Specimen data from the Consortium of California Herbarium
Cephalanthus occidentalis
Cephalanthus occidentalisL.
Family: Rubiaceae
buttonbush
[Cephalanthus hansenii Wernham, moreCephalanthus occidentalis subsp. californicus (Benth.) A.E.Murray, Cephalanthus occidentalis var. californicus Benth., Cephalanthus occidentalis var. pubescens Raf.]