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TThhee JJaapapnaesneSeosciee tySociety ffoorr PPllanatnt SSyystsetmaetmicastics ISSN1346-7565 ActaPhytotax.Geobot.59(1)5/1-53(2008) A New Species Dioscorea(Dioscoreaceae)from Japan of JUN YAMASHITAiand MINORUN. TAMURA2 iResea"ch lhstituteforBioresouTiO:keasy,ainaUitiversi2o--2l0-1Chuo,Kiitushiki-shi, Okayama 71O-O04a Jopan r2Botanicat Gardens G,naduat Sechoo lqfScience, OsakaCitvL.biiversi2i0j0i01(isaichKid,tano-,ghOis,aka576-OO04,JZrpan Dioscorea tabatae Hatus., nom. nud., (Dioscoreace fareo)m Amami-Oshima, is validated with a Latin diagriosis. Key words: Arnami-Oshima ,Dioscoreacea eD,ioscoreaj'aponi Deiao,score apseudojaponic aD,iosconya tahatae, Japan ,Kageshima, YUwan-dakc Dioscoi?a tabatae Hatus. (Dioscorea wcaseae) Although both specimens lack reproductive reported as a new species frem the highe relevations organs, we consider them to represent an unde- of Amami-Oshima without descripti oannd cita- scribed species, based on the unique characteristic of tion ofspecimens (Hatusi 1m9a86) .Although the dirnorph ilceaye s.We therefbre validate Dioscorea species has not been formall pyublisheq it is treat- tabatae with a Latin diagnos iasnd designatio nof a ed as an endangered species in Japan (Ervironmenttype specimen in this paper. Agency ofJapan 2000, Anonymous 2003). Dioscorea tabatae is similar to D. J'aponica While examining specimens ofDioscorea L. Thunb., but D. J'qponic ahas monomorphic leaves preserve din KAG, we fbund two specimens iden- (narrow llayn)ceola ttee triangular-ovat eco,rdate tifie das D. tabatae by Hatusima ,Mitsutak e7kebata or broadl ycordate at the base ,and 7- or 9-veined. s.n. (2 7July 1986) (Fi g1). andM 7labat as.n. (3e Dioscorea tabatae is also similar to D. pseudo- October 1977) (Fig 2,). Both specimens were col- japoni cHaayata from [Ibiwa nb,ut the leave sofD. lected from near the top of Mt. Yuwan-dake, pseudojmponica are lanceola tteo triangrilar-ovate, Amami-Oshima. The former <Fi g1.) clearly shows Compared to D, tabatae the leave sof D, pseudb- dimorphis mofthe leave sT,he smaller leave sare tri- J'aponica are much narrower. angular-avate, truncate or rounded at the base ,and Dioscorea pseudql'qponi chaas been reperted 7-veined t;he large rleave sare broadl yovate with from the Ryukyus (Hatusi m&a Amano 1958, rounded basa llobes protrudin dgownward broadly Hatusima 1961), but the leaves ofthese plant sare cordate at the base ,truncat enear the petiole ,and 9- more or les scordate at the base regardless of size. 13-veine dM, 7laba tsa.n. (3 0October 1977) (Fig,The leave sof D. pseudctfaponica are truncate or 2) has only larg eleayes b,ut they aTe broadly ovate rounded at the base, especially when srnall. We and idemica tlo the larg eleewe sofM lhbata s.n. (27 therefore regard the plant sfrom the Ryukyus to be July 1986), D. J'aponic wai,th D pseudojaponic baeing restrict- NII-Electronic Library Service TThhee　 JJaapapnaesneese　 SSooocleityety 　ffoorr　 PPllanatnt　 SSyystsetmaetmloastics 52 Acta　Phytotax　Geobot 丶bl　59 韈）ミ　」　邸ゴ尸　口　轟ト　乞　一　 ≧ 　錫　一“ 　 7目　邸門　口頚　 kO 　　一の　ゴ邸　＝　鑼丶Φ曽〔O 器ぐ弋丶唱詔［．