Ipomcea.] xc. costvolvulace.e (baker and rendle). 



131 



Stem, leaves, and sepals densely hairy 

 Sepals oblong-spathulate, blunt . 



40. /. operosa. 



41. I. pileata. 



43. 1. microcephala. 



44. /. chloroneura. 



45. _Z". argentaurata. 



46. 1. abyssinica. 



47. /. Atherstonei. 



§ 4. Cephalanth^;. — Annual or perennial herbs, low-growing and erect, or 

 climbing, generally hairy. Leaves linear-lanceolate to ovate, or oblong, or orbicular, 

 often cordate, sometimes palmately lobed or partite, hairy especially on the lower 

 surface. Flowers in dense bracteate heads, generally densely hairy. Sepals 

 herbaceous, lanceolate, often resembling the upper bracts. Corolla small, or mode- 

 rate to large. 



Leaves not cordate-ovate. 



Leaves linear-lanceolate. Corolla exceeding 1 in. in 



length ........ 42. I. erepidiformis. 



Leaves elliptic-lanceolate. Corolla less than 1 in. in 

 length ....... 



Leaves oval narrowing equally at both ends. Corolla 



a little longer than the sepals . 

 Leaves oblong with subcordate base. Corolla 2 

 long ....... 



Leaves ovate to oblong. Corolla 1-lg in. long . 

 Leaves ovate. Corolla 2\ in. long . 

 Leaves cordate-ovate, acuminate (subcordate in I. 

 lasiophylla). 

 Bracts foliaceous. 



Corolla barely 6 lin. long ..... 48. I. amoena. 



Corolla li in. long ...... 49. I. velutipes. 



Bracts small, barely exceeding the calyx. 



Corolla 1^ in. long ..... 



Corolla 1 in. long ..... 



Corolla 8 lin. long ..... 



Leaves suborbicular. Bracts large 

 Leaves trilobed. 

 Leaf -base cordate. 



Corolla 2 in. long . . . . . . 54. I. elythrocephala. 



Corolla 1-1 h in. long, rose-red . . . . 55. /. Wightii. 



Corolla less than 1 in. long, white with purple 



throat ........ 56. /. garcheana. 



Leaf-base rcniform ...... 57. I. whyteana. 



Leaves palmatipartite . 58. I. Pes-tigridis. 



§ 5. CHOEiSAXTHiE. — Annual or perennial herbs with slender climbing hairy 

 stems. Leaves cordate-ovate, sometimes 3-lobed or palmatipartite, hairy, especially 

 on the under surface. Peduncles often long, bearing few, several or many flowers 

 in a dense to lax cyme; bracts generally small. Flowers moderate to large. Sepals 

 herbaceous, lanceolate, acute, rarely exceeding 6 lin. in length, hairy and ciliate. 

 Corolla reddish to purple. 



Flowers large. Sepals f-1 in. long. Corolla 2-3 in. long 59. I. hederacea. 

 Flowers smaller. Sepals 4-6 lin. long. Corolla 1-2 in. 

 long. 

 Leaves cordate-ovate, entire. 



Bracts small, shorter than the sepals. 



Hairs on stem white . . . . . . 60. 7. erioleuca. 



Hairs on stem yellow ..... 62. I. Kilimandschari. 



Bracts large . . . . . . • 64. I. pharlitiformis. 



Leaves cordate-ovate. 3-lobed. 



Corolla about 2 in. long . . . . .61. I.ftcifolia. 



Corolla about 1 in. long ..... 63. I. pilosa. 



51. I. chrysochcetia. 



52. I. lasiophylla. 



53. 1. galactorrhea. 

 50. I. climtocaulos. 



