44 DIOSCOKEACE^E. 



Dioscorea raishaensis HAYATA sp. uov. (Fig. 23). Volubilis ; caulis 

 coniplanato-teres glaber. Folia opposita chartacea oblongo-ovata 9-12 cni. longa 

 5| 8 cm. lata apice cuspidato-acumiuata basi cordato-auriculata Integra 7-nervia 

 utraque glabra, petiolis 6-7 cm. lougis gracilibus glabris. Paniculic axillares 

 15-20 cm. longte 3-4 cm. latpe, ramis paniculse ad nodes verticillatis 2-3 cm. longis 

 simplicibus valde flexuosis glabris flores spicatim gereutibns. Fl. : sessiles 

 basi 1-bracteati, bracteis singularibus triangularibus 1 mm. longis 1| mm. 

 latis apice cnspidatis latere bracteolis singnlis minutis instructis. Segmenta 

 perianthii 6 ; exteriora 3 majora oblouga concava 1J mm. longa 1| mm. lata 

 apice obtusa glabra, interiora crassiusciila obovato-rhoiuboidea 1 mm. longa 

 totiusque lata apice triangulari-obtusa basi cuneata. Stamina 6 ad centrum 

 floris congesta subsessilia, antheris rotmidatis utrinque emargiuatis. Rudi- 

 mentum ovarii minutuni. Fl. ignoti. 



HAB. Ako : Eaislia, leg. Y. MATSUDA, Nov. 1917. 



Near Dioscorea japomca THUNB. ; but differs from it in the paniculate 

 male spikes. 



Dioscorea sativa LINN. (Fig. 24) ; HAYATA Gen. Ind. p. 84. 



HAB. Takaw, Nanto : Batsu-slia-ho ; Urai, Kusshaku. 



Dioscorea taroko3nsis HAYATA sp. nov. (Fig. 25). Volubilis ; caulis com- 

 plauato-teres glaber. Folia opposita oblonga chartacea 6-7 cm. longa 2| 3 cm. 

 lata apice cuspidato-acuminata basi rotundata 5-nervia margine integra, petiols. 

 1 1-2 cm. lougis glabris. Flores ignoti. Spicae fructiferce circ. 10 cm. lougfei 

 Capsulre cum alis ob-reniformes 3 cm. latae 2 cm. longce apice obcordatpe basi 

 truncate ad centrum subito acutae, stipitibus 1 mm. lougis. Seniiua valde com- 

 planata. 



Dioscorea glabra HAYATA Gen. Ind. p. 84 (non ROXB.). 



Dioscorea opposiiifolia HAYATA Gen. Ind. p. 84 (11011 LINN.). 



HAB. Taroko, leg. G. NAKAHAKA, Jan. 1906. 



Near Dioscorea rhipogonaides OLIV. ; but differs from it in having much 

 thinner leaves; also allied to D. Matsudai HAY., but distinguishable from it 

 in the leaves with finer veinlets which are not visible on the upper side. 



Dioscorea Tashiroi HAYATA sp. nov. (Fig. 26). Volubilis ; caulis teres 

 glaber exalatus. Folia alterna membranacea cordato-ovata 8-15 cm. longa 



