1	"Stems strongly twining"	2
1	"Stems not twining, plant sometimes a scandent shrub"	9
2	"Leaf blade with domatia in axils of midvein on lower surface"	Urceola
2	"Leaf blade otherwise"	3
3	"Flowers less than 10 mm wide"	4
3	"Flowers more than 10 mm wide"	5
4	"Latex clear"	Parsonsia
4	"Latex white"	Melodinus
5	"Flowers less than 30 mm wide"	Trachelospermum
5	"Flowers more than 30 mm wide"	6
6	"Corolla salver-shaped"	Chonemorpha
6	"Corolla bell-shaped to funnel-shaped"	7
7	"Corolla bright yellow"	Pentalinon
7	"Corolla white, pink or red with a yellow throat"	8
8	"Stamens conspicuously protruding on long, twisted filaments"	Beaumontia
8	"Stamens not conspicuously protruding on long, twisted filaments"	Mandevilla
9	"Stems fleshy-succulent, foliage usually deciduous"	10
9	"Stems wiry to woody, foliage usually evergreen"	12
10	"Stems armed with spines in pairs or 3s"	Pachypodium
10	"Stems unarmed"	11
11	"Stems brittle, anthers without apical appendages"	Plumeria
11	"Stems solid, anthers with long filiform apical appendages"	Adenium
12	"Stems with spines"	Carissa
12	"Stems without spines"	13
13	"Leaves with a sharp point"	Alyxia
13	"Leaves without a sharp point"	14
14	"Leaves alternate or spirally arranged"	15
14	"Leaves opposite or 3–7-whorled"	16
15	"Leaves spirally arranged and clustered at stem apices, corolla white"	Cerbera
15	"Leaves alternate, corolla yellow or orange"	Cascabela
16	"Corolline corona absent in corolla mouth"	17
16	"Corolline corona present in corolla mouth"	21
17	"Corolline corona of 5 scales present just above stamens in corolla tube"	Allamanda
17	"Corolline corona absent in corolla tube"	18
18	"Fruit a berry or drupe"	19
18	"Fruit a follicle"	20
19	"Corolla lobes overlapping to the left in bud, fruit a berry"	Acokanthera
19	"Corolla lobes overlapping to the right in bud, fruit a drupe"	Ochrosia
20	"Fruit fleshy, with an orange to red aril"	Tabernaemontana
20	"Fruit woody, brown to grey-brown, without an aril"	Alstonia
21	"Corolla lobes overlapping to the left in bud"	Wrightia
21	"Corolla lobes overlapping to the right in bud"	22
22	"Corolla funnel-shaped"	Nerium
22	"Corolla bell- or salver-shaped"	Strophanthus