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16c. Calystegia spithamaea (Linnaeus) Pursh subsp. purshiana (Wherry) Brummitt, Ann. Missouri Bot. Gard. 52: 215. 1965.
[E]
Convolvulus purshianus Wherry, Proc. Pennsylvania Acad. Sci. 7: 163. 1933, based on Calystegia tomentosa Pursh, Fl. Amer. Sept. 1: 143. 1813, not Convolvulus tomentosus Linnaeus 1753
Plants (15–)25–35(–40) cm; habit ± compact. Herbage tomentose, hairs sometimes whitish. Leaf blades narrowly elliptic, ± conduplicate, base lobed, lobes 4–11 mm. Flowers: corolla 35–47(–53) mm; stamens 21–26 mm.
Flowering May–Aug. Clay-loam, shale barrens; Md., N.Y., Pa., Va., W.Va.
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