Thelesperma nuecense
Thelesperma nuecense, the Rio Grande greenthread, is a herbaceous annual flowering plant in the aster family. It is endemic to Texas.
Description
Thelesperma nuecense is an annual herb that grows up to 3 feet tall. The cauline leaves are "scattered over proximal 1/4–1/2 of plant heights". 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.The species typically flowers from March to July.