10 D. Pr^in & I. H. Burkill — On Divscorea deltoidea, etc. [Supplt. 



vel subdeltoideo-cordafca-ovato-acuminato, apice mucrontilata, basis sinu 

 lato, aliquomodo ad medium, constricta, 7-9-nervia, nervis extimis 

 puofaiide bifidis, nervulis secondariis refciculatis ntrinque distinctis, ad 

 9-10 cm. louga, 6-10 cm. lata : pefciolus glaber, supra parum canali- 

 culafcu8, 6 cm. longus. Racemi masculi simplices, solitarii vel 2-4-iii, 

 10 cm. longi ; flores longius pedicellati, glomerati, 2-5-iii (glomerulis 

 •75 cm. remotis) sparsim dispositi : pedicelli 3-5 mm. longi (teste 

 Franchetio Savatieroque 5-8 mm. longi). Pedunculus glaber, ad 3 cm. 

 longus ; bracteee ovato-lanceolatge, ad 2 mm. longse ; bracteolae suborbi- 

 culatse, glabrae, pedicellis multo breviores. Periaiitliii masculi laciniae 

 lanceolatae, obtusiusculiu, refractae, subsequales. Stamina 6, seqnalia, 

 periantliio distincte breviora : antheraB didymas. Spicae femineiB axil- 

 lares, simplices, solitariae, nsque ad 12-15 cm. longae, dependen- 

 tes ; flores ad 25, solitarii vel cymulosim bini (alter major alter 

 minor) in ramulis perbrevibus 5-7 mm. distantibus dispositi, 

 deorsum spectantes : rhachis distincte trigona, aliquomodo zigzag. 

 Perianthii masculi laciniae iis floris masculi similes : bracteae et bracteolaa 

 adsunt. Gapsulse assurgentes, latiores quam longae, basi et apice eniar- 

 ginatag (teste Francbetio Savatieroque). Semina (teste Maximowicz) 

 circumcirca alata. — Dioscorea tenuipes, Francbet et Savatier, Enum. 

 Flor. Jap., II., 525. Dioscorea sativa, Miq., Prolusio Flor. Jap., (1867), 

 323, quoad plantara masculam. 



Southern Japan. Island of Kiusiu r Nagasaki, Ifa^iwomcz. Is- 

 land of Shikoku : Tosa ; Nanokawa, MaJcino. 



Dioscorea Yokusai. Radix if^nota. Caules glabri, sinistrorsuni 

 volubiles, minopere angulati, inermes, virides. Folia alterna, membra- 

 nacea, glaberrima, nitentia, cordato-acuta vel breviter acuminata, apice 

 m.ucronulata, sinu basis latissimo, margine integra vel plus minus undu- 

 lata, nonnunquam ad medium constricta, 7-nervia, nervis extimis pro- 

 funde bifidis, nervulis secondariis reticulatis subtus distinctis, 5 cm. 

 louga, 5 cm. lata : petiolus glaber, gracilis, supra profunde canaliculatus, 

 35 cm. longus. Injlorescentia mascnla per rbacbin angulatam ad 7 cm. 

 longam cymulas 3-5-flora8 5-10 mm. remotas gerens : flores distincte 

 pedicellati, pedicellis 2-3 mm. lon^is : pedunculus glaber, angulatus, 2-3 

 .cm. longus : bracteae ovato-lanceolatEe, acutas vel acuminatae, ad 2 mm. 

 longae: bracfceolae ovatae, acutas, pedicellis multo breviores. Perianthii 

 masculi laciniae biseriatae, exteriores ovato-lanceolatae subacutae, inter- 

 iores obovatae obtusaa vel truncatae, patentes. Stamina 6, aequalia, 

 periantbio distincte breviora: antberae didymae. Spicss feminese axil- 

 lares, simplices, solitaria?, usque lad 8 cm. longae, dependcntes ; flores 



