Helianthus praecox subsp. hirtus
Mem. Torrey Bot. Club 22(3): 54. 1969.
Common names: Dimmit sunflower
Basionym: Helianthus debilis subsp. hirtus Heiser
Treatment appears in FNA Volume 21. Treatment on page 152.
Revision as of 00:58, 27 July 2019 by FNA>Volume Importer
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.
Phenology: Flowering early summer–fall.
Habitat: Sandy soils
Elevation: 50–100+ m
Discussion
Of conservation concern.
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)
Selected References
None.
Lower Taxa
None.