A European perennial herb, Chelidonium majus, a flower of the poppy family with yellow flowers, native to Europe and western Asia.
The greater celandine / tetterwort, Chelidonium majus or Sanguinaria canadensis.
Any of various plants of the genus Asclepias.
The plant Euphorbia maculata (spotted spurge).
Any of several vines of genus Vincetoxicum (syn. Cynanchum), especially black swallow-wort (Vincetoxicum nigrum, syn. Cynanchum nigrum) or white swallowwort (Vincetoxicum hirundinaria, syn. Cynanchum vincetoxicum)
Seutera angustifolia
Calotropis gen. et spp.