• Webster's Revised Unabridged Dictionary
    • n Gang-flower (Bot) The common English milkwort (Polygala vulgaris), so called from blossoming in gang week.
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Century Dictionary and Cyclopedia
    • n gang-flower The milkwort, Polygala vulgaris: so named from its blossoming in gang-week.
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In literature:

Women adore the river Ganges, bathing in it and offering it flowers.
"Ten Great Religions" by James Freeman Clarke
A plant termed in this country Gang Flower is the same as Rogation Flower, recalling the perambulation of parishes on one of those days.
"Notes and Queries, Number 193, July 9, 1853" by Various