This section is from the book "Harper's Guide To Wild Flowers", by Caroline A. Creevey. Also available from Amazon: Harper's Guide To Wild Flowers.
Family, Mint. Color, purplish. Calyx and corolla, tubular. Corolla, small, 2-lipped, the lips quite open, upper rounded and concave, lower flat, hanging, with its small side-lobes purple-spotted. Flowers, in whorls in axils of the opposite leaves. Leaves, rounded, deeply toothed, those above clasping the stem, sessile; the lowest long-petioled. April to October.
In cultivated and waste grounds. Common.
 
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