Plant: annual, 1-5 dm., taprooted, hairy or bristly; stem spreading or erect, branchedLeaf: petiole 3-10 cm; blade 3-9 cm, oblong to elliptic, pinnately dissected, segme

Leaves: petiole 3-10 cm; blade 3-9 cm, oblong to elliptic, pinnately dissected, segments 3-8 mm, linear to lanceolate, generally entire; cauline leaves like basal

INFLORESCENCE: compound umbels; peduncle 0-2.5 cm; bracts generally 0; bractlets 2-4, 1.5-2 mm, linear; rays, pedicels very short to 0

Flowers: small, many, generally slightly bilateral; calyx lobes 0 or evident; petals obcordate, white or reddish, tips narrowed, outer petals ± > others; styles short; stamens 5; pistil 1, ovary inferior, 2-chambered, generally with a ± conic, persistent projection or platform on top subtending 2 free styles

Fruit: 2 dry, 1-seeded halves that separate from each other but generally remain attached for some time to a central axis, 2-3 mm, ovate, slightly compressed side-to-side; primary ribs thread-like, prickly, secondary ribs densely prickly; prickles generally ascending, < or > fruit in width; oil tubes per interval between primary ribs 1; fruit axis divided in upper ½; Seed: face grooved

Misc: Disturbed places; < 1500 m.