- To +50cm tall, herbaceous, branched, glabrous to sparsely pubescent, 4-angled.
- Opposite, petiolate, linear-oblong, coarsely toothed, to +6cm long, -2cm wide, glabrous or sparsely pubescent below, fragrant.
- Terminal spikes of whorled flowers (verticillasters). Flowers usually two at a node.
- Corolla light blue, less than 1cm long, tubular, bilabiate, pubescent externally. Lower lip larger than upper lip, to 4mm long. Upper lip galeate. Stamens 2, hidden by upper lip. Calyx bilabiate, with 12-13 ridges (nerves), to 6mm long.
- June - October.
- Pastures, prairies, disturbed sites, waste ground, roadsides, railroads.
- Native to U.S.
- This small species can be found scattered throughout Missouri. The plant is easy to identify because of its small, pale blue flowers, and heavily ribbed calices.
is frequently found in cow and horse pastures with dry, rocky, loamy soil.
Photographs taken at Tall Grass Prairie National Preserve, KS., 9-19-06