Known from only five occurrences in the Red Mtn. area near Leggett. Potentially threatened by mining. See Proceedings of the American Academy of Arts and Sciences 8:293 (1870) for original description, and Phytologia 66(4):351 (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
.