Much like no. 8 [Veronica agrestis L.]; fls blue; style to 1.5 mm, surpassing the sinus of the fr; fr densely pubescent with long glandular and short eglandular hairs, 2.5-4 נ3.5-6 mm, with rounded lobes, the sinus broader and shallower than in no. 8; 2n=14. Native of Eurasia, now widespread in our range and southward. (V. didyma, misapplied)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.