Plant: Plant 2-8 dm, annual, taprooted, glabrous, foul-smelling; stem erect, branched Leaves: basal clustered, 3-15 cm, oblong to ovate, ternately or pinnately lobed to 1-pinnate with leaflets 1-2 cm, ovate to round, petiole 2-10 cm; upper cauline ovate, pinnately dissected with segments 2-15 mm, thread-like to linear, petiole 0 INFLORESCENCE: umbels compound, terminal and lateral; peduncles 0 or 3-10 cm; bractlets 2-4 mm, linear; rays 2-8, 1-2.5 cm; pedicels 2-5 mm Flowers: many, small, marginal bilateral; calyx lobes widely lanceolate; petals 5, oblong, white or rosy, marginal 2-lobed, tips of all narrowed; stamens 5; pistil 1, ovary inferior, 2-chambered, generally with a ± conic, persistent projection or platform on top subtending 2 free styles; styles elongate Fruit: 2 dry, 1-seeded halves that separate from each other but generally remain attached for some time to a central axis, 2.5-5 mm wide; ± round; halves not separating readily; ribs primary and secondary, thread-like, in a hard fruit-wall; oil tubes 0; fruit axis divided to base; Seed: face concave Misc: Disturbed places, often near gardens; generally < 1000 m.
Erect, branched above, 3-7 dm; lowest lvs simple or variously divided into obovate incised segments; upper lvs pinnately dissected into linear segments; outer enlarged pet to 4 mm; fr 3-5 mm wide; sep persistent, those of the outer row of frs 1 mm or more; 2n=22. Native of the Mediterranean region, established as a weed over much of the U.S., especially southward. June, July.
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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