Thelesperma nuecense, the Rio Grande greenthread,[1] is an annual species of flowering plant in the aster family. It is native to Texas.
It is an annual herb that grows up to 3 feet tall.[2] The cauline leaves are "scattered over proximal 1/4–1/2(–3/4) of plant heights".[3] It flowers from March to July. There are 8 ray florets per flower head; the laminae are yellow, suffused with a red-brown spot or band. The disc corollas are red-brown, with throats usually shorter than the lobes. The cypselae are 5 to 5.5 mm long; the pappi are 0.5 to 1 mm long.
It grows in Texas at elevations of 0 to 200 meters from sea level on "disturbed sites on sands".[4]