Heterotheca sessilifloraÌý±¹²¹°ù.Ìýsessiliflora is the southern most race of the species. It occurs near the coast from the Los Angeles area south into Baja California Norte, Mexico. Its leaves can vary from sparsely-hairy and densely glandular to densely-hairy and sparsely-glandular. Mexican plants can be subshrubs and more than a meter tall. This is the type species of sect. Phyllotheca. The taxon is diploid (2n=18).
Last revised 2 May 2025 by J.C. Semple
© 2025 J.C. Semple, including all photographs unless otherwise indicate
1-2. Heterotheca sessiliflora var. sessiliflora, Semple & Chmielewski 8991, San Diego Co., California. 1. Large plant on dunes. 2. Upper stem and Head.
Nesom (1997) accepted variety rank as Het. sessiliflora var. sessiliflora.