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A plus sign after a Latin name indicates that the species is further divided into varieties or subspecies. 
Your search found 10 taxa.
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Common Name:
Toothcup
Petals absent or, if present, purplish-white and soon dropped, per Wildflowers of the Sandhills Region.
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Common Name:
Red Toothcup, valley redstem
Usually more than 3 flowers per leaf axil, the petals deep rose-purple, per Weakley's Flora.
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Common Name:
Water-oleander, Water-willow, Swamp Loosestrife, Peatweed
Petals usually more than 10mm long; styles exserted to 20mm, per Vascular Flora of the Carolinas.
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Common Name:
Purple Loosestrife
Flowers numerous in terminal spike-like thyrses, per Weakley's Flora.
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Common Name:
Northern Winged Loosestrife
Each corolla lobe has a fine line of purple that leads to the flower throat, per www.illinoiswildflowers.info.
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Common Name:
Clammy Cuphea, Blue Waxweed
Calyx tube about 3/8" long, ribbed, lopsided. Petals emerge from its summit, per Wildflowers of the Southern Mountains.
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Common Name:
Colombian Waxweed
Floral tube green, glabrous inside; stamens much shorter than floral tube, per Weakley's Flora.
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Common Name:
Crape-myrtle
The flowers have crinkled petals, per Native Trees of the Southeast, An Identification Guide.
Your search found 10 taxa. You are on page PAGE 1 out of 1 pages.