Visnaga daucoides Gaertn.

Ammi visnaga (L.) Lam. Fl. Fr. 3: 462. 1778
Daucus Visnaga L. Sp. PI. 242. 1753.
Apium Visnaga Crantz, Class. Umbell. 104. 1767.
Selinum Visnaga E. H. L. Krause in Sturm, Fl. Deuts. ed. 2. 12: 44. 1904.
Erect, branching biennial (?), 2-8 dm. high, glabrous throughout; leaves deltoid in general outline, excluding the petioles 5-20 cm. long, pinnately decompound, the ultimate divisions linear to filiform, setaceous to cuspidate-acute, divaricate, entire, 5-35 mm. long, 0.5-1 mm. broad; petioles about 10 cm. long; cauline leaves ternately or pinnately dissected; peduncles 8-14 cm. long; involucral bracts equaling or exceeding the rays; involucel of numerous setiformacute, entire bractlets, ascending at maturity and equaling or exceeding the pedicels; rays 60-100, subfiliform, unequal, 2-5 cm. long, spreading in flower but rigidly contracted in fruit, borne on a discoid receptacle; pedicels numerous, filiform, unequal, 3-13 mm. long, spreading in flower but rigidly contracted in fruit, borne on a small discoid receptacle; carpophore entire; fruit oblong-ovoid to ovoid, 2-2.5 mm. long, 1.5-1.7 mm. broad.
Type locality: "Habitat in Europa australi." collector unknown.
Distribution: Eurasia; sporadically introduced; Pennsylvania, North Carolina, Alabama, Florida, Oregon, California, Bermuda, and Oaxaca.