PTERONEURUM (from pteron, a wing, and neuron, a nerve; referring to the winged placentas). ORD. Cruciferae. A small genus of rock plants, included, by the authors of the "Genera Plantarum," under Cardamine (which see for culture of the species described below). PTERONEURUM carnosum (fleshy). fl., calyx spreading; corolla twice as long as the calyx; petals white, obovate. June. l., segments ovate, sub-emarginate, glaucescent. h. 3in. Eastern Europe, &c., 1824. Hardy perennial.