Sep narrow, saccate at base; pet large, purple, with broad blade and narrow claw; glands large, annular; pistil elevated on a short gynophore that elongates greatly in fr; ovules 2-3 per locule; fr very broad and flat, reticulately veined, the silvery septum horizontally striolate; seeds reniform; sparsely hairy herbs with cordate or deltoid- cordate, coarsely dentate, acuminate lvs, those toward the base opposite or nearly so. 3, Europe.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.