This is very much like a garden Verbena, an attractive little plant, from four to six inches tall, with hairy stems and prettily shaped leaves, dull green, soft and hairy. The gay little flowers are about half an inch across, with a bright pinkish-lilac corolla, with a white or yellowish "eye," and a sticky-hairy calyx, and form a charming flat-topped cluster. This grows among the rocks, above the Desert Laboratory at Tucson and in similar places.

Common Vervain  Verbena prostrata. Wild Verbena V.Arizonica

Common Vervain- Verbena prostrata. Wild Verbena-V.Arizonica. MINT FAMILY. Labiatae.