Vol. X, No. 1.] The Dioscoreas of the (Hd World. 11 



[N.S.] 



Veins not inconspicuous : the 

 first lateral pair of nerves 

 rather close to the midrib ; 

 leaves thin curling up on the 

 midrib in drying .. 95. glabra. 



Veins not inconspicuous ; the 

 first lateral pair of nerves 

 remote from the midrib . . 96. vexana. 

 Flowers of the male plant on axes which 

 become zig-zag either in life or when dry. 

 Stems rough with numerous warts; petiole 



short .. .. -. ..97. brevipetiolata. 



Stems not rough ; petioles of moderate length. 



Buds large: leaves ovatp-elliptic . • 98. Benthamti. 



Buds small ; leaves cordate. 



Leaves with the basal sinus rounded as if 

 bitten out ; axes of the spikes very 

 thin ; buds often elongated . . 99. myriantha. 



Leaves with the basal sinus more or less 

 acute. 

 Stems hardly winged, reddish when 

 dry ; root deeply penetrating. 

 Network rather distinct on the under 

 surface of the leaf : capsules equal- 

 ling those of D. alata . - 100. persimilis. 

 Network not so distinct on the 

 under surface of the leaf: cap- 

 suies larger than those of D. alata 101. Hamiltonn. 

 Stems winged ; rarely the wings much 

 reduced but then the root not 

 deeply penetrating . . - • 102. alata. 

 Spikes with a very pronounced negative geotropism . 



Buds rather small. 



Leaves thin but the network becoming just 



prominent below when they are dry . . 103. laurifolia. 



Leaves subcoriaceous. 



Leaves not much longer than broad ; net- 



work distinct . . . . . « 104. Havilandn. 



Leaves more elongated ; spikes long .. 105. Wa>burgiana. 



Buds larger, leaves thin . . • • 106. defleza. 



Section 8. Stenocorea. Tubers unknown. Stem twin- 

 ing to the right. Leaves simple Male flowers in racemes. 

 Perianth tubular, opening wide: stamens 6, inserted in the 

 upper part of the tube, constructed like the stamens oi&teno- 

 meris i.e. swollen below and horned at the back. Female flowers 

 also tubular. Seeds unknown, but 2 ovules present m each 



loculus. 



Only species 



• • 



107. etenomeriflora. 



PART 2. 



Enumeration with diagnoses. 

 Section 1. — Borderea. 



1 D pyrenaica, Bubani et Bordere ex Grenier, in Bull. 

 Soc. Bot. France, xiii. (1866), p. 380. Borderea pyrenaica, 



