One of the mysteries of the English language finally explained.
Common milkwort, Polygala vulgaris; also called rogation flower.
Late 16th century; earliest use found in John Gerard (c1545–1612), herbalist. From gang + flower, so called on account of its flowering in Rogation Week, after Gang Week, Gang Day.
gang flower/ˈɡaŋ ˌflaʊə/
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