1904.] D. Plain & I. H. Burkill— On Bioscorea deltoidea, etc. 3 



late cordata vel sursum ovato-cordata, acuminata, apice minutis- 

 sime mucronulata, basis sinu lato vel latissimo, margine nonnunquain 

 plus minusve undulata, 7- vel 9-nervia, nervis extiniis profunde bifidis, 

 nervulis secondariis reticulatis utrinque distinctis, plurima 8-12 cm. 

 longa 10-16 cm. lata, nonnunquam tamen ad 20 cm. longa lataque : 

 petiolus glaber, sulcafcus, 4-7 cm. longus. Spicm masculse simplices 

 (rarius singulae saepius 2-6-n88) vel paniculatas, axillares ; flores glo- 

 merati, 2-3- ni, sessiles in rhachi trigona sparsim sed fere prorsus dis- 

 positi : pedunculus glaber : bracfceae sub ramulis panicularum lanceo- 

 latas 3mra. longae, sub glomerulis floram ovato-lanceolatas : bracteolse 

 ovato-acumiuatas, naviculari-concavaD. Ferianthii masculi lacinise 

 ovatae, obfcusae, subaequales et subsimiles, patentes. Stamina 6, aequalia, 

 filamenfcis aequilonga : anfcheras filamentis multo breviores. S'picse 

 feminese axillares, solitariae, simplices, ad 12 cm. longse, dependentes ; 

 flores ad 10-12, sessiles, deorsum spectantes, circiter 1 cm. remoti: 

 bracteae et bracteolae adsunt. Gapsulde sessiles, assurgentes : alae 

 matures pergamentaceas, irregalariter subquadrato-semicirculares, 2*5 

 cm. longae, 15 cm. latae, stramineo-coraege, glaucescentes. Semina iu 

 loculo quoque gemina, ovato-oblonga, '85 cm. lata, 1*25 cm. longa 

 circumcirca alata, rufo-brunnea. 



Northern Burma. Upper Chindvvin District : Sittaung, Prazer. 

 Bhamo District: Bhamo, Burkill in herb. R.E.P. 21537 ; Momouk, east 

 of Bhamo, Burkill in herb. R.E.P. 21507, 21509, 21514. Katha Dis- 

 trict : Katha, in forests on black soil, Burkill in herb. R.E.P. 21557, 

 22493, 22494, 22495, 22496, 22652, 22658, 22664, 22665. 



In the districts of Bhamo and Katha this Dioscorea occurs in the forests of Dip- 

 terocarps. 



Dioscorea sikkimensis. Rhizoma crassum, aliquanto informe, parura 

 hypogaeum, venenosum, carne luteo-albo. Oaulis e radice singulus, 

 glaber, sinistrorsum volubilis, teretiusculus, inermis, purpureo sufBus- 

 us, bulbifer (an semper ?). Folia alterna, chartacea, utrinque glaber- 

 j'ima, subtus laete viridia, pellucide punctata, subdeltoideo-ovato-cor- 

 data vel late cordata, acuminata, apice minatissime mucronulata, basis 

 sinu lato vel latissimo, margine nonnunquam plus minusve undulata, 

 7- vel 9-nervia, nervis extimis profunde bifidis, nervulis secondariis 

 reticulatis utrinque distinctis, plurima 9-16 cm. longa, 7-9 cm. lata 

 nonnunquam tamen usque ad 20 cm. longa lataque : petiolus glaber, 

 sulcatus, 4-7 cm. longus. Spicse masculse simplices vel rarius pani- 

 culatae, singulae vel binae vel ternae, axillares : flores glomerati, 2-3-ni, 

 breviter pedicellati, glomerulis in iliachi trigona 2-4 mm. distantibus : 



