- To 1.5m tall, hirsute, herbaceous, erect, simple to branching above, 4-angled.
- Opposite, sessile to very short petiolate, typically ovate, serrate (sometimes doubly), hirsute to villous above and below, to +/-9cm long, +/-5cm broad.
- Terminal spikes to -40cm long, indeterminate, with flowers dense and overlapping. Each flower subtended by subulate-attenuate bract to 5mm long. Bracts pubescent and enclosing base of calyx tube.
- Corolla blue-purple to rose or whitish, salverform, 5-lobed, zygomorphic. Corolla tube to 5mm long, glabrous and whitish at base, pubescent near apex. Expanded portion of corolla to +/-7mm broad. Lobes to 3mm long, pubescent externally and internally. Stamens 4, didynamous, included, adnate at top 2/3 of corolla tube. Anthers .8mm long, yellow. Filaments wanting. Style green, glabrous, 1.5mm long. Ovary green, 1mm long, glabrous, superior. Calyx tube dense antrorse pubescent to hirsute, 4-5mm long, 5-lobed, with 5 ridges (nerves). Lobes acuminate, unequal, to -1mm long.
- May - September.
- Disturbed sites, waste ground, pastures, prairies, thickets, roadsides, railroads.
- Native to U.S.
- This attractive species is fairly common in Missouri. The plant is a typical roadsides weed but is deserving of cultivation becasue of its fairly large size and abundant flowers.
This species also has different flower color forms. Form
, shown above, has the typical blue-purple flower color. Form
, has white flowers. Form
, has rose-colored flowers.
This and other plants in the family
often have square stems much like the family
. These two families are closely related. Many of the
also have scented foliage.
Photographs taken at the Kansas City Zoo, 6-29-00, and near Springfield, MO., 7-4-03.