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- (- 1 -) LCRV-Ocotillo - Fouquieria
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- Ocotillo - Fouquieria splendens
- Boojum tree - Fouquieria columnaris
- Ocotillo - Fouquieria splendens
- Octopus agave - Agave vilmoriniana
- Old Man - Threadleaf Groundsel
- Opuntia - "Cholla cacti"
- Opuntia - "Prickly Pear Cacti"
- Opuntia - Opuntia
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- Beavertail Cactus - Opuntia basilaris
- Cane Cholla - Opuntia imbricata
- Jumping Cholla - Opuntia fulgida
- Teddy-bear Cholla - Opuntia bigelovii
- Orange Caltrop - Arizona Caltrop
- Oreja de perro - Shrubby Coldenia
- (- 2 -) Organ Pipe Cactus - Stenocereus thurberi
Read more about this topic: List Of Plants By Common Name (Sonoran Desert)