Center for Plant Conservation. 2019. CPC Best Plant Conservation Practices to Support Species Survival in the Wild. . https://saveplants.org/wp-content/uploads/2020/12/CPC-Best-Practices-5.22.2019.pdf. Accessed: 5/18/2021. 

California Native Plant Society. 2020. Policy on Ethics and Best Practices for Collecting Native Plants (PS-20). Accessed May 18, 2021.

Rancho Santa Ana Botanical Garden

Wall M. 2009. SEED COLLECTION GUIDELINES for California Native Plant Species. Seed Conservation Program, Rancho Santa Ana Botanic Garden. Accessed May 12, 2021

https://uploads-ssl.webflow.com/59613419dcbd9b40dceb57a6/5acd728da1daf8feb5427a0c_Seed%20Collecting%20and%20Storage%20Guidelines.pdf

Wall, M. and J. Macdonald. 2009. Processing Seeds of California Native Plants for Conservation, Storage, and Restoration. Rancho Santa Ana Botanic Garden Occasional Publication, Number 10, Claremont, CA. 216 pages. Accessed May 12, 2021. https://www.cnga.org/resources/Documents/Resources/Plant%20ID/Processing%20Seeds%20of%20CA%20Plants_RSABG_2009.pdf

United State Forest Service, USDA

US Forest Service, USDA. ND. Collecting Native Seed. Accessed May 12, 2021. https://www.fs.fed.us/wildflowers/Native_Plant_Materials/developing/collecting.shtml

Wildflower Ethics and Native Plants. Accessed May 12, 2021. https://www.fs.fed.us/wildflowers/ethics/index.shtml