Calystegia vanzuukiae (Convolvulaceae), a Remarkable New Species From Central California

Abstract

A new species is described as Calystegia vanzuukiae (Convolvulaceae) from Placer and Eldorado Counties of central California. The species occurs in the western Sierra Nevada in chaparral mixed conifer forests on serpentine and gabbro soils. Gross morphological similarity to C. occidentalis suggests that these species may be sister taxa. While leaf morphology differs, habit and ecology are similar for the new taxon and C. stebbinsii. Possible evolutionary relationships to C. stebbinsii are also considered.