44 DIOSCOREACE^. 



Dioscorea raishaensis Hayata sp. nov. (Rg. 23). Volubilis; caulis 

 complanato-teres glaber. Folia opposita chartacea oblongo-ovata 9-12 cm. longa 

 5^-8 cm. lata apice cuspidato-acuminata basi cordato-auriculata integra 7-nervia 

 utraque glabra, petiolis 6-7 cm. longis gracilibus glabris. Paniculae axillares 

 15-20 cm. longae 3-4 cm. latse, ramis paniculae ad nodos verticillatis 2-3 cm. longis 

 simplicibus valde flexuosis glabris flores spicatim gerentibus. Fl. J : sessiles 

 basi 1-bracteati, bracteis singularibus triangularibus 1 mm. longis l^ mm. 

 latis apice cuspidatis latere bracteolis singulis minutis instructis. Segmenta 

 perianthii 6 ; exteriora 3 majora oblonga concava 1} mm. longa 11 mm. lata 

 apice obtusa glabra, interiora crassiuscula obovato-rhomboidea l^ mm. longa 

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

 floris congesta subsessilia, antheris rotundatis utrinque emarginatis. Rudi- 

 mentum ovarii minutum, Fl. ? ignoti. 



Hab. Ako : Raisha, leg. Y. Matsuda, Nov. 1917. 



Near Dioscm'ea ja/ponica Thunb. ; but dififers from it in the paniculate 

 maJe spikes. 



Dioscorea sativa Linn. (Fig. 24); Hayata Gen. Ind. p. 84. 



Hab. Takaw, Nanto : Batsu-sha-ho ; Urai, Kusshaku. 



Dioscorea tarokcensis Hayata sp. nov. (Fig. 25). VolubiHs ; caulis com- 

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

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

 l|^-2cm. longis glabris. Flores ignoti. Spicae fructiferse circ. 10 cm. longaei 

 Capsulse cum alis ob-reniformes 3 cm. latee 2 cm. longse apice obcordatse basi 

 truncatse ad centrmn subito acutse, stipitibus 1 mm. longis. Semina valde com- 

 planata. 



Dioscorea glah-a Hayata Gen. Ind. p. 84 (non RoxB.). 



Dioscorea qpposiU/olia Hayata Gen. Ind. p. 84 (non LiNN.). 



Hab. Taroko, leg. G. Nakahaea, Jan. 1906. 



Near Dioscorea rhipogonoides Oliv. ; but differs fi"om it in having much 

 thinner leaves; also allied to D. 3Iatsudai 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). Vohibilis ; cauHs teres 

 glaber exalatus. FoHa altema membranacea cordato-ovata 8-15 cm. longa 



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