Osmadenia is a monotypic genus of flowering plants in the daisy family containing the single species Osmadenia tenella, which is known by the common name false rosinweed. It is native to the hills and canyons of southern California and Baja California, where it is an uncommon member of the flora in local habitat such as chaparral. It is a hairy, glandular, aromatic annual herb producing an erect stem approaching 40 centimeters in maximum height with threadlike...
