Sep ascending; pet white or sometimes yellow, deeply 2-lobed, gradually narrowed to the base; short filaments flanked on each side by a short semicircular gland; anthers oblong; ovary ellipsoid, with 2-6 ovules per locule; style elongate, persistent; fr elliptic or oval, flattened parallel to the septum, few-seeded; herbs with chiefly entire lvs, ±pubescent with stellate hairs. 5, temp. Eurasia.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.