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16b. Calystegia spithamaea (Linnaeus) Pursh subsp. stans (Michaux) Brummitt, Ann. Missouri Bot. Gard. 52: 215. 1965.
[E]
Convolvulus stans Michaux, Fl. Bor.-Amer. 1: 136. 1803
Plants (10–)15–35(–40) cm; habit ± compact. Herbage tomentose, hairs sometimes whitish. Leaf blades elliptic, ± conduplicate, base usually lobed, lobes to 5(–6) mm, sometimes cuneate. Flowers: corolla (38–)43–59(–64) mm; stamens (21–)23–31 mm.
Flowering May–Aug. Alluvial gravel, glacial till, dry birch or coniferous woodlands, prairie grasslands, sandy soils; N.S., Ont., Que.; Mich., Minn., N.Y., Wis.
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