64 XC. CONVOLVULACEiE (BAKER AND EENDLE). 



2 outer sepals much longer than the inner . . 5. Hildebrandtia. 



All the sepals accrescent . . . . .6. Cladostigma. 



Tribe III. Poraneae. — Flowers generally small and racemose or panicled (in 

 sessile or subsessile axillary cymes in Prevostea). Bracts or sepals accrescent. 

 Corolla various. Stamens generally included. Styles 2 or single and bifid. Fruit 

 one-seeded. — Climbing shrubs. 



* Bracts accrescent . 10. Neuropeltis. 



**2 outer sepals accrescent. 



Style unequally bifid, rarely divided to the middle ; 



stigmas ellipsoid to globose .... 11. Prevostea. 



Style deeply bifid ; stigmas linear-oblong . . 12. Dipteropeltis. 



***Sepals not accrescent ...... 13. Porana. 



Tribe IV. Convolvulese. — Floivers axillary, solitary or dichasial. Sepals 

 free, rarely accrescent. Corolla funnel-shaped, subentire ; midpetaline areas not 

 well defined ; aestivation contorto-plicate. Stamens and style included. Filaments 

 dilated at the base and glandular hairy. Ovary 2-celled, 4-ovuled. Style long,, 

 entire. Fruit a valvate capsule, 2-celled, 4-seeded, rarely with opercular or irre- 

 gular dehiscence or indehiscent. 



*Flower subtended by a pair of large foliaceous bracts 17. Calystegia. 



* Flowers not thus subtended. 



fOuter sepals not conspicuously larger than the 

 inner. 

 Stignnis elliptic . . . • .14. Jacquemontia. 



Stigmas filiform . . . - . .16. Convolvulus. 

 Stigma biglobular. 



Capsule dehiscent, several seeded . . 19. Merremia. 



Capsule indehiscent, 1-seeded . . .20. Hyalocystis. 



ffOuter sepids conspicuously larger than the inner. 



Stigma biglobular 15. Aniseia. 



Stigmas ovate-oblong 18. Hewittia. 



_B. Pollen grains spinose. 



Tribe V. Ipomoeeae. — Flowers axillary, solitary or in few- to many-flowered 

 cymes, often large and showy. Sepals sometimes much enlarged in fruit. Corolla 

 generally funnel-shaped, sometimes more or less campanulate, hypocrateriform or 

 urceolate (Lepistemon); midpetaline areas ivell defined; cestivation contorto- 

 plicate. Stamens and styles included, or sometimes exserted. Filaments with 

 dilated glandular-hairy base. Ovary generally 2-celled and 4-ovuled. Style simple ; 

 stigma capitate, entire or bilobed, rarely oblong. Fruit generally a 4-valved 

 capsule. — JLabit various. 



*Stamens springing from the base of 5 scales. 



Corolla urceolate 21 . Lepistemon. 



Corolla campanulate 22. Lepistemonopsis. 



**Stamens not attached to scales. 



Pedicel accrescent 23. Calonyction. 



Pedicel not accrescent. 



Plants stellately hairy 24. Astrochl^na. 



Plants not stellately hairy. 



Corolla hypocrateriform, scarlet ; genitalia 



exserted ; ovary 4-celled . . .25. Quamoclit. 



Four above characters not associated . . 26. Ipomcea. 



Tribe VI. Arg-yreiese. — As in Ipomoeeae, but fruit indehiscent, ivith fleshy or 

 woody pericarp. 



Only Tropical African genus 27. Argyreia. 



