Trichostema dichotomum L.
Trichostema dichotomum L. var. puberulum Fernald & Grisc.
Trichostema pilosum Roth
Eastern Blue Curls, Forked Bluecurls, Blue Curls, Bastard Pennyroyal
Blue curls are North American natives, members of the mint family. Trichostema means “hairlike stamens.”
Identification: Plants are 4-30" (10-76 cm) in height—the ones I have seen are at the low end of that range. Foliage is multiply branched and the main stems may be tinged with red. Flowers are ½-¾" (1.3-1.9 cm) long × ¼-⁵/₁₆" (6.3-8.3 mm) wide. Flowers are blue, with four upper petals about the same size, and a long lower petal that is spotted and contains white. The most unique feature of these flowers are several long, arching stamens, poking out of the top of the flower and hanging downward in front. Leaves are small (less than 1" (2.5 cm) long), hairy, entire, and lacking in teeth.
Trichostema dichotomum on North Carolina Wildflowers, Shrubs, & Trees, by Jeff Pippen
Trichostema dichotomum on Southeastern Flora, the Southeastern U.S. Plant Identification Resource
Trichostema dichotomum on Missouriplants.com
Trichostema dichotomum on the Connecticut Botanical Society's Connecticut wildflowers site
Trichostema dichotomum on CalPhotos
Trichostema dichotomum at the Lady Bird Johnson Wildflower Center
Trichostema dichotomum on Wikimedia Commons
Trichostema dichotomum on Forestry Images
Trichostema dichotomum on Nature Photography by Shirley Denton
Trichostema dichotomum description by Thomas H. Kent, last updated 16 Aug 2013.