8 Journal of the Asiatic Society of Bengal. [January, 1914. 



Leaflets narrow . . . . 39. melanophyma. 



Leaflets broader . . . . 40. kamoonensis . 



Leaflets broadly ovate . > . 41. tamarisciflora. 

 Leaflets relatively large. 



Plant hispidly hairy . . . . 42. Pierrei. 

 Plant not hispidly hairy. 



Leaflet 



43. pentaphylla. 



Leaflets 5 or 6 or 7, often irregularly 

 divided; tubers descending rather 

 deeply . . . . . . 44. Kalkapershadti. 



Capsules 25 mm. long or longer . . . . 45. Elmeri. 



Capsules at maturity standing at a right angle to 

 the dependent axis. 

 Leaflets not truncate under the acumen. 



Capsules with margins rounded . . 46. inaequifolia. 



Capsules with margins rather rectangular. . 47. Cumingii. 

 Leaflets truncate under the acumen: cap- 

 sules unknown in D. Blumei, rectangular 

 in D. Scortechinii. 

 Lower surface of leaf with a few hairs and 



petiole bristly .. .. ..49 Blumei 



Lower surface of leaf and petiole glabrous 50. Scortechinii. 

 Male flowers densely packed : stamens 6 . . 51. triphylla. 



Section 6. Opsophyton. Tubers vertical, containing 

 dioscorine in varying quantity. Stems twining to the left. 

 Leaves simple, cordate. Male flowers in characteristic depen- 

 dent spikes : perianth-lobes free, with the stamens inserted at 

 their bases : filaments simple. Seeds with the wing developed 

 on one side only, in elongated reflexed capsules. 



Leaves alternate. 



Leaves ovate-cordate, drying green ; flower-spikes 

 long. 



Tuber not or little elongat d . . . . 52. bulbifera. 



Tuber much elongated . . . 53. Rogersii. 



Leaves deltoid: flower-spikes shorter, much 



branched ; tuber unknown . . . . 54. Brandisii. 



Leaves apposite ; tuber unknown .'*. . . 55. punctata. 



Section 7. E^antiophyllum. Tuber vertical, usually 

 edible. Stems twining to the right. Leaves simple. Male 

 flowers sessile on short axes, opening but a little way : 

 perianth. lobes free, with the stamens inserted at their bases : 

 filaments simple. Seeds winged all round, in capsules which 

 are not reflexed, but face forwards. 



Male flowers in axillary spikes and not on special 

 leafless branches (Xos. 56 to 69). 

 Auricles of the leaves set on obliquely, so that 



the margin of the leaf presents a sinus above 

 them. 



Auricles very oblique. 



Leaves relatively large .. ..56. Batatas. 



Leaves smaller . . . . . . 57. doryophora. 



Auricles slightly oblique . . . . 58. japonica. 



Auricles of the leaves not set on obliquely, or only 



inconsistently so. 



