Fr orbicular to ellipsoid, slightly flattened laterally, somewhat constricted at the commissure, ribs narrow, scarcely prominent; oil-tubes obscure or none; carpophore bifid to the base; umbels compound, terminal and lateral; rays few; umbellets small, the involucel of conspicuously foliaceous bractlets exceeding the short pedicels; sep obsolete; pet yellow or greenish- yellow; stylopodium depressed-conic; plants with simple entire lvs. 150, N. Hemisphere.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.