1. W. L. Jepson, "A manual of the flowering plants of California." (1925)
2. "International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017. Regnum Vegetabile 159." (2018)
3. P. A. Munz, "A California flora." (1959)
4. W. L. Jepson, "A flora of California. Vol. II. Capparidaceae to Cornaceae." (1936)
5. L. Abrams, "Illustrated flora of the Pacific States: Washington, Oregon, and California Vol. II. Polygonaceae to Krameriaceae: Buckwheats to Kramerias." (1944)