Oxypolis tricuspidata (Elliott) Raf. species synonym

Oxypolis denticulata (Baldwin) Raf. species synonym

Archemora tricuspidata (Elliott) DC. species synonym

Archemora fendleri A.Gray species synonym

Archemora denticulata (Baldwin) DC. species synonym

Archemora ambigua (Nutt.) DC. species synonym

Sium tricuspidatum Elliott species synonym

Sium rigidius L. species synonym

Sium marginatum Poir. species synonym

Sium longifolium Pursh species heterotypic synonym

Sium denticulatum Baldwin ex Ell. species synonym

Peucedanum ternatum Nutt. species synonym

Sison marginatum Michx. species synonym

Peucedanum rigidius (L.) Baill. species synonym

Pastinaca rigidior (L.) Spreng. species synonym

Archemora rigida var. ambigua (Nutt.) Alph.Wood variety synonym

Archemora rigidior var. ambigua (Nutt.) A.Gray variety synonym

Peucedanum rigidius var. ambiguum (Nutt.) Wood variety synonym

Peucedanum rigidum var. ambiguum (Nutt.) Alph.Wood variety synonym

Tiedemannia rigida (L.) J.M.Coult. & Rose species synonym

Oxypolis rigidus Britton species synonym

Archemora rigida (Linnaeus) de Candolle species synonym

Tiedemannia rigidior (L.) J.M.Coult. & Rose species synonym

Oenanthe rigidius (L.) Crantz species synonym

Neurophyllum longifolium Torr. & A.Gray species synonym

Tiedemannia ternata (Nutt.) J.M.Coult. & Rose species synonym

Tiedemannia rigida var. ambigua (Nutt.) J.M.Coult. & Rose variety synonym

Tiedemannia fendleri (A.Gray) J.M.Coult. & Rose species synonym

Pastinaca tricuspidata (Elliott) D.Dietr. species synonym

Pastinaca denticulata (Baldwin) D.Dietr. species synonym

Pastinaca ambigua (Nutt.) Torr. species synonym

Sataria linearis Raf. species synonym

Oenanthe ambigua Nutt. species synonym

Archemora trifoliata Raf. species synonym

Archemora serrata Raf. species synonym

Oxypolis occidentalis J.M.Coult. & Rose species accepted

Oxypolis fendleri (A.Gray) A.Heller species accepted

Oxypolis ternata (Nutt.) A.Heller species accepted

Oxypolis rigidior (L.) Raf. species accepted

Oxypolis rigidior var. ambigua (Nutt.) B.L.Rob. variety synonym

Oxypolis longifolia (Pursh) Small species synonym

Oxypolis turgida Small species synonym

Oxypolis rigidior var. longifolia (Pursh) Britton variety synonym

Oxypolis denticulata (Baldwin) J.R.Edm. species synonym

Peucedanum rigidius Alph.Wood species synonym

Sium denticulatum Baldwin species synonym

Archemora rigidior (L.) DC. species synonym

Oxypolis rigidior subsp. longifolia (Pursh) W.Stone subspecies synonym

Tiedemannia rigidior var. ambigua (Nutt.) J.M.Coult. & Rose variety synonym

Archemora ternata (Nutt.) Nutt. species synonym

Oxypolis destructus Cockerell, 1908 species accepted

Oxypolis rigidior var. rigidior variety synonym

Oxypolis bakeri Britton & P.Wilson ex Bracelin, 1929 species accepted

Sataria linearis var. longipes Raf. variety synonym