Known from approximately ten occurrences near Ione. Threatened by vehicles and mining. See Leaflets of Western Botany 7(10):237-238 (1955) for original description, and Phytologia 66(4):320-321 (1989) 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
.