Perennial herb Stem: erect, nearly hairless to sparsely hairy. Leaves: opposite, stalked (at least 5 mm long), more than 2 cm wide, egg-shaped, toothed, nearly hairless or sparsely hairy. Inflorescence: a cluster of more than three spikes, each spike dense and less than 7 mm across. Flowers: bluish purple, well separated along the spike, with bracts shorter than the calyx. Fruit: four nutlets surrounded by the persistent calyx.
Similar species: Verbena x engelmanii is a hybrid of Verbena hastata and Verbena urticifolia. The attributes of the hybrid are intermediate of the parents. See links below for further information on the parents.
Flowering: July to September
Habitat and ecology: Rare in woods, fields, thickets, and rocky estuaries.
Occurence in the Chicago region: native
Etymology: Verbena is the Latin name for vervain. Engelmannii was named after George Engelmann, 19th century German-American physician and botanist.