Perennial from a woody rhizome; stems erect, 3-6 dm, finely puberulent; lvs subsessile, often with smaller axillary ones, lanceolate to oblanceolate, 1-3 cm, entire; fls 3-7 in each upper axil, the clusters sessile or subsessile, ±secund, subtended by reduced lvs, forming a spike-like terminal infl; cal 6.5-8 mm, the lobes to half as long as the tube; cor blue (white) 7-12 mm, the median lobe of the lower lip 6 mm wide; 2n=12. Native of Eurasia, found here and there as a weed along roadsides and in waste places in our range. July-Oct.

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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