Vol. X, No. 1.] The Dioscoreas of the Old World. 13 



[N.S.] 



inclusa ad 30 mm. longae, supra truncatae : alae obliqua? 20—22 mm. 

 longso, 17 — 18 mm. latae. Semina pallida mombrana circumcirca alata. 



Borneo. — In principatu Sarawak ad Bau, Ridley, 11710! sine loco, 

 mercenarius Merrillii, 1278 ! Typi conservantur in Herbariis Horti 

 Botanici ad Singapur et Scienti;»> < uiservatorii ad ]\Ianilam. 



6. D. birmanioa, Prain et Burkill, in Journ. Asiatic Soc. 

 Bengal, lxxiii. (1904), p. 185. Common in the forest-clad parts 

 of Burma, except the Arakan coast, and extending thence into 

 Yunnan and Northern Siam. 



7. D. sp., Prain et Burkill, in Journ. Asiatic Soc. Bengal, 

 lxxiii. (1904), p. 186: Ridley, Mat. Flor. Malay Penins., ii. 

 (1907), p. 84. "Tuba ubi," Ridley, in Agric. Bull. Straits 

 Settlements and F. M. States, 1908. p. 444. Perak in the Malay 

 Peninsula. 



8. D. membranacea, Pierre MS. A very marked species 

 occurring in three isolated localities in Burma, Northern Siam 

 and near the Gulf of Siam. 



Dioscorea membranacea. Rhizoma horizontale, externe atro-cas- 

 taneum. Caules siccitate flavescentes, longitudinaliter strinti, ad bases 

 foliorum nonnullorum inferiorum bispinosi, supra inermes, glabri. 

 Folia alterna, ex basi cordata trifida, ad 26 cm. longa et 21 cm. lata, 

 glabra, 9 nervia, nervis tribus in apicem lobi medii incurrentibus et 

 aream internerviam elliptico-ovatam includentibus, nervorum paribus 

 secundis et tertiis in apices loborum lateralium incurrentibus; nervorum 

 pari quarto tenue et in iornices effoeto : venae secundariae aliquomodo 

 irregulares, supra subdistinctse, infra distinctis>imae ; petiolus canali- 

 culatus, ad 18 cm. longus. Flores maris singuli vel bini in racemos 

 spiciformes dispositi (si bini Bint junior in pedicello vetustioris insi- 

 dens): pedicelli *5 mm. longi : bracteae singulae vel binae, glabrae, tenuis- 

 simse, basalis ovato-acuminata, superior minor obtusior : bracteolae 

 minimae. Perianth tt maris lacinise 1 mm. longap, subligulatae, obtusae : 

 tubus campanulatus, glaber, 1 mm. longus, intra quinque-costatus ob 

 filamentis adnatis. Stamina 6: filamenta in marginem tubi inserta, 

 •3 mm. longa. Flores /ceminei in spicas dependentes ad 20 cm. longas 

 dispositi: bracteae ovatae, acutse, tenuissimae, 1-5 mm. longae; bracteolae 

 similes, minores. Sepala obovata, obtusa, carinata, glabra, 1 mm. longa 

 et ultra. Petala lanceolato-acuta, sepalis breviora. Staminodia minuta. 

 Capsulce reflexae, ai 18 mm. longae, apice subtruncatae : alae paullulo 

 latiores quam semicirculares, 12 mm. latae. 



Burma et Siam et Ixdo-China. — Ad Gangaw in districtu Pakokku 

 Burmse superioris, Millar in Mus. K. E. P., 20632! 20633! 20634! In 

 monte Dinh praefecturae cambodianae B aria, Pierre, 7017! Ad Vaton in 

 litore maris Siamensis, Pierre, 7018/205 ! Prope Chengmai ad Meh-hia, 

 Ke<r, 1951 ! et in monte Doi Sutep, ad 1200 ped. ale, Kerr, 1245 ! Typi 

 Pierreani in Herbario Horti Botanici ad Lutetias Parisiorum conser- 

 vantur : exempla omnia masculina. Flores fceminei in herbario Kewen3i 

 conservantur ex coliectione Kerriaaa. Kadix nobis nota e*t ex exumplis 

 vivis ad Horcum Botanicura Calcuttensem a Millar benevolenter missis. 



9. D. kipponica, Makino, Illustr. Flor. Jap. 1. (1891) 

 t. 45. D. aceri folia, Uline ex Diels, in Engl. Bot. Jahrb., xxix. 

 (I £00), p. 261 : Prain et Burkill, in Journ. Asiatic Soc. 



