1	"Plants parasitic; leaves reduced to scales"	Cuscuta
1	"Plants not parasitic; leaves normal"	2
2	"Ovary 2-lobed"	"Dichondra {Dichondra repens}"
2	"Ovary not lobed"	3
3	"Styles 2, sometimes branched"	4
3	"Styles 1 per ovary, with stigma lobes of various shapes"	8
4	"Each style bifid for almost half its length"	"Evolvulus {Evolvulus alsinoides}"
4	"Styles not bifid"	5
5	"Plants functionally unisexual"	6
5	"Plants with bisexual flowers"	7
6	"Sepals of pistillate flowers with 2 or 3 outer sepals enlarging in fruit and adnate to the pedicel, inner sepals smaller"	Hildebrandtia
6	"Sepals of pistillate flowers clawed at the base, all enlargin in fruit and of similar size"	Cladostigma
7	"Stamens and styles included"	Seddera
7	"Stamens and styles exserted"	"Cressa {Cressa cretica}"
8	"Plants with stellate hairs"	Astripomoea
8	"Plants with simple hairs"	9
9	"Stigmas linear to oblong or ovate-oblong"	10
9	"Stigmas globose or nearly so"	12
10	"Stigmas linear or, if oblong, plants virgate shrubs"	Convolvulus
10	"Stigmas from more or less oblong to ovate-oblong; plants herbaceous"	11
11	"Corollas blue, about 1 cm long"	Jacquemontia
11	"Corollas yellow or white, usually with purple centre"	"Hewittia {Hewittia malabrica}"
12	"Pollen grains smooth; corollas usually yellowish or whitish, often with dark centres"	13
12	"Pollen grains spinulose; sorollas often purple or red"	16
13	"Fruits indehsicent, membranous; outer sepals usually serrate or toothed"	Hyalocystis
13	"Fruits dehsicent capsules, not membranous; sepals entire"	14
14	"Capsules circsumscissile, with outer layer splitting around the middle and the top part separating as a lid"	"Operculina {Operculina turpethum}"
14	"Capsules dehiscing by 4 valves"	15
15	"Anthers spiraled after dehiscence; pollen grains 3-12-colpate;"	Merremia
15	"Anthers staight after dehiscence; pollen grains pantoporate"	Xenostegia
16	"Fruits capsules, dehiscing by valves"	Ipomoea
16	"Fruits indehiscent or dehiscing irregularly"	17
17	"Plants twining and climbing; leaves ovate to suborbicular"	Strictocardia
17	"Plants erect shrubs; leaves linear-oblong"	"Turbina {Turbina perbella}"