Henbit Deadnettle [Lamium amplexicaule] found in Fletcher, NCon 25 April 2013. It’s a member of the Mint (Lamiaceae) family with a square stem. Wildflowers of the Carolinas, pages 108-109, states it blooms in spring and summer in “dry soils, old fields, disturbed sites, parks, sun.”
USDA Plants Listing: Lamium amplexicaule