Blackstonia is a genus of flowering plants of the family Gentianaceae, native to Europe and to nearby regions of Asia and Africa. Its best known species is its type species, Blackstonia perfoliata, the yellow-wort.
Species currently accepted by The Plant List are as follows:
Blackstonia acuminata (Koch & Ziz) Domin
Blackstonia grandiflora (Viv.) Maire
Blackstonia imperfoliata (L.f.) Samp.
Blackstonia perfoliata (L.) Huds.
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