44 DIOSCOREACER. 
Dioscorea raishzensis Hayata sp. nov. (Fig. 23). Volubilis; caulis 
complanato-teres glaber. Folia opposita chartacea oblongo-ovata 9-12 cm. longa 
51-8 cm. lata apice cuspidato-acuminata basi cordato-auriculata integra 7-nervia 
utraque glabra, petiolis 6-7 cm. longis gracilibus glabris. Paniculw axillares 
15-20 cm. longze 3-4 cm. late, ramis panicule ad nodos verticillatis 2-3 cm. longis 
simplicibus valde flexuosis glabris flores spicatim gerentibus. Fl. 7: sessiles 
basi 1-bracteati, bracteis singularibus triangularibus 1mm. longis 13 mm. 
latis apice cuspidatis latere bracteolis singulis minutis instructis. Segmenta 
perianthii 6; exteriora 3 majora oblonga concava 14mm. longa 1} mm. lata 
apice obtusa glabra, interiora crassiuscula obovato-rhomboidea 14 mm. longa 
totiusque lata apice triangulari-obtusa basi cuneata. Stamina 6 ad centrum 
floris congesta subsessilia, antheris rotundatis utrinque emarginatis. Rudi- 
mentum ovarii minutum. FI. $ ignoti. 
Has. Ako: Raisha, leg. Y. Matsupa, Nov. 1917. 
Near Dioscorea japonica THUNB.; but ‘differs from it in the paniculate 
male spikes. 
Dioscorea sativa Linn. (Fig. 24); Hayata Gen. Ind. p. 84. 
Has. Takaw, Nantd: Batsu-sha-ho; Urai, Kusshaku. 
Dioscorea tarokeensis Hayata sp. nov. (Fig. 25). Volubilis ; caulis com- 
planato-teres glaber. Folia opposita oblonga chartacea 6-7 cm. longa 23-3 cm. 
lata apice cuspidato-acuminata basi rotundata 5-nervia margine integra, petiols. 
13-2 cm. longis glabris. Flores ignoti. Spice fructiferse circ. 10cm. longei 
Capsule cum alis ob-reniformes 3 cm. lates 2cm. longs apice obcordate basi 
truncate: ad centrum subito acute, stipitibus 1mm. longis. Semina valde com- 
planata. 
Dioscorea glabra Hayata Gen. Ind. p. 84 (non Roxs.). 
Dioscorea oppositifolia Hayata Gen. Ind. p. 84 (non Lryy.). 
Has. Taroko, leg. G. Naxanara, Jan. 1906. 
Near Dioscorea rhipogonoides Ottv.; 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 8-15em. longa 
