All Species in Petalonyx
- Narrowleaf Sandpaper Plant (Petalonyx linearis)
- Parry's Sandpaper Plant (Petalonyx parryi)
- Petalonyx crenatus (Petalonyx crenatus)
- Petalonyx thurberi subsp. gilmanii (Petalonyx thurberi subsp. gilmanii)
- Petalonyx thurberi subsp. thurberi (Petalonyx thurberi subsp. thurberi)
- Shinyleaf Sandpaper Plant (Petalonyx nitidus)
- Thurber's Sandpaper Plant (Petalonyx thurberi)