Narrow-leaved Vervain

This plant is generally
quite tall, reaching over 6 feet.

The tiny flowers
are blueish-purple.

Photos by Lauren Hawkins, 7/03
This 2-acre remnant of moist-soil prairie near the Town Branch of the West Fork of the White River in Fayetteville, Arkansas, is slated to be paved for parking for 36 apartments in three buildings.
Many thanks to Carl Hunter for his identification. This is described on page 184 of his authoritative book, "Wildflowers of Arkansas."