Sammlung Jan Carius

Kakteenweb.de

Sammlung Wolfgang Meier

Gartenteich & Koi

Kakteen-Haage

Haage-Kakteen.de

Uhlig-Kakteen

Uhlig-Kakteen.com

Bach's Cactus Nursery, Tucson, Arizona, USA

bachs-cacti.com

B & B Cactus Farm, Tucson, Arizona, USA

bandbcactus.com

Organ Pipe Cactus National Monument

nps.gov/orpi/

Saguaro National Park

nps.gov/sagu/