Perennials, rhizomatous. Herb­age glabrous. Stems twining-climbing. Leaves: blade ± cor­date, to 50–120 mm, base rounded or lobed, lobes rounded or 1-pointed, basal sinus ± quadrate to rounded. Bracts immediately subtending sepals, lanceolate, to 30 × 15–35 mm, proximally saccate, margins strongly enfolding sepals, apex obtuse to truncate. Flowers: sepals oval to ovate, 15–23 mm; corolla white, sometimes pinkish-striped, rarely otherwise pink-tinged, 43–70[–88] mm; stamens 23–40 mm; anthers 4–6.5 mm.

Distribution

North America, Europe, Asia, Pacific Islands (New Zealand), temperate regions.

Discussion

Subspecies 3 (2 in the flora).

Subspecies silvatica is native to eastern Mediterranean Europe; it has corollas (50–)55–75(–88) mm, stamens (25–)28–36(–39) mm, and bract apices emarginate to truncate.

Intermediates between Calystegia silvatica and C. sepium may be due to ancient or recent hybridization.

Selected References

None.

Lower Taxa

Calystegia silvatica subsp. disjuncta, Calystegia silvatica subsp. fraterniflora

Key

1	Peduncles 1–2 per axil; anthers 4–5 mm.	Calystegia silvatica subsp. fraterniflora
1	Peduncles 1 per axil; anthers 5–6.5 mm.	Calystegia silvatica subsp. disjuncta