1	Herbs, prostrate or creeping. Ovary deeply 2-lobed. Styles 2, almost gynobasic. Flowers small, solitary, axillary. Corolla deeply 5-lobed. Leaves reniform or cordate orbicular		5 Dichondra
+	Herbs or shrubs, climbers, twining or rarely prostrate or erect. Ovary entire, styles 1 or 2, terminal on apex of ovary. Flowers medium to large, rarely small, if small then in compound, paniculate inflorescences. Corolla rarely deeply lobed, if so then the petals bifid or lobed. Leaves variable		(2)
2 (1)	Herbs, subshrubby, perennial. Styles 2.		(3)
+	Herbs, climbers, perennial or annual. Styles usually 1 (2 in Evolvulus and these again bilobed into 4 filiform stigmas)		(4)
3 (2)	Stamens and styles exserted		4 Cressa
+	Stamens and styles included		13 Seddera
4 (2)	Stigmas filiform, attenuate to ellipsoid or oblong		(5)
+	Stigmas globose or bi-globose		(8)
5 (4)	Stem and leaves with a stellate indumentum Stigmas ellipsoid to oblong		8 Jacquemontia
+	Stem and leaves glabrous or with an indumentum of 2-branched hairs.Stigmas filiform to elliptic and complanate		(6)
6 (5)	Styles 2, each lobed into 2 filiform stigmas		6 Evolvulus
+	Styles single		(7)
7 (6)	Stigmas filiform		3 Convolvulus
+	Stigmas oblong or elliptic, complanate		2 Calystegia
8 (4)	Sepals accrescent in fruit, patent, scarious, falling with the fruit. Flowers 5-6mm long, white. Corolla limbs shallowly lobed		11 Porana
+	Sepals not or barely accrescent in fruit, falling with the fruit or not. Flowers usually 10 mm or longer, variously coloured. Corolla limbs shallowly lobed to sub-entire		(9)
9 (8)	Corolla broad-infundibuliform or campanulate, yellow, yellowish or white and often with red or purple eye. Pollen smooth, colpate		(10)
+	Corolla infundibuliform to salverform, rarely campanulate, variously coloured but often purple. Pollen spinose, porate		(11)
10 (9)	Capsule circumscissile, the upper part of epicarp separating from the lower part of the endocarp. Corolla usually white or yellow throughout. Stem terete or winged		10 Operculina
+	Capsule opening by 4 valves or irregularly. Corolla white or yellow, often with red purple centre. Stems terete		9 Merremia
11 (9)	Fruits capsular, thin-walled, opening by valves or irregularly dehiscent. Herbaceous or rarely woody, twining or prostrate or rarely erect plants. Corolla usually glabrous outside		7 Ipomoea
+	Fruits indehiscent, fleshy, woody or somewhat ligneous. Suffrutescent to woody twining plants. Corolla usually pubescent outside, at least the interplicae		(12)
12 (11)	Corolla white, salverform. Stamens attached near the middle of the tube. Stigmas linear oblong. Fruits nearly dry		12 Rivea
+	Corolla purple to rose, rarely white, infundibuliform. Stamens attached below the middle of the tube. Stigmas globose or bi-globose. Fruits fleshy or leathery, rarely nearly dry		1 Argyreia