690 



1919, p. 159 (tuber); March 31st, 1917, tt. 1-6 (tubers— various 

 races). 



■ r ^ hi- 



Vernac. names. -^Doysb (Hausa, Dalziel) ; Ube (Malaya, 

 BurJcitl) ; Inhame de St. Thome (W. Africa, Pram & Biirhill) : 

 Eeuter Yam, Ben Yam (Tobago, Broadway)) [Flour Yam, 

 Bragging Tom, Silver, Two Sisters Hard, Cap, Pinguin, Duck, 

 Oblong Hard, Snake, Pucka, Bullet Tree Hard, Red, Moonshine 

 or Guinea Yam (Jamaica) Harris] ; Baba-ou-Ie (Dominica, 

 J ones) ; Water Yam (Tortola, Virgin Isles, Fishlock) ; Snake 

 Yam (Trinidad, Hari); Barbados Yam {Watt, Harris); The 

 Wing-stalked Yam, Greater Yam, White Yam, Water Yam, 

 Ten Months Yam {BtirJcill), White Manila Yam. 



Cultivated in Nupe (Barter, No. 1534, Herb. Kew), Aguku 

 District, S. Nigeria (Thomas, Herb. Kew), West Tropical Africa 

 and probably more or less throughout Tropical Africa, in the 

 West Indies, India, Burma, Assam, Ceylon, Polynesia and 

 Mascarene Islands (Kew Bull. 1912, p. 407). 



It is the commonest of all the cultivated yams in India 

 (Watt, Comm. Prod. India, p. 492) and of all species it is the 

 yam mobt cultivated in Indo-Malaya (Burkill, I.e. Nov. 11th, 

 1918, p. 87), also commonly cultivated in the West Indies; 

 but in Nigeria and West Africa it does not appear to be so 

 common. This yam has very riiany races (I.e. Aug. 12th, 1918, 

 gp. 37-44). The cKmbing stems are winged and the roots 

 usually very large. Tubers are described by Watt (I.e.) as 

 sometimes 4-8 ft. in length and as thick as the thigh, at other 

 times small and globular like an average sized potato; several 

 race^ are shown by Burkill (I.e.) to have similar variable 

 characters and some of the " Water Yams " are stated by Barrett 

 (Philippine Agric. Rev. 1912, p. 69) to weigh from 10*25 kg. 

 A particularly large tuber of the " White Manila Yam " grown 

 in Singapore, weighed 29 lb. after being nine months in the 

 ground (Burkill, I.e. Sept. 12th, 1919, p. 158). 



Bef. — *' Some Notes on PhiHppine Yams," Burkill, in The 

 Gardens Bull. Straits Settlements, i, Aug. 31st, 1915, Dioscorea 



alata, pp. 297-302. "Different Parts of the Tubers of 



Dioscorea alata Sprout at Different Rates,'' I.e. pp. 306-307.^ — — 

 " A Report on Races of the Greater or Ten Months Yam, 

 Dioscorea alata, Cultivated in the Botanic Gardens, Singapore," 



Idem, i. March 31st, 1917, pp. 371-396; pis. i. vi. " A Report 



upon the Experimental Cultivation of the Greater Yam, Dios- 

 corea alata, in 1917," Idem, I.e. ii. Aug. 12th, 1918, pp. 37-44, 



illustrated. *' A Progress Report on the Cultivation of the 



Greater Yam, Dioscorea alata,'' Idem, I.e. July 4th, 1919, 

 pp. 129-135. 



Dioscorea bulbifera. Harms,; Fl. Trop. Air. VII, p. 415. 



{D. sativa, Linn. I.e. p. 415), 



///.— iVnnals of Botany, London, xv. 1901, t. 26 (development 

 of aerial tubers — D. sativa); ^ Duthie, Field Crops, iii. t. 80 

 (Z). saliva). 



