Triodanis
Species
Six species are accepted.
- Triodanis coloradoensis (Buckley) McVaugh - Colorado Venus' looking-glass - endemic to Texas despite the name
- Triodanis holzingeri McVaugh - Holzinger's Venus' looking-glass - Great Plains plus Arizona and Tennessee
- Triodanis lamprosperma McVaugh - Prairie Venus' looking-glass - southern Great Plains
- Triodanis leptocarpa (Nutt.) Nieuwl. - Slimpod Venus' looking-glass - Great Plains
- Triodanis perfoliata (L.) Nieuwl. - Clasping Venus' looking-glass - widespread across North and South America from Canada to Argentina; naturalized in China, Korea, Australia
- Triodanis perfoliata subsp. biflora (Ruiz & Pav.) Lammers (synonym Triodanis biflora (Ruiz & Pav.) Greene) - small Venus' looking-glass - United States and northern Mexico; Colombia to southern Argentina
- Triodanis perfoliata subsp. perfoliata – Canada to Guatemala
- Triodanis texana McVaugh - Texas Venus' looking-glass - endemic to Texas