42 DIOfc'COREACEJE. 



Dioscorea psendojaponica HAYATA sp. nov. (Fig. 21). Volubilis ; caulis 

 complauato-teres glaber. Folia opposita triaugulari-ovata vel -oblonga chartaceo- 

 membranacea 6-10 cm. longa 5-| 6 cin. lata apice caudato-acuta basi lata auri- 

 culata niargine subiutegra 7-nervia utraque glabra, petiolis 3-4 era. lougis glabris 

 gracilibus. Fl. J : spicati, spicis ad axillas folioruin verticillatim sitis simplici- 

 bus 3 era. longis glabris gracilibus triquetris subalatis, floribus sessilibus semi- 

 clausis, bracteis triangularibus cuspidatis I mm. longis ; perianthiuru globosum 

 2 mm. in diametro, segineutis 6 rubro-pnuctatis valde inibricatis, 3-exteriori- 

 bus niajoribus rotundato-oblongis 1| niui. longis valde concavis glabris apice 

 obtusis, interioribus minoribus ; staminibus 6 subsessilibus, autheris oblongis 

 | niui. longis apice emarginatis ; rudimentum ovarii 0. Flores ? : iguoti. 

 Capsulse cuin alis late reniformes 3 cm. lafee 18 mm. longre basi apiceque 

 cordatje. Seniiua valde complanata circumcirca ala rnembranacea cincta cum 

 alis 18 mm. in diametro. 



Dioscorea japonica et rhipogonoides HAYATA Gen. Ind. p. 84. 

 HAB. Shicliiseitonzan, Rarazan, Gukutsu, Kitozau, Maso, Keluug, Tam- 

 sui, Gaogau, Taikokan, Byoritsu-Taiko. 



Very near Dioscorea japonica THUNB. ; but diilers from it in the much 

 larger capsules and in the quite obtuse anthers which are not appendiculate 

 at the apex. 



Dioscorea alata LIXN. (Fig. 22). Volubilis ; caulis teres glaber Isevis 4- 

 alatus, alis undulatis 1-2 mm. latis. Folia opposita oblougo-cordata vel oblougo- 

 criangularia 10-12 cm. louga 5-6 cm. lata apice acuminata basi cordata vel 

 tordato-auriculata ad centrum acuta niargine integra chartacea utraque pagine 

 glabra 7-nervia, nervis supra hand subtus prominente elevatis, venulis 

 teuuissimis, petiolis 5-6 cm. lougis gracilibus glabris tenuiter 4-alatis, 

 ahs basi decurrentibus ad auriculas dilatis. Racemi axillares fructiferi 

 15cm.-20cm. longi glabri 4-alati. Capsulee j>rematurse cum ah's in ambitu 

 obovoidese, alis 3 latis 5 mm. latis basi attenuatis, stipitibus 2 mm. longis 

 glabris. 



HAB. Banchoryo : Rono, leg. U. MOEI, No. 5523, Nov. 1907. 

 Nearly identical with the figure given in WIGHT Ic. t. 810 ; but somewhat 

 differs from it in having ovately cordate leaves. 





