Texas prairie dawn, Hymenoxys texana, is one of the state’s smallest sunflowers. Its yellow flower heads are less than half an inch in diameter, consisting of disk florets 2 mm. long. The delicate annual grows 1 to 6 inches tall with several divergent branches from the base, and flowers in March or early April, disappearing by mid-summer. It lives in patches of dull gray barren sand, in sparsely vegetated or barren areas on slightly saline soils in coastal prairie grasslands. 

As shown in this map of Texas, Hymenoxys texana is found in South Texas, in Fort Bend and Harris counties. It is known from about 50 sites which are mainly within Addicks and Barker Resevoirs in western Harris County.