Trachelium caeruleum var. halteratum Bianca ex Ces., Pass. & Gibelli variety synonym

Trachelium caeruleum subsp. lanceolatum (Guss.) Arcang. subspecies synonym

Trachelium caeruleum var. halteratum Bianca variety homotypic synonym

Trachelium caeruleum L. species accepted

Trachelium caeruleum f. isabellinum Voss form synonym

Trachelium azureum Gouan species synonym

Trachelium caeruleum f. longiflorum Sennen & Mauricio form synonym

Trachelium caeruleum f. brevidentatum Sennen & Mauricio form synonym

Trachelium ×halteratum (Bianca ex Ces., Pass. & Gibelli) Sandwith species accepted

Trachelium caeruleum subsp. halteratum (Bianca ex Ces., Pass. & Gibelli) Nyman subspecies synonym

Trachelium lanceolatum Guss. species accepted

Trachelium caeruleum var. lanceolatum (Guss.) Ces., Pass. & Gibelli variety synonym

Trachelium caeruleum subsp. isabellinum Voss subspecies synonym

Trachelium caeruleum subsp. brevidentatum Sennen & Mauricio subspecies synonym

Trachelium caeruleum subsp. longiflorum Sennen & Mauricio subspecies synonym