Calystegia spithamaea in Flora of North America @ efloras.org

16. Calystegia spithamaea (Linnaeus) Pursh, Fl. Amer. Sept. 1: 143. 1813.
[E F]

Convolvulus spithamaeus Linnaeus, Sp. Pl. 1: 158. 1753

Perennials, rhizomatous. Herbage glabrate or tomentose, hairs sometimes whitish. Stems erect, 10–35(–50) cm. Leaves: blade narrowly to broadly elliptic, to 80 × 35 mm, base cuneate, rounded, or lobed, lobes rounded or ± 1-pointed, to 11 mm. Bracts immediately subtending sepals, lance-ovate, oblong, or oval, (13–)16–25(–29) × 8–14(–20) mm, proximally flat or ± keeled, apex acute to obtuse, closely enfolding sepals. Flowers: sepals 12–17 mm; corolla white, 35–63(–67) mm.

Subspecies 3 (3 in the flora): c, e North America.

1 Habit ± lax; herbage glabrate to pubescent; leaf blades ultimately ± flat 16a Calystegia spithamaea subsp. spithamaea

+ Habit ± compact; herbage tomentose, hairs sometimes whitish; leaf blades ± conduplicate. (2)

2 (1) Leaf blade bases usually lobed, lobes to 5(–6) mm, sometimes cuneate; corollas (38–)43–59(–64) mm; plants (10–)15–35(–40 cm) 16b Calystegia spithamaea subsp. stans

+ Leaf blade bases lobed, lobes 4–11 mm; corollas 35–47(–53) mm; plants (15–)25–35(–40) cm 16c Calystegia spithamaea subsp. purshiana

Lower Taxa

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