22. 



I. tenuirostris. 



27. 



I. (Enotherce.. 



28. 



I. adumbrata. 



130 xc. convolvulace^e (baker and rendle). [Ipomcea. 



Sepals 2 lhi. long, linear ..... 15. I. recta. 



Sepals 3 lin. long, narrowly ovate .... 16. I. mweroensis. 



Sepals 4-6 lin. long. 

 Sepals linear or lanceolate. 



Corolla 2 in. long . . . . . . 17. I. blepliarophylla. 



Corolla li in. long. Flowers solitary. Leaves 



elliptic-lanceolate ..... 18. I. Debeerstii. 



Corolla 1^ iu. long. Flowers ternate. Leaves 



ovate or subovate ..... 19. I. Paiditschkei. 



Corolla 1 in. long. Flowers in lax cymes. Leaves 



oblong-hastate ...... 36. I. liindeana. 



Sepals ovate or ovate-lanceolate (at least the outer) 

 (elliptic in T. Scotellii). Corolla generally 

 about 1 in. long. 

 Flowers not capitulif orm . 

 Leaves cordate at the base. 

 Flowers solitary or geminate. 



Stem trailing ; sepals i in. long . . 21. I. asperifolia. 



Stem climbing ; sepals § in. long . . 24. I. hypoxantha. 



Flowers in sessile diehasia . . . 26. I. Scotellii. 



Flowers in dense (rarely lax) many-flowered, 

 long-stalked cymes .... 



Leaves linear to linear-oblong, narrowed to 

 the base ...... 



Leaves with truncate or subhastate base 

 Flowers crowded in small heads. 



Corolla 1 in. long 23. I.fulvicaulis. 



Corolla 2 in. long . . . . . 25. I. heiuittloides. 



Sepals 9 lin. long, the outer ovate. 



Flowers in a bead, on rather long peduncles. 



Corolla If in. long . . . . 20. I. porrecta. 



Flowers solitary. Corolla 2J in. long . . 29. I. Randii. 



Outer sepals ovate with a cordate or truncate base. 

 Stems procumbent. 



Sepals 4 lin. long. Corolla a little over 1 in. 



lone ....... 31. I. convolvirfifolia. 



Sepals 6-9 lin. long. Corolla li-2 in. long . 32. I. crassipes. 

 Stems climbing. 



Corolla 8 lin. long . . . . . 30. I. haclceliana. 



Corolla 2 in. long . . . . . 37. I. heterosepala. 



Outer sepals with auricled base. 

 Bracts minute. 



Corolla 6-8 lin. long 33. J. cardiosepala. 



Corolla about H in. long . . . . 34. I. mombassana. 

 Bracts foliaceous 35. I. cordofana. 



§ 2. DASTCHiETiA. — Perennial, prostrate or erect, strigose or woolly plants. 

 Leaves more or less ovate to obovate, entire. Flowers solitary or few, moderate to 

 large. Sepals lanceolate with a long slender tip, densely ciliate or woolly. 

 Only Tropical African species ..... 38. I. linosepala. 



§ 3. InvoltjcraTjE. — Climbers, with generally a hairy stem and cordate-ovate 

 hairy leaves. Flowers in a dense head subtended by a leafy boat-shaped bract. 

 Sepals lanceolate, acute. 



Stem finely hairy or glabrescent ; sepals glabrescent 



or sparsely hairy on back . . . . 39. i". involucrata* 





