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Your search found 17 taxa.
Flowers axillary, bluish-purple with dark spots, per Guide to the Wildflowers of SC.
Corolla shorter than that of D. oblongifolia (< 12mm, per Wildflowers of the Eastern United States.
Flowers usually solitary from leaf axils in central portion of the stem, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
Flowers usually solitary on axillary peduncles at middle and lower nodes, per Vascular Flora of the Carolinas.
Calyx lobes linear, 3.5-10mm long. Corolla tube about equaling throat, per Vascular Flora of the Carolinas.
Flowers in axils of median & upper nodes, also usually from terminal cluster, per Weakley's Flora.
One or a few flowers, erect, their mouths facing up, per Wildflowers of the Sandhills Region.
Corolla funnelform, with tube, open throat, 5 subequal petals, 2-cleft stigma, per Vascular Flora of the Carolinas.
Corolla 6-10cm long, opening at night and withering by mid-morning, per Weakley's Flora.
0.6" long, tubular, deeply 2-lipped corolla with leaf-like bracts, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
Flower white to lavender w purple markings, upper lip notched, lower 3-lobed, per Wildflowers of the Southern Mountains.
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