| Cactaceae | |
Arrojadoa penicillata var. decumbens
| Backeb. & Voll | Arch. Jard. Bot. Rio de Janeiro 9: 164, f. | 1950 |
| Cactaceae | |
Arrojadoa penicillata subsp. grandis
| N.P. Taylor & Zappi | Bradleya 40: 77 | 2022 |
| Cactaceae | |
Arrojadoa penicillata subsp. minensis
| N.P. Taylor & Zappi | Bradleya 40: 76 | 2022 |
| Cactaceae | |
Arrojadoa penicillata subsp. penicillata
| | | |
| Cactaceae | |
Arrojadoa penicillata var. penicillata
| | | |
| Cactaceae | |
Arrojadoa penicillata var. spinosior
| Buining & Brederoo | Succulentia 59: 20 | 1980 |