Gleason & Cronquist
Vascular plants of NE US and adjacent Canada
Hypanthium saucer-shaped; sep 5, oblong, acute, reticulately veined, alternating with linear-oblong bractlets; pet 5, yellow, minute, spatulate; stamens 5; pistils 5-10, rarely more; ovule 1, ascending; style filiform, lateral; fr a small, smooth achene; perennial herbs with long-petioled, 3-foliolate lvs and small fls in cymes. 6-7, all but ours Asiatic.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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