219- RUBIACEAE 5I7 



7. Flowers solitary or in pairs. Calyx-segments enlarged in the fruit. 



Corolla glabrous at the throat. Anthers included. Style long, glabrous, 



two-cleft at the apex. — Species 6. Central Africa. Psilanthus Hook. fil. 



Flowers in fascicles or panicles. Calyx-segments not enlarged in the 



fruit 8 



8. Flowers in terminal panicles. Corolla hairy at the throat. Anthers 



exserted. Style downy above. Shrubs 9 



Flowers in axillary fascicles or panicles 10 



9. Calyx shortly lobed. Corolla white, funnel-shaped, 6 — 7-cleft. Style- 



apex 2-cleft. — Species r. East Africa. . Lamprothamnus Hiern 

 Calyx deeply divided. Corolla yellow, salver-shaped, 4-cleft. Style-apex 

 entire. — Species i. Equatorial West Africa (Cameroons). 



Exechostylus K. Schum. 



10. Style hairy ii 



Style glabrous 12 



11. Calyx 4-toothed or truncate. Style-apex 2-cleft. Albumen of the seeds 



ruminated. Bracteoles 4, one pair united into a cup. — Species 10. 



Tropics Polysphaeria Hook. fil. 



Calyx 5-toothed or 5-cleft. Anthers exserted. Style-apex entire. Albu- 

 men of the seeds uniform. Bracteoles free. — Species 13. Tropics. 



Cremaspora Beiith. 



12. Style short, with 2 long stigmas. Sepals free above the ovary. Corolla 



salver-shaped, glabrous at the throat. Anthers included. Trees. 

 Flowers subtended by 2 — 3 pairs of bracteoles. — Species i. Island 



of St. Thomas Belonophora Hook. fil. 



Style long, with 2 short stigmas or with a single stigma 13 



13. Style-apex 2-lobed. Corolla glabrous at the throat, but sometimes hairy 



below 14 



Style-apex entire, spindle-shaped, lo-ribbed. Flowers 5-merous. Anthers 

 more or less exserted 15 



14. Flowers 4-merous. Sepals free above the ovary. Corolla salver-shaped. 



Anthers included. Flowers surrounded by 4 pairs of bracteoles. — 

 Species I. West Africa (Togoland). , . . Kerstingia K. Schum. 

 Flowers 5-merous. Sepals united above the ovary. Corolla funnel- 

 shaped. Anthers exserted. — Species 4. West Africa. 



Aulacocalyx Hook. fil. 



15. Corolla bell-funnel-shaped, glabrous at the throat. Stipules very narrow. 



Species 2. East Africa Heinsenia K. Schum. 



Corolla bell-wheel-shaped, hairy at the throat. Stipules broad. — Species 

 3. East and South-east Africa. . . . Rhabdostigma Hook. fil. 



16. (4.) Flowers in heads. Calyx 4-toothed. Ovary 2-celIed. Fruit separat- 



ing into two leathery nutlets. Seeds with a thick aril and copious 

 albumen. — Species 3. West Africa, Madagascar, Natal. 



Cephalanthus L. 



