DIOSCOBEACILffi. 39 



latum medio sursum 6-lobatum, lobis late triangularibus apice acutis patenti- 

 bus glabris ; staminibus 3, filamentis ^ mm. longis glabris, connectivis dilatatis, 

 loculis antheranim remotis ; staminodiis 3 minutis ; rudimentum ovarii minu- 

 tum coniciun apice 3-fidum. Fl. ^ : spicati, spicis solitariis 5 cm. longis 

 glabris gracillimis triquetris ; floribus sessilibus ad nodos solitariis basi bractea- 

 tis, bracteis late ovatis l^ mm. longis 1 mm. latis apice cuspidatis ; ovarium 

 inferum 5 mm. longum 1 mm. latum glabrum triquetrum ; periantliii lobis 

 rotimdatis | mm. longis et latis glabris ; staminodiis 6 minutis ; stylo colum- 

 niformi ^mm. longo apice 3-fido, segmentis recurvis. Capsulae cum alis 

 obcordatse 2 cm. longfe totiusque latse apice leviter cordatse basi obtuso- 

 i-otimdatse. Semina valde complanata rotundata circumcirca ala membranacea 

 cincta. 



Dioscwea Tokcn^o Hayata Gen. Ind. p. 84 (non Makino). 



Hab. Kelung, leg. B. Hayata (typus !) ; Busegan, Seisui, Keitao, Taroko, 

 Shinjio, Batakan, Gaogan. 



Near Dioscm^ea Tokoi'o, but differs from it in tlie much broader 

 capsules. 



Dioscorea Matsudai Hayata sp. nov. (Fig. 20). VolubiHs ; cauHs com- 

 planato-teres glaber graciHs. Folia opposita vel alterna lanceolata vel oblongo- 

 lanceolata chartacea 6-9 cm. longa 2|-3 cm. lata apice acuta vel acuminata basi 

 rotundata vel obtusa utraque glabra 5-nervia, petioHs 2 cm. longis glabris 

 graciHbus. Flores J paniculati, panicuHs axiUaribus soHtariis 5-6 cm. longis 

 ramosissimis, floribus ad nodos soHtariis basi bracteatis, bracteis ovato-triangu- 

 laribus I nun. longis cuspidatis ; perianthii segmentis 6, exterioribus 3 majori- 

 bus rotundatis 1| mm. in diametro glabris valde concavis, interioribus minori- 

 bus ; staminibus 6, fifllamentis complanatis glabris ^ mm. longis, antheris 

 oblongis I mm. longis. Capsulae cum aHs 3|-4 cm. latae 2|^ cm. longse breve 

 stipitatae. 



Hab. Monte Buisan, l^. Y. Matsuda, Juli. 1918, (typus !) ; inter 

 Karapin et Suisharyo, Kehing, Ochobi, leg. B. Hayata. 



Near D. rhipogonoides, but differs from it in having much thinner leaves ; 

 also alHed to D. (yppositifdia, but distinguishable from it in the much longer 

 male spikes. 



