- Fullerton Arboretum
- LA Arboretum
- The Huntington
- CITES
- Bihrmann’s Caudiciforms
- CactiGuide.com
- Exotic Plant Books
- C and D Plants
- Botanic Wonders
- Pacific Bulb Society
- The Cactus & Succulent Society of America
- Los Angeles Cactus & Succulent Society
- Long Beach Cactus Club
- San Gabriel Valley Cactus & Succulent Society
- South Coast
Cactus & Succulent Society - San Diego Cactus & Succulent Society
- Anza-Borrego Desert State Park
- Mojave National Preserve
- Joshua Tree National Park
