Synonyms
Viorna pitcheri (Torr. & A.Gray) Britton
Coriflora pitcheri (Torr. & A.Gray) W.A.Weber
Clematis viorna var. pitcheri (Torr. & A.Gray) J.James
Clematis simsii subsp. pitcheri (Torr. & A.Gray) Kuntze
Clematis cordata subsp. pitcheri (Torr. & A.Gray) Voss