This section is from the book "British Wild Flowers In The Four Seasons", by Thomas Moore. Also available from Amazon: British Wild Flowers.
M. pratense: stem erect or ascending, glabrous or nearly so, 1/2-1 foot high, with very spreading, opposite branches; leaves lanceolate, the floral ones distant from each other, short, and often toothed at the base; flowers yellow, in distant axillary pairs, all turned one way. - Woods and bushy places. Fl. July, August.
 
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