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Heterotheca subaxillaris subsp. latifolia is native to the inland areas of the range of the species from Arizona to North Carolina south into northern Mexico. The range extends northeast North Carolina. Human activities is likely altering the ranges of the the two subspecies and increasing contact between the two subspecies.
The phyllaries have very few or no large hairs near the tip (Semple 2004). Heterotheca psammophila (southwestern U.S. and northern Mexico) and H. chrysopsides (perennial forms in Mexico) are a synonyms.
Heterotheca subaxillaris ssp. latifolia, weedy habitat (Arizona, "H. psammophila" morph)
Heterotheca subaxillaris ssp. latifolia, roadside weeds, Arkansas
Heterotheca subaxillaris ssp latifolia, small shoot, Canby s.n. MIN from Texas
Heterotheca subaxillaris ssp latifolia, heads, Hinton 29996 TEX, chrysopsides morph from Mexico
Heterotheca subaxillaris ssp. latifolia phyllary tip variation across distribution
Last update 20 May 2023 by J.C. Semple
© 2023 J.C. Semple, including all photographs unless otherwise indicated