1	"Stamens mostly with a coronal appendage; pollen grains cohering in tetrads or pollinia"	2
1	"Stamens lacking a coronal appendage; pollen grains single"	18
2	"Anthers 4-locular; pollen tetrads rectangular or T-shaped"	3
2	"Anthers 2-locular; pollen in linear tetrads"	5
3	"Pollen contained within closed sacs (pollinia) adhering to translator; translator with hardened but not sticky end [trib. Secamoneae]"	Secamone
3	"Pollen loose on spoon-shaped receptacle or translator; translator with sticky end which adheres to pollinator, [trib. Periploceae]"	4
4	"Corolline corona lobes pointed or forked; corolla tube funnel-shaped"	Cryptostegia
4	"Corolline corona lobes broad, cusped or toothed; corolla tube cylindrical"	Gymnanthera
5	"Pollinia pendulous in each anther locule [trib. Asclepiadeae]"	6
5	"Pollinia erect to horizontal in each anther locule"	14
6	"Large woody shrubs or small trees"	Calotropis
6	"Herbs, shrubs or vines"	7
7	"Flowers salverform"	"Araujia: Araujia sericifera"
7	"Flowers rotate to campanulate"	8
8	"Gynostegial corona of 5 staminal lobes only"	9
8	"Gynostegial corona of interstaminal and staminal parts"	12
9	"Herbs or woody or herbaceous twiners"	10
9	"Small shrubs"	11
10	"Staminal corona lobes lacking conspicuous basal hump"	Cynanchum
10	"Staminal corona lobes with conspicuous basal hump"	Vincetoxicum
11	"Staminal corona lobes with adaxial appendages"	"Asclepias: Asclepias curassavica"
11	"Staminal corona lobes lacking adaxial appendages"	Gomphocarpus
12	"Gynostegial corona of highly fused staminal and interstaminal parts, proximal staminal corona parts lacking"	Cynanchum
12	"Gynostegial corona of connate ring of staminal and interstaminal parts and 5 proximal corona parts basally adnate to this rings"	13
13	"Plants herbaceous; corolla flattened-campanulate; annular corona of dense hairs present"	"Oxystelma: Oxystelma esculentum"
13	"Plants succulent; corolla rotate; annular corona absent"	Cynanchum
14	"Pollinia without pellucid germinating mouth, or if present then on outer margin only; anthers with membranous terminal appendage [trib. Marsdenieae]"	15
14	"Pollinia with pellucid germinating mouth on inner margin or apex; anthers lacking terminal appendage [trib. Stapelieae]"	17
15	"Staminal corona of lobes with inrolled keels"	"Hoya: Hoya australis subsp. rupicola"
15	"Staminal corona, if present, of lobes lacking inrolled keels"	16
16	"Gynostegium not markedly capitate; pollinia oblong to ellipsoidal"	Marsdenia
16	"Gynostegium markedly capitate; pollinia globose to subglobose"	Vincetoxicum
17	"Plants with succulent stems; leaves vestigial or rudimentary and early caducous"	"Orbea: Orbea variegata"
17	"Plants with herbaceous to slightly fleshy stems; leaves well-developed"	"Brachystelma: Brachystelma glabriflorum"
18	"Stems with spines"	Carissa
18	"Stems without spines"	19
19	"Stems twining"	20
19	"Stems erect or scrambling, but not twining"	23
20	"Fruit indehiscent, a fleshy drupe or berry; seeds ecomose"	Alyxia
20	"Fruit dehiscent, a follicle or capsule; seeds comose"	21
21	"Stamens fully or partially exserted from tube"	Parsonsia
21	"Stamens included in tube"	22
22	"Fruit of 2 woody follicles; corolla salverform; corolla tube slightly constricted about stamens and slightly narrower above"	"Ichnocarpus: Ichnocarpus frutescens"
22	"Fruit a capsule; corolla usually not salverform; corolla tube not constricted about stamens"	Parsonsia
23	"Fruit dehiscent"	24
23	"Fruit indehiscent"	30
24	Herbs	25
24	"Shrubs or vines"	26
25	"Stems stoloniferous; corolla lilac-blue to white"	"Vinca: Vinca major"
25	"Stems not stoloniferous; corolla white or pink or white with red eye"	"Catharanthus: Catharanthus roseus"
26	"Corolla with corolline corona of lobes at tube mouth"	27
26	"Corolla without corolline corona of lobes at tube mouth"	28
27	"Corolla lobes dextrorse in bud"	"Nerium: Nerium oleander"
27	"Corolla lobes sinistrorse in bud"	Wrightia
28	"Flowers 80-110 mm long; fruit a capsule with long soft spines"	"Allamanda: Allamanda cathartica"
28	"Flowers 3-11 mm long; fruit a follicle without spines"	29
29	"Fruit woody; follicle fusiform"	Alstonia
29	"Fruit fleshy; follicle obliquely ellipsoidal"	"Tabernaemontana: Tabernaemontana orientalis"
30	"Corolla funnel-shaped; fruit pyriform"	"Cascabela: Cascabela thevetia"
30	"Corolla ±salverform; fruit not pyriform"	Alyxia