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.
Rhexia virginica. Meadow Beauty Family. July - Sept.
A square-stemmed plant 10 - 18 inches high, found in sandy marshes or near water. Maine to Florida, Ontario to Iowa and southward.
Magenta or purplish, division 4, 8 prominent, golden yellow, floral organs.
Opposite, mostly 5-veined, toothed, seated on stem.

Meadow Beauty.
R. mariana. May be distinguished from the preceding by its round stems and short-stemmed leaves. Found south of New Jersey.
 
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