8 D. Prain & I. H. Burkill — On Dioscorea deltoidea, etc. [Supplt. 



" Nanshan, Bosthorn, 2128 " : and he further describes a variety, naming it var. 

 Rosthornii, also from Nanshan, in the following words : — *' foliis amplis acutissime 

 acuminatis subtus ad nervos albo-setulosis ideoque cinerascentibas." 



Dioscorea septemloba, Thunb. Radix ignota. Gaules glabri, sinistror- 

 sum volubiles, teretes, inermes, virides. Folia alterna, tenuiter char- 

 tacea, supra glaberrima, subtus ad neryulos minute papillosa, opaca nee 

 pellucide lineolata, ex siccitate brunnea, cordata, acuminata, apice 

 minutissime mucronulata, basis sinu lato, margine septemloba lobis 

 basalibus obtusis sed caeteris subacutis vel acutis, 7-nervia, nervia 

 extimis profunde bifidis, nervulis secondariis refciculatis subtus dis- 

 tinctis sursum obscuris, 10 cm. longa, 12 cm. lata, Spicse masculss 

 ignotae. Spicse feminese axillares, solitariae, simplices, 8-10 cm. longae, 

 dependentes ; floras 10-12, sessiles, circiter 1 cm. remoti : bractess 

 fructu maturo late ovataa : bracteolse ovatee, acuminatae. Capsulde ses- 

 siles, assurgentes, colore cupreae : ala9 mature pergamentaceaB, basin 

 versus attenuatae, apice rotundato-truncatae, 2 cm. longae, 1*2 cm. latae, 

 castaneas. Semina in quoque loculo gemina, obovata, complanata, ala 

 membranacea alba inaequaliter circumcincta. Dioscorea septemloha, 

 Thunb., Fl. Jap., (1784), 149. D. qainqueloba, Franchet et Savatier, 

 Enum. Flor. Jap., II., (1879), 46. 



Central Japan. Island of Nippon : Joshu (Hitachi) ; Yubiso, 



Makino. 



Makino gives the Japanese name as Momiji-dokoro on the label of a herbarium 

 specimen kindly sent to us from the Hongkong Herbarium by Mr. S. T. Dunn. 



Dioscorea nipponica, Makino. Radix igtiota. Caules glabri, sinfs- 

 trorsum volubiles, teretes, inermes, virides. Folia alterna, chartacea, 

 supra glaberrima, subtus ad nervos et nervulos pilis albis simplicibus 

 hirtella, opaca nee pellucide lineolata, subdeltoideo-cordato-ovata, 

 acuminata, apice minutissime mucronulata, basis sinu lato, margine un- 

 dulatavel parum 5-7-lobata, lobis rarissime subacutis, 7-9-nervia, nervis 

 extimis bifidis, nervulis secondariis supra obscuris subtus subdistinctis, 

 7-10 cm. longa, 6-10 cm. lata : petiolus apicem versus hirtellus, casterura 

 glaber, gracilis, supra canaliculatus, 4-8 cm. longus. Spicse masculss 

 ignotae. Spicse feminese axillares, simplices, singulae, 15-25 cm. longae, 

 dependentes : flores 25-30, sessiles, deorsum spectantes, 5-8 mm. remoti : 

 bracteae lineari-lanceolatae, acutissimae : bracteolae similes, minores. 

 Gapsulse sessiles, assurgentes, stramineae, purpureo-punctatae : alae mature 

 seraiovatae, apice retusae, basin versus attenuatae vel rotundatae, stra- 

 mineae, 2 cm. longae, '6-7 cm. latae. Semifia in quoque loculo gemina.. 

 ovata, complanata, ala membranacea alba inaequaliter circumcincta. 



