Thelesperma longipes

Thelesperma longipes, the longstalk greenthread, is a perennial species of flowering plant in the aster family. It is found from Arizona to northeast Mexico.

Description
It is a perennial herb or subshrub that grows 20 to 40 cm tall. The cauline leaves are "mostly crowded over proximal 1/4–1/2 of plant heights". The internodes are mostly 5 to 25 mm long; the lobes are mostly linear to filiform, and are 5–45 × 0.5-1 mm. It flowers from March to October. There are 0 ray florets per flower head. The disc corollas are yellow, occasionally with red-brown nerves, the throats are equal to or longer than the lobes. The cypselae are 2-3 mm, and there are usually no pappi.

Distribution and habitat
It grows in the United States (Arizona, Texas, New Mexico) and in Mexico (Coahuila, Nuevo León, San Luis Potosí, Tamaulipas) at elevations of 500 to 2100 meters from sea level on openings in desert scrub or limestone ridges.