Known only from the Onyx Pk. area. See Brittonia 10:189 (1958) for original description, Madroño 21(2):94 (1971) for revised nomenclature, and Flora of California 4(2):26 (1979) by L. Dempster for taxonomic treatment.
California Native Plant Society (CNPS).
Inventory of Rare and Endangered Plants (online edition, v8-01a).
California Native Plant Society. Sacramento, CA. Accessed on
.