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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 17 taxa.
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Common Name:
Blue Twinflower, Pineland Dyschoriste, Oblong Twinflower
Flowers axillary, bluish-purple with dark spots, per Guide to the Wildflowers of SC.
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Common Name:
Swamp Twinflower, Swamp Dyschoriste
Corolla shorter than that of D. oblongifolia (< 12mm, per Wildflowers of the Eastern United States.
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Common Name:
Limestone Wild Petunia, Glade Wild Petunia
Flowers usually solitary from leaf axils in central portion of the stem, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
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Common Name:
Pursh's Wild Petunia
Flowers usually solitary on axillary peduncles at middle and lower nodes, per Vascular Flora of the Carolinas.
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Common Name:
Mexican Bluebell
Calyx lobes linear, 3.5-10mm long. Corolla tube about equaling throat, per Vascular Flora of the Carolinas.
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Common Name:
Hairy Wild Petunia, Low Wild Petunia, Glade Wild Petunia
Flowers in axils of median & upper nodes, also usually from terminal cluster, per Weakley's Flora.
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Common Name:
Sandhills Wild Petunia
One or a few flowers, erect, their mouths facing up, per Wildflowers of the Sandhills Region.
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Common Name:
Carolina Wild Petunia, Common Wild Petunia, Hairy Ruellia
Corolla funnelform, with tube, open throat, 5 subequal petals, 2-cleft stigma, per Vascular Flora of the Carolinas.
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Common Name:
Night-flowering Wild Petunia, Night-blooming Wild Petunia
Corolla 6-10cm long, opening at night and withering by mid-morning, per Weakley's Flora.
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Common Name:
Branched Foldwing, Dicliptera
0.6" long, tubular, deeply 2-lipped corolla with leaf-like bracts, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
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Common Name:
American Water-willow
Flower white to lavender w purple markings, upper lip notched, lower 3-lobed, per Wildflowers of the Southern Mountains.
Common Name:
Coastal Plain Water-willow, Loose-flower Water-willow
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Common Name:
Pineland Water-willow, Narrowleaf Water-willow
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Common Name:
thickleaf water-willow
Your search found 17 taxa. You are on page PAGE 1 out of 1 pages.