Dioscoreae generis species novae septem. gg 



More closely allied to D. sikkimensis than D. deltoidea, is D. Frozen. 

 The chief differences between the two are (i) in the male flowers, which 

 in D. Prazeri are sessile and in D. sikkimemis are distinctly pedicelled, 

 (ii) in the seeds, which are of a different colour and shape, and (iii) in 

 the foliage which is chiefly composed of wide cordate leaves in the 

 Burmese plant, though there are leaves on the ultimate branches which 

 are longer than broad as is the usual condition in the Sikkim plant. In 

 D. sikkimensis such leaves as there may be, which are as long as they 

 are broad, are confined to the lower part of the main stem. The male 

 plant of D. Prazeri is often bulbilliferous: this is a rare condition in D. 

 sikkimensis. The bulbils of both when present are smooth with a silvery 

 skin: the specimen of D. Prazeri collected by one of us at Momouk, east 

 of Bhamo, close to the Chinese frontier, had such silvery bulbils, slightly 

 verrucose, and Haines notes on the ticket of his Duars specimen that it 

 bore bulbils with a silvery smooth skin. 



5. Dioscorea panthaica Prain et Burkill, 1. c. suppl., p. 6. 



Radix ignota. Caules glabri, sinistrorsum volubiles, teretiusculi, ad 

 basin petioli spinis flaccidis stipulinis obsiti, purpurei. Folia alterna, 

 chartacea, supra glaberrima, subtus ad nervos et nervulos papillis minu- 

 tissimis simplicibus densius hirtella, pellucide punctata, subdeltoideo-ovato- 

 cordata, acuminata, apice minutissime mucronulata, basis sinu latissimo, 

 margine plus minus undulata, 7-nervia, nervis extimis profunde bifidis, 

 vel 9-nervia, nervulis secundariis reticulatis parum distinctis, 8,5 cm longa, 

 6 cm lata; petiolus glaber. sulcatus, tenuis, 5 cm longus. Spicae masculae 

 simplices, in paniculas axillares dispositae; flores 2-ni in glomerulis sessili- 

 bus 4 — 6 mm remotis in rhachi nonnunquam minopere angulata ad angulas 

 nonnunquam papilloso-lineolata dispositi; panicula 12 cm longa; spicarum 

 rhachides 4,5 cm iongae; pedunculus paniculae 3 cm longus; bracteae 

 lanceolatae, ad 1,5 mm Iongae; bracteolae ovato-acuminatae, naviculari- 

 concavae, glabrae, floribus breviores. Perianthii masculi laciniae ovato- 

 oblongae, obtusae, subaequales et subsimiles patentes. Stamina 6, aequalia, 

 antherae filamentis multo breviores. Planta feminea ignota. 



South-West China. Yunnan: Mengtse, northern mountains, at 

 7000 feet, A. Henry. 11065. 



This species seems to be most nearly allied to I), deltoidea. 



6. Dioscorea Yokusai Prain et Burkill, 1. c. suppl., p. 10. 



Radix ignota. Caules glabri, sinistrorsum volubiles, minopere angulati, 

 inermes, virides. Folia alterna, membranacea. glaberrima, nitentia. cordato- 

 acuta vel breviter acuminata, apice mucronulata, sinu basis latissimo, 

 margine integra vel plus minus undulata, nonnunquam ad medium con- 

 stricta, 7-nervia, nervis extimis profunde bifidis. nervulis secundariis reti- 

 culatis subtus distinctis, 5 cm longa, 5 cm lata; petiolus glaber, gracilis, 

 supra profunde canaliculars, 3,5 cm longus. Inflorescentia mascula per 

 rhachin angulatam ad 7 cm longam cymulas 3 — 5-floras 5 — 10 mm remotas 

 gerens; flores distincte pedicellati, pedicellis 2 — 3 mm longis; pedunculus 

 glaber, angulatus, 2 — 3 cm longus; bracteae ovato-lanceolatae, acutae vel 



