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Genus Calystegia Family Convolvulaceae

Description: Perennial herbs with trailing or twining stems.

Leaves simple, entire, often sagittate or hastate, ± glabrous; hairs simple.

Flowers axillary, solitary or rarely in few-flowered cymes, with large persistent bracteoles ± enclosing the calyx. Sepals 5, free, subequal. Corolla campanulate to funnel-shaped, entire or shallowly 5-lobed, glabrous, with distinct mid-petaline bands. Stamens 5, subequal with short hairs along the basal fused margins of the filaments up to about the point of attachment. Ovary 1- or incompletely 2-locular with 4 ovules, glabrous; style 1, bearing 2 oblong or elliptic stigmatic lobes.

Capsule globose or ovoid, splitting longitudinally into 4 valves.


Distribution and occurrence: World: c. 25 species, mainly temperate regions. Australia: 4 species (3 species native, 1 species naturalized), all States except N.T.

Key modified by Peter G. Wilson, March 2021.

Text by R. W. Johnson
Taxon concept:

 Key to the species 
1Leaves somewhat fleshy, rounded, reniform; plants trailing, rarely weakly twiningCalystegia soldanella
Leaves membranous, ovate to sagittate, more or less acute;  plants usually twining2
2Corolla less than 2.5 cm longCalystegia marginata
Corolla more than 2.5 cm long
                       Back to 1
3
3Bracteoles acuteCalystegia sepium
Bracteoles obtuse to rounded or emarginate
                       Back to 2
4
4Corolla 2.5–3.5 cm long;  bracteoles obtuse to rounded, to 1.5 cm longCalystegia affinis
Corolla at least 4 cm long; bracteoles rounded to truncate, emarginate, 2–3.5 cm long
                       Back to 3
Calystegia silvatica

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