Stachys arvensis, (L.) L.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1972, Flora Europaea. Volume 3. Diapensiacea to Myoporaceae, Cambridge: Cambridge University Press : 157

56. S. arvensis (L.) L. , Sp. Pl. ed. 2, 814 (1763).

Erect, hirsute annual 10-40 cm. Leaves 10-40 x 8-30 mm, cordate-ovate, obtuse, crenate, hirsute. Verticillasters 4- to 6-flowered, usually 6-12, the upper crowded, the lower distant. Calyx 5-7(-8) mm, hirsute; teeth about as long as tube. Corolla 6-8 mm, white, pale pink or purple, scarcely exceeding calyx; upper lip c. 2 mm, entire; lower lip 2-3 mm. 2« = 10. Cultivated fields and sandy ground; usually calcifuge. S., W. & C. Europe eastwards to W. Poland, W. Jugoslavia and Kriti and northwards to S. Sweden; an occasional casual further north and east. Al Au Az Be BI Br Co Cr Da Ga Ge Gr Hb He Ho Hs It Ju Lu Po Sa Si Su.

A common weed almost throughout its range.