All Species in Homalocephala
- Cottontop Cactus (Homalocephala polycephala)
- Homalocephala parryi (Homalocephala parryi)
- Homalocephala polycephala subsp. polycephala (Homalocephala polycephala subsp. polycephala)
- Homalocephala polycephala subsp. xeranthemoides (Homalocephala polycephala subsp. xeranthemoides)
- Horse Crippler (Homalocephala texensis)