Fr transversely ellipsoid, cordate at base, notched at summit, laterally flattened, the ribs low and obtuse; oil-tubes 1-3 in the intervals, 9-11 on the commissure; carpophore wanting; umbel sessile, compound, subtended by one reduced foliage lf; umbellets 2-4; involucel of spatulate foliaceous bractlets; sep obsolete; pet white, not inflexed; stylopodium none; perennial from a globose tuber, bearing a few ternately decompound lvs and a simple terminal umbel of comparatively large, nearly sessile fls. Monospecific.

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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