This section is from the book "Who's Who Among The Wild Flowers", by W. I. Beecroft. Also available from Amazon: A Field Guide to Edible Wild Plants.
Hibiscus Moscheutos. Mallow Family. July - Sept.
A shrub-like plant 4 - 6 feet high, found in marshes, on lake-shores, river-banks. Massachusetts and southward; usually near the coast; locally in the interior.
Pink or white, 4 - 7 inches across, 5 divisions, conspicuously veined; flowers borne singly, or in scant clusters at the summit of the stems.
Egg-shaped, pointed, toothed, densely white-woolly beneath. Lower leaves and sometimes the upper ones 3-lobed.
 
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