From Flora of Indiana (1940) by Charles C. Deam
This species was found in 1925 by R. C. Friesner in Clifty Falls State Park, Jefferson County. It was well established about half a mile north of Tunnel Falls. It has also been reported from Ohio and Vanderburg Counties by Hansen (Proc. Indiana Acad. Sci. 34: 257. 1925.) There is a specimen in the herbarium of Indiana University collected by Wible in Lawrence County.
Stems freely branched, villous, to 5 dm; petioles 1-5 mm; lvs broadly ovate to triangular-ovate, 1-3 cm, truncate at base, ±hastate by the development of 1-2 low teeth at the lateral angles; pedicels very slender, 1-3 cm, glabrous throughout or villosulous near the base and summit only; fls as in no. 1 [Kickxia spuria (L.) Dumort.]; 2n=18, 36. Native of Eurasia, established as a weed in moist sandy soil in most of our range, s. to Fla. and La. June-Sept. (Linaria e.)
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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