Similar Species: Asiatic Dayflower (C. communis) is an introduced annual that is similar in appearance but is found in moist areas, often along ditches, and is reclining. The bract or spathe at the base of the flower is open - not fused near the base.
Virginia Dayflower or Woods Dayflower (C. virginiana) is much taller. It has three blue petals with one slightly smaller than the others. The leaves are wide. It is found in moist to wet shaded areas. Spiderworts (Tradescantia) are also similar but have three equal size petals.

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One of the best general guides to wildflowers of the North Eastern and North Central United States. Newcomb's key is an excellent, simple method for identifying plants. Newcomb has drawings for almost every plant mentioned that are excellent aids to identifying the species. Though only the more common plants are covered this is often the first book I pick up when trying to identify a wildflower.

Wildflo wers of Tennessee the Ohio Valley and the Southern Appalachians

This is perhaps the best of many field guides covering this region. Featuring 446 excellent color photographs (located with the text) and mentioning as similar to those illustrated are another 800 or so species for a total coverage of over 1,200 species. The start of each family section includes line drawings of some of the species showing important features. The text includes the usual description, bloom season, range, habitat and additionally includes information such as medical uses and lore and how the species was named. This is the official field guide of the Tennessee Native Plant Society.