Hoary Verbena, Tall Vervain, and Woolly Verbena
Hoary Vervain (Verbena stricta), a member of the Verbenaceae (Verbena Family), is a herbaceous perennial that grows to 4 feet tall and blooms in the spring and summer with blue/purple flowers.
Common Buckeye (Junonia coenia)
Bees also use this plant as a nectar source.
Hoary Vervain is found in open areas such as fields, roadsides, and meadows. It is native mostly to the midwestern part of North America.
The genus name comes from the Latin names for religious ceremonies and the species name means upright (Missouri Botanical Garden).