Annual, 3-6 dm, glabrous and glaucous; lower lvs oblong to obovate, sessile or somewhat petiolate; upper lvs perfoliate, ovate, 2-5 cm; umbels peduncled, the 4-10 rays spreading or ascending, 0.5-2 cm; bracts none; bractlets broadly ovate to elliptic, acuminate, 8-12 mm, much surpassing the subsessile fls; fr dark brown or black, oblong-elliptic, 2.5-3 mm, obscurely ribbed; 2n=16. Native of Europe and w. Asia, established as a weed in fields and waste places from s. N.Y. to s. Ind. and Kans., s. to N.C. and Ark., and occasionally adventive elsewhere. May, June.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
©The New York Botanical Garden. All rights reserved. Used by permission.
From Flora of Indiana (1940) by Charles C. Deam
This species was discovered in 1933 by Miss Edna Banta who says it is frequent along Lost Fork Creek about 3 miles east of Brooksburg, Jefferson County. She adds that the weed was known on her father's farm for at least five years.