Lobelia siphilitica var. rosea N.Coleman
Lobelia antisyphilitica Hayne
Lobelia siphilitica var. densiflora (J.Rennie) E.Wimm.
Lobelia siphilitica var. grandis E.Wimm.
Lobelia belgica De Jonghe
Rapuntium siphiliticum (L.) Mill.
Rapuntium syphiliticum Moench
Dortmanna siphilitica (L.) Kuntze
Lobelia densiflora J.Rennie
Lobelia siphilitica f. albiflora Britton
Lobelia siphilitica var. maculata A.DC.
Lobelia siphilitica var. ludoviciana A.DC.
Lobelia siphilitica f. purpurea Voss
Lobelia siphilitica var. alba G.Don & W.H.Baxter
Lobelia siphilitica var. minor Hook.
Lobelia bollii E.Wimm.
Lobelia siphilitica var. bollii (E.Wimm.) E.Wimm.
Lobelia siphilitica f. alba (G.Don & W.H.Baxter) Voss
Lobelia siphilitica f. laevicalyx Fernald
Lobelia siphilitica var. candida Alph.Wood
Lobelia reflexa Stokes
Lobelia siphilitica f. ludoviciana (A.DC.) Voss
Lobelia coelestis Nutt. ex Loudon