42 DIOSCOREACEE. 
Dioscorea pseudojaponica Hayara sp. nov. (Fig. 21). Volubilis ; caulis 
complanato-teres glaber. Folia opposita triangulari-ovata vel -oblonga chartaceo- 
membranacea 6-10 cm. longa 53-6 cm. lata apice caudato-acuta basi lata auri- 
culata margine subintegra 7-nervia utraque glabra, petiolis 3-4 cm. longis glabris 
gracilibus. FL 2: spicati, spicis ad axillas foliorum verticillatim sitis simplici- 
bus 3 cm. longis glabris gracilibus triquetris subalatis, floribus sessilibus semi- 
clausis, bracteis triangularibus cuspidatis 1 mm. longis; perianthium globosum 
2mm. in diametro, segmentis 6 rubro-punctatis valde imbricatis, 3-exteriori- 
bus majoribus rotundato-oblongis 14 mm. longis valde concavis glabris - apice 
obtusis, interioribus minoribus ; staminibus 6 subsessilibus, antheris oblongis 
3mm. longis apice emarginatis ; rudimentum ovarii 0. Flores $: ignoti. 
Capsule cum alis late reniformes 3cm. late 18mm. long basi apiceque 
cordate. Semina valde complanata circumcirca ala membranacea cincta cum 
alis 18 mm. in diametro. 
Dioscorea japonica et rhipoyonoides Hayata Gen. Ind. p. 84. 
Has. Shichiseitonzan, Rarazan, Gukutsu, Ritézan, Maso, Kelung, Tam- 
sui, Gaogan, Taikokan, Byéritsu-Taiko. 
Very near Dioscorea japonica THUNB.; but differs from it in the much 
larger capsules and in the quite obtuse anthers which are not appendiculate 
at the apex. 
Dioscorea alata Linn. (Fig. 22). Volubilis; caulis teres glaber levis 4- 
alatus, alis undulatis 1-2 mm. latis. Folia opposita oblongo-cordata vel oblongo- 
criangularia 10-12cm. longa 5-6cem. lata apice acuminata basi cordata vel 
tordato-auriculata ad centrum acuta margine integra chartacea utraque pagine 
glabra 7-nervia, nervis supra haud subtus prominente elevatis, venulis 
tenuissimis, petiolis 5-6em. longis gracilibus glabris tenuiter 4-alatis, 
alis basi decurrentibus ad auriculas dilatis. Racemi axillares fructiferi 
15 em.—20 cm. longi glabri 4-alati. Capsule premature cum alis in ambitu 
obovoidex, alis 3 latis 5mm. latis basi attenuatis, stipitibus 2mm. longis. 
glabris. 
Haz. Banchoryé: Rond, leg. U. Morr, No. 5523, ‘Nov. 1907. 
Nearly identical with the figure given in Wicut Ic. t. 810; but somewhat 
differs from it in having ovately cordate leaves. 
