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.
A somewhat hairy species with purplish flowers clustered in the axils or terminal. August to October.
Wet places, somewhat rare.
M. arvensis. - Color, white, pink or violet. (See White Flowers, p. 123.)
 
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