant produces flower heads in clumps of 3–5 at the ends of small branches. Each had contains 3-7 disc flowers but no ray flowers.