Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Genus Description - Sep inflexed, at length deciduous above the hypanthium; pet long-clawed, in bud incurved with the infolded sides of the broad blade clasping the anther, at anthesis spreading or deflexed between the sep; stamens at anthesis free and exsert; ovary 3-angled and 3-locular, immersed in the disk; style 3-lobed; fr a 3-lobed capsule-like drupe subtended by the persistent hypanthium, the exocarp thin, dark, coriaceous, the endocarp eventually loculicidally dehiscent; shrubs with alternate, 3-nerved, glandular-serrate lvs and numerous small white (in our spp.) to blue fls in sessile or short- peduncled umbels aggregated into terminal or axillary pedunculate panicles. 55, N. Amer.