200. APOCYNACEAE 433 



2. Anthers projecting beyond the mouth of the corolla-tube. [Tribe PAR- 



SONSIEAE.)] 3 



Anthers .entirely or for the greatest part, concealed within the corolla-tube. 

 [Tribe ECHITIDEAE.l 7 



3. Calyx without glands ; segments blunt. Corolla with a very short tube 



without scales ; segments overlapping to the right. Filaments twisted 

 around the style. Disc cupular, irregularly crenate. Twining shrubs. — 



Species I. West Africa (Congo) Dewevrella De Wild. 



Calyx with glands on {he inside. Disc 5-lobed or wanting 4 



4. Disc 5-lobed. Calyx with 5 — 10 glands. Corolla white, with 5 — la 



confluent scales at the throat ; segments overlapping to the right. 

 Seeds glabrous. Trees or erect shrubs, glabrous. — Species i. Northern 



West Africa. Malouetia A. DC. 



Disc absent. Seeds hairy 5 



5. Calyx with pointed segments and 10 — 20 glands. Corolla glabrous at the 



throat ; segments unequal-sided, o\erlapping to the right. Seeds with 

 a terminal and a smaller basal tuft of hairs. Twining shrubs. — Species 



3. West Africa. Isonema R. Br. 



Calyx with blunt segments and 5 — 10 glands. Corolla nearly always with 

 scales at the throat ; segments overlapping to the left. Erect shrubs 

 or trees 6 



6. Flowers small. Seeds covered all over with long hairs densest at the 



base. — Species 5. West Africa. (Under Wrightia R. Br.) 



Pleioceras Baill. 



Flowers rather large. Seeds provided at the base with a deciduous tuft 



of hairs. — Species 3. South-east Africa and Madagascar. Wrightia R. Br. 



7. Leaves alternate. Stem succulent. Flowers subsessile. Calyx without 



glands, with subulate or lanceolate segments. Corolla usually funnel- 

 shaped ; segments overlapping to the right. Ovary superior. . . 8 

 Leaves opposite or whorled. Stem woody 9 



8. Leaves with 2 or more spines at their base or in their axils. Disc 5-lobed or 



replaced by 2 — 5 glands. Seeds with a tuft of hairs at the apex. — 

 Species 15. Madagascar, South Africa, and Angola. Pachypodium Lindl. 

 Leaves and stem without spines. Corolla red. Disc none. Seeds with 

 a tuft of hairs at either end. Flowers large, in few-flowered cjmies. — 

 Species 13. Central and South Africa. Some species 3neld an arrow- 

 poison. {Idaneum O. Ktze.) . . . Adenlum Roem. & Schult. 



9. Corolla with separate or confluent scales at the throat 10 



Corolla naked at the throat, but sometimes with scales or swellings lower 



down in the tube 13 



10. Scales at the throat of the corolla united into a tubular, 15-crenate corona. 

 Corolla salver-shaped, the segments overlapping to the left. Calyx with- 

 out glands. Ovary superior. Seeds with a basal tuft of hairs. Erect 

 shrubs. Flowers small. — Species i. East Africa. 



Stephanostema K. Sc hum. 



2E 



