Heterotheca sessiliflora var. fastigiata

Heterotheca sessiliflora var. fastigiata (Greene) Semple is the typical variety of subsp. fastigiata.  Its upper stem leaves are usually whitish due to the density of short strigose hairs. It occurs in the San Gabriel, San Bernardino and Santa Monica Mts. at low to moderately high elevations. It is diploid (2n=18).

Nesom (1997) accepted the combination proposed by Semple for the taxon.

Last revised 2 May 2025 by J.C. Semple

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

Heterotheca sessiliflora var fastigiata 8632
H sessiliflora fastigiata flowering shoot
H sessiliflora fastigiata leaves (CA. Los Angeles Co.)
Heterotheca sessiliiflora var fastigiata Fig 16 S 1996

1-2. Heterotheca sessiliflora var. fastigiata. 1. Habitat and habit, Semple & Heard 8632, San Bernardino Co., California. 2. Inflorescence, Semple et al. 5592, Los Angeles Co., California. 3. Upper stem leaves and heads, S & H 8632. 4. Fig 16, Semple (1996).