Vol. X, No. 1.] The Dioscoreas of the Ohl World. 



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[N.S.] 



Flowers large 

 Flowers small. 



Leaves almost as broad as long, cordate. 

 Buds sessile on a broad base. 

 Capsules truncate above 

 Capsules obtuse above 

 Buds with a narrow base . . • • 



Leaves longer than broad 



Network of veins very prominent. 



Leaves with the first pair of nerves 



near the midrib 

 Leaves with the first pair of nerves re- 

 mote from the midrib 

 Network of veins not prominent. 

 Leaves ovate-cordate, drying dark 

 Leaves triangular- cordate 

 Leaves ovate-elliptic with horn- 

 coloured margins 

 Leaves linear- hastate 

 Male flowers in spikes simple in the weaker leaf axils, 

 but in the stronger axils disposed in pyramidal 

 panicles. 

 Plant of moderate growth ; flowers also of 



moderate size ; root edible . . * 



Plant of large growth, with large flowers; root 

 inedible 

 Male flowers in spikes arranged on elongated leafless 

 branches (Xos. 72 to 106). 

 Spikes of male not strongly negatively geotro- 

 pic, but taking a position at a right angle or 

 slightly less to the leafless branch. 

 F owers on male plant on axes which are never 

 zig-zag alive or dry ; buds generally flat- 

 tened at the base (Nos. 72 to 96). 

 Special flowering branches conspicuously 

 shorter than the leaves (unknown in D. 



pulverea). 

 Capsules not very oblique, often rather 



glaucous 

 Capsules very oblique and very glaucous . . 

 Special flowering branchas, when well grown, 

 longer than the leaves. 

 Pubescence of the plant abundant on the 

 leafless axes which bear the spikes of 

 male flowers. 

 Stamens 3 



Stamens 6 



Male flowers 1 — 2 mm. apart. 



Leaves with floccose hairs below . . 

 Leaves without floccose hairs below 

 Male flowers closely packed, touching 

 or almost touching (unknown in 

 D. Ltsteri). 

 Hairs enwrapping the male flowers. 

 Capsule wings 22 by 14 mm. 



Capsule wings 36 by 30 mm. 



Pubescence rather restricted ; 



large bulbils produced 



Pubescence general 

 Hairs not enwrapping the male 



flowers. 



59. luzonen 



GO. peperoides 



61. bicolor. 



62, aapersa. 



03. apicata. 

 64. intermedia. 



65. 

 60. 



67. 

 69. 



72. 

 73. 



T rime nii. 

 Wightii. 



oppoaiti folia 

 haati folia. 



70. transversa. 



71. cirrhoaa. 



Wallichii. 



pulverea. 



74. decipiens. 



75. orbiculata. 



76. Zollingeriana 



77. anguina. 



78. Liateri 



79. polycladea 



