Fr ovate to oblong, flattened laterally; ribs 5 per mericarp; oil-tubes solitary in the intervals, 2 on the commissure; carpophore bifid half its length; umbels compound, without invol; rays several to many, the inner often short; umbellets many-fld, with very unequal pedicels, the central fl commonly sessile; bractlets few, short, lance-linear; sep short, triangular; pet bright yellow; stylopodium wanting; branching perennials 3–8 dm, glabrous or nearly so, from a cluster of thickened roots, some of or all the lvs once to thrice ternately compound. 4, N. Amer.
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