Stout or slender, to 1.5 m, with few lvs and branches; some of the roots often distally tuberous-thickened; lvs once pinnate, sessile or nearly so, oblong to deltoid, the 5–9 lfls narrowly linear to oblanceolate or elliptic, 6–14 cm × 5–40 mm, entire to strongly serrate; rays mostly 20+, spreading, forming a loose umbel to 15 cm wide; pedicels 5–20 mm; fr rounded at both ends, 4.5–6 mm, more than half as wide; 2n=32. Swamps, marshes, ditch-banks, and wet prairies; L.I. to s. Ont. and Minn., s. to Fla. and Tex. July–Sept. (O. turgida)
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