This section is from the book "Harper's Guide To Wild Flowers", by Caroline A. Creevey. Also available from Amazon: Harper's Guide To Wild Flowers.
Family, Pickerel - weed. Color, violet-blue. Perianth, tubular, 2-lipped, the upper lip composed of 3 ovate lobes, the middle one of which is the longest; the lower lip also 3-divided, spreading, drooping. Upper lip marked with a pair of yellow spots. Stamens, 6, 3 of them often being worthless, all borne upon the perianth-tube. Anthers and style, blue. Leaves, thick, triangular, heart or arrow-shape at base, marked with many parallel veins, on long, sheathing petioles, mostly from the root, 4 to 8 inches long, half as wide. Flowers, borne in a raceme or thick spike growing out of a sheathing bract. After fruiting the flower perianth coils from the apex downward and surrounds the fruit. June to October.

Pickerel-Weed (Pondeteria cordata)
An aquatic, found on the borders of ponds and lakes from Nova Scotia to Florida westward to Minnesota and Texas. (See illustration, p. 301.)
Family, Pickerel-weed. Color, pale blue or white. (See White Flowers, p. 44.)
 
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