1. "Systematics of Amsinckiinae (Boraginaceae): The popcorn flowers." (2022)
2. "California Native Plant Society Rare Plant Program inventory of rare and endangered plants of California." (2022)
3. "The Jepson Herbarium." (2022)
4. I. M. Johnston, "Wrightia." 2, "Some noteworthy Borages." 13 (1959)
5. A. Nelson, "Proceedings of the Biological Society of Washington." 16, "Two new plants from New Mexico." 29 (1903)