Vincetoxicum nigrum

Black Swallow Wort black swallowwort dog-strangling-vine Vincetossico scuro
Cynanchum louiseae

Vincetoxicum nigrum
Vincetoxicum officinale
Vinco minor
Viola
Viola adunca
Viola adunca var. adunca
Viola affinis
Viola alba
Viola alpina
Viola ammotropha
Viola arborescens
Viola arenaria
Viola arvensis
Viola bicolor
Viola biflora
Viola blanda
Viola blanda var. palustriformis
Viola brittoniana
Viola brittoniana var. pectinata
Viola bubanii
Viola calcarata
Viola canadensis
Viola canadensis var. rugulosa
Viola canina
Viola cenisia
Viola collina
Viola conspersa
Viola cornuta
Viola corsica
Viola cucullata
Viola culminis
Viola eugeniae
Viola hastata
Viola hirta
Viola kitaibeliana
Viola labradorica
Viola lanceolata
Viola lanceolata ssp. occidentalis
Viola lutea subsp. sudetica