Dimmit sunflower

Helianthus debilis Nuttall subsp. hirtus Heiser, Madroño 13: 162, fig. 7. 1956

Stems erect, branches ascending, densely hirsute or hispid-hirsute. Leaves (larger) 8–9 cm. Peduncles (25–)30–40 cm. Phyllary apices short-attenuate. Paleae: middle teeth white-villous ("bearded"). Rays 14–16. 2n = 34.

Flowering early summer–fall. Sandy soils; of conservation concern; 50–100+ m; Tex.

Subspecies hirtus is known from only a single population, near Carrizo Springs; it is genetically distinct from the two other subspecies (L. H. Rieseberg and M. F. Doyle 1989)