Anthriscus cerefolium (L.) Hoffm.

Anthriscus cerefolium (L.) Hoffm. Gen. Umbell. 41. 1814
Scandix Cerefolium L. Sp. PI. 257. 1753.
Chaerophyllum Cerefolium Crantz, Stirp. Austr. 3: 70. 1767.
Myrrhodes Cerefolium Kuntze, Rev. Gen. 1: 268. 1891.
Selinum Cerefolium E. H. L. Krause in Sturm, Fl. Deuts. ed. 2. 12: 73. 1904.
Chaerefolium Cerefolium Schinz & Thell. Viert. Nat. Ges. Zurich 53: 554. 1909.
Cerefolium Cerefolium Britton in Britt. & Brown, 111. Fl. ed. 2. 2: 629. 1913. Much branched annuals, 4.5-7 dm. high, finely pubescent above or glabrous throughout; leaves deltoid in general outline, excluding the petioles 5-15 cm. long, ternately or ternatepinnately decompound, the ultimate divisions ovate to oblong, 3-6 mm. long; petioles about 10 cm. long; upper cauline leaves nearly sessile; peduncles 3 cm. long to obsolete; rays 3-6, 1.5-4 cm. long; pedicels 3-6, 4-6 mm. long; involucel of several linear-lanceolate, acuminate, reflexed bractlets, about 2 mm. long, shorter than the pedicels; fruit linear, with a ribbed beak one-third of its length, 6 mm. long, 1-2 mm. broad, glabrous, the ribs obsolete.
Type locality: "In apris et arvis Europae australioris," collector unknown. Distribution: Europe; introduced into Quebec, and from Connecticut to Pennsylvania.