1997 IUCN red list of threatened plants (1997)

Canotia - Arizona State University. Vascular Plant Herbarium. (Vascular Plant Herbarium, School of Life Sciences, Arizona State University, 2005)

Canotia - Arizona State University. Vascular Plant Herbarium. (Vascular Plant Herbarium, School of Life Sciences, Arizona State University, 2005)

The Great Basin naturalist - Brigham Young University. (M.L. Bean Life Science Museum, Brigham Young University, 1981)

Great Basin naturalist memoirs - Brigham Young University. (Brigham Young University, 1987)

Great Basin naturalist memoirs - Brigham Young University. (Brigham Young University, 1987)

Polemoniaceae of Nevada - Wherry, Edgar T. (Edgar Theodore), 1885 -1982 (Plant Industry Station, 1957)

A popular California flora : or, manual of botany for beginners ... : to which is added an Analytical key to west coast botany ... - Rattan, Volney, 1840 -1915 (Bancroft, 1892)

SIDA, contributions to botany - Mahler, William F. (W. F. Mahler, etc.], 1967)