From Flora of Indiana (1940) by Charles C. Deam
I have specimens of this species only from Wells County where it is well established in north Bluffton. It was reported also by Dr. Clapp from the vicinity of New Albany, Floyd County.
Annual, 1-3 dm, usually much branched; cauline lvs oblong-obovate or subrotund, usually petiolate, 1-2 cm, rounded to retuse at the summit, those subtending the umbel broadly ovate to obovate, those of the umbel smaller, ovate; rays of the umbel 3, repeatedly dichotomous; fr with 2 low longitudinal keels on each valve; seeds 1.5 mm, marked on the outer face with 4 rows of (2)3 or 4 large pits, on the inner face with 2 deep longitudinal furrows; 2n=16. Native of Eurasia, widely intr. in N. Amer. from N.B. to Alas., s. to Fla. and Calif., but seldom abundant. Summer. (Tithymalus p.; Galarhoeus p.)
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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