Dioscoreae generis species novae septem. Q\ 



spicae versus spectantes; bracteae bifariae, alternae, extus dense glabres- 

 centes, intus glabrae, 1—5 mm longae, brunneo-lineolatae: bracteolae 0. 

 Perianthii masculi campanulati lobi brunneo-lineolati. subaequales, ovato- 

 acuti. Stamina 6, aequalia, perianthii lobis breviora: filamenta antheras 

 subaequantia. Spicae femineae flores 6 — 12 sessiles alternatim gerentes; 

 bracteae extus dense pubescentes: bracteolas non vidimus. Perianthii 

 feminei lobi iis floris masculi similes. Ovarium densissime pubescens, 3 — 6- 

 costatum. Fructus maturae ignotae, post anthesin teste ovario gravido 

 ad caelum versus respicientes. 



China: Yunnan; Mengtze, in woods at 4600 and 5000 feet, A. Henry, 

 9288 and 9288 A. 



This species differs from D. birmanica in the more pubescent leaves, 

 in the equal perianth-segments and in the filaments. 



3. Dioscorea Prazeri Prain et Burkill, 1. c. suppl., p. 2. 



Rhizoma crassum, aliquanto informe, parum hypogaeum, venenosum, 

 carne albo. Caulis e radice singulus, glaber, sinistrorsum volubilis, teretius- 

 culus, inermis, viridis, bulbifer. Folia alterna, chartacea, utrinque glaber- 

 rima. subtus glauca. pellucide punctata, late cordata vel sursum ovato- 

 cordata, acuminata, apice minutissime mucronulata, basis sinu lato vel 

 latissimo. margine nonnunquam plus minusve undulata, 7- vel 9-nervia, 

 nervis extimis profunde bifidis, nervulis secundariis reticulars utrinque 

 distinctis, plurima 8 — 12 cm longa 10 — 16 cm lata, nonnunquam tamen 

 ad 20 cm longa lataque; petiolus glaber, sulcatus. 4 — 7 cm longus. Spicae 

 masculae simplices (rarius singulae saepius 2 — 6-nae) vel paniculatae, 

 axillares; flores glomerati, 2 — 3-ni, sessiles in rhachi trigona sparsim sed 

 fere prorsus dispositi; pedunculus glaber; bracteae sub ramulis pani- 

 cularum lanceolatae 3 mm longae, sub glomerulis tlorum ovato-lanceolatae; 

 bracteolae ovato-acuminatae, navicular}- concavae. Perianthii masculi la- 

 ciniae ovatae, obtusae, subaequales et subsimiles, patentes. Stamina 6. 

 aequalia, filamentis aequilonga; antherae filamentis multo breviores. Spicae 

 femineae axillares, solitariae, simplices, ad 12 cm longae, dependentes; 

 flores ad 10 — 12, sessiles, deorsum spectantes. circiter 1 cm remoti; bracteae 

 et bracteolae adsunt. Capsulae sessiles, assurgentes; alae maturae perga- 

 mentaceae, irregulariter subquadrato-semicirculares, 2,5 cm longae, 1,5 cm 

 latae, stramineo-corneae. glaucescentes. Semina in loculo quoque gemina. 

 ovato-oblonga. 8,5 cm lata, 1,25 cm longa. circumcirca alata, rufo-brunnea. 



Northern Burma. Upper Chindwin 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 District: 

 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 Dipterocarps. 



4. Dioscorea sikkimensis Prain et Burkill, 1. c. suppl., p. 3. 



Syn.: Dioscorea deltohha Hook. f.. Fl. Brit. Ind. VI (1892). 291, partim. 



Rhizoma crassum. aliquanto informe, parum hypogaeum. venenosum, 



