PLANT: Annual herbs; stems 6 35 cm tall. LEAVES: subsessile; blades 13 36 mm long, 2 7 mm wide, linear to narrowly oblong to elliptic, 3 nerved; margins entire. FLOWERS: pedicels 0.5 1.5( 5) mm long; calyx actinomorphic, 3 6 mm long; corolla 4 5 mm long, the tube included, white except the middle lobe of the lower lip pink purple; stamens only slightly exceeding corolla, the filaments blue, the anther sacs slightly divaricate. NUTLETS: ca. 2.5 mm long, dark brown to greenish tan, the apex with a few short curled hairs. 2n = 14. NOTES: Mesquite scrub to pine oak woodland, often in riparian zones: Gila, Yavapai cos.; 1150 1650 m (3800-5400 ft); Jul Oct; s Can to n FL, c TX, w NE. Kearney et al. (1960) report this species in Cochise Co. and Lewis (1945) reports it in extreme s Navajo Co., but neither cite a specimen nor a more precise locality. REFERENCES: Christy, Charlotte M., et. al. 2003. Lamiaceae. J. Ariz. - Nev. Acad. Sci. Volume 35(2).
Stems much branched, 2-4 dm, finely puberulent, glandular in the infl; lvs short-petioled, mostly elliptic to lanceolate, usually 3-nerved, acute; pedicels to 1 cm; cal-lobes 2-3 mm, in fr 3-5 mm; cor blue, the oblong lobes 1.5-2 mm; nutlets 2.5-3 mm, puberulent at the top. Dry soil; Vt. and Ont. to Minn. and Nebr., s. to Fla. and Ariz. Aug., Sept. (Trichostema b.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.