Heterotheca sessiliflora var. bolanderioides

Heterotheca sessiliflora var. bolanderioides Semple is serpentine soil endemic to the hill tops around San Francisco Bay.  It is a member of subsp. echioides and is the only tetraploid (2n=36) taxon in the species.

Nesom (1997) treated it as a variety: Het. echioides (Benth.) Shinners var. bolanderioides (Semple) Nesom.

Heterotheca sessiliflora ssp. bolanderi, Semple 1996

Last revised 2 May 2025 by J.C. Semple

© 2025 J.C. Semple, including all photographs unless otherwise indicated

Heterotheca sessiliflora bolanderioides 9333
Heterotheca sess bolanderioides 5670
H. sessiliflora var bolanderioides habit
H sessiliflora bolanderioides flowering head

1-4. Heterotheca sessilifolia var. bolanderioides. 1. Habitat, Semple et al. 9333, Marin Co., California. 2. Robust plant, Semple et al. 5670, Santa Cruz Co., California. 3. Small plant, Semple et al. 9339, Contra Costa Co., California. 4. Head, Semple & Chmielewski 8919, Santa Clara Co., California.