GROMWELL, in botany, a genus of the pentandria monogynia clas. The corolla is funnel-shaped, with a naked perforated faux; and the calix consists of five segments. There are six species, three of them natives of Britain; viz. the officinal, or gromwell; the purpuro-ceruleum, or lesser creeping gromwell; and the arvense, or bastard alkanet. The seeds of the officinal are accounted diuretic.