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| Ancistrocactus |
→ |
Sclerocactus |
| - brevihamatus |
→ |
Sclerocactus brevihamatus |
| - crassihamatus |
→ |
Sclerocactus uncinatus ssp. crassihamatus |
| - mathsonii |
→ |
Sclerocactus uncinatus ssp. crassihamatus |
| - megarhizus |
→ |
Sclerocactus scheeri |
| - scheeri |
→ |
Sclerocactus scheeri |
| - - fa. brevihamatus |
→ |
Sclerocactus brevihamatus |
| - - - megarhizus |
→ |
Sclerocactus scheeri |
| - - ssp. tobuschii |
→ |
Sclerocactus brevihamatus ssp. tobuschii |
| - tobuschii |
→ |
Sclerocactus brevihamatus ssp. tobuschii |
| - uncinatus |
→ |
Sclerocactus uncinatus |
| - - ssp. crassihamatus |
→ |
Sclerocactus uncinatus ssp. crassihamatus |
| - - - wrightii |
→ |
Sclerocactus uncinatus ssp. wrightii |
| - - var. wrightii |
→ |
Sclerocactus uncinatus ssp. wrightii |
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