[bioone.org] Description: Dudleya chasmophyta S.McCabe sp. nov. is endemic to a small portion of Santiago Canyon, Orange County, CA. It is similar to the rare D. cymosa subsp. ovatifolia (Britton) Moran of western Los Angeles County, with which the new species has been confused. Dudleya chasmophyta differs from D. cymosa subsp. ovatifolia by having peduncle bracts not strongly reflexed, abaxial leaf surfaces green to green-brown, corolla lobes spreading distally, flower throats not constricted or only slightly so, and flower buds broader in the middle. Unlike D. cymosa subsp. marcescens Moran, D. chasmophyta is evergreen, has yellow, rather than yellow-to-orange corollas, and compared to D. cymosa subsp. marcescens has narrower leaves in relation to the width. Relationships to other geographically proximal taxa were also considered. (link added by Mary Ann Machi)