Hirsute to glabrate perennial, decumbent or ascending, rooting at the lower nodes, 3-6 dm; lvs strigose or glabrate, variable, ovate or narrower, 3-9 נ1.5-4 cm, incised or incised-pinnatifid to trifid; spikes pedunculate, depressed-capitate at anthesis, elongating in fr; bracts to as long as the cal, linear-attenuate, hirsute, usually ciliate; cal 10-13 mm, glandular-hirsute, with very slender, unequal lobes; cor blue to purple or white, the tube twice as long as the cal, the limb 11-15 mm wide, the lobes emarginate; anther appendages large (occasionally absent); fr constricted along the lines of cleavage, the nutlets 3-3.5 mm, reticulate-scrobiculate; 2n=30. Various habitats, often in disturbed soil; Ill. to Tenn., s. Pa., Va., and Fla., w. to Colo. and Tex., and intr. in Mich. and Minn. Feb.-Oct. (Glandularia c.; G. lambertii; G. drummondii; Verbena drummondii)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.