唱瓠、OO卜卜2 ’ O隔ぢ q OO 隔00］的量霞偽帽h 幅慧鑞自聞 “慧ミ N）H．韈叫麟　 N鳶　鼕鵝　羹ド靉戮崎）鹵ミ弓　　　醐終倖鴫　副Σ呼舞邸ヨ門　警口　戸劉ゴ門7［一　　駐 ≧ 　昭　 ε 　駕ヨ　擁 o邸o 　舞　》　罵灘 Φ卩っ　　懺 ε ・邸　韈・＝　嚢慕灘ミ嚇　慰炉い覊高、転竜　（遣 O 勉kO ＜恥O隔）鬥［帆 q 腫 Qo 脳ひ円 OO 一難替h口灘一〇卜q］〇爨＝一ミリ」＝一 NNI工I工-EElleoetcrotnlroonic　 LLlibrbarryary 　Service TThhee JJaapapnaesneSeosciee tySociety ffoorr PPllanatnt SSyystsetmaetmicastics March2008 YApaIASHITA & TAMURA: A New Species ofDioscorea 53 ed to Taiwan (Yamash i&t [alamura 2008), jZzg)ane nsamee. YUwan-onidokoro (Hatusima Besides Amami-Oshima, Dioscoiea tabatae 1986). also has been reported from Tokunoshima Distributio nJ,apan: Kagoshima Pref, Arnami- (Anonymou 2s003), Although we examined addi- Oshima, highe releyations ofMt, YUwan-dake. tiona lspecimens at KUIdi, KYO and TI, in addition Additionalspeeim eexnamined, JAPAN, Kagoshima to KAG, we did not encounter spechnens from Pref: Amami-Oshima, at ninth station of Mt. Miwan- Tokunoshima that can be assigned to D, tabatae dake ,30 Oct, 1977, M. 1lrbat sa,n. (KAG). and therefb rcoensider it to be restricted to Amami- Oshima. We express our sincere gratitud teo the director asnd staff members ofthe herbari KaAG, KURA, KYO and TI, Dioscorea tabatae Hatus .ex Yamashit a& M. N, who permitted us to examine specimens, Our thanks Tamura, sp. noy, (Fig s1, .2) atrhee dmaunues ctroi pDt,r. Hi dTethoiss hsit uNdyaga wmaassu su pfpborr tcerditi eianl lpy arreat dbinyg a Dioscorea tabatae Hatus. ,Fl .Kagoshima PreE, rev ed.: Grant-in-Ai dfbr Scientif iRcesearch (1364069 9to M. 224 (1986 n)om,, nud.; M. Hotta in Bul1 .Kagoshlrna N. [famura )from the Ministry ofEducation, Scienc eand Pref. College 55: 19, 92 (2004 n)om,, nud. Culture J,apan. AMnis DioscoreaeJ'aponicae atque D, pseudojaponicae, References sed a prier fiolii sminoribus a bas itnmcatis vel rotundatis, foli imasjoribus lat eovatis, nervis fbliorum majorum pluribus 9L13, a posterio rfiolii msajoribus lat eoi･atis, Anenymous. 2003, Kagoshima Red Data Book, Plants. multo latiorib udsiversa. The fbundation of Kagoshima Envirenmental IJtp uJsA.IIAN, Kagoshima Pref: Amami-Oshima, Research and Service, Kagoshima (i Jnapanese). at the summit ofMt. ifuwan-dake, 27 Jul .1986, Mitsutake Environment Agency of Japan (ed, )20.00. Threatened 7lrbata s,n. (hol oKA-G). Wildlif eof Japan, Red Data Book 2nd ed., 8. V2tsculaPrlants,JapanWildlifeResearchCenter, Scandent herbs ,Stem twining to right, glabrous. Tok>ro (i nJapanese), Leaves opposite, simple, glabrous ;petiol e2-6.5 Hatusima, S, 1961. 0n a few Dioscorea from thc cm long; leafblade 4u 1 1 cm long ,2-9.5 cm broad Ryukyus. J .Jap .Bot. 36: 268-270 (i Jnapanese), adaxially dark green, margin entire, veins palmate, Hatusima, S. 1986. Flora of Kagoshima Pret, rev. ed. veinlets reticulate, smaller leaf blade striangular- KBaogtoasnhiicmaalCl uSbh)o.kKuabguotsshui Dmoauk(oiuknJaaipa n(eKsea)g,oshima ovate, base truncate or rounded apex attenuate, Hatusima, S. & T. Amano. 1958, Flora of Okinawa. veins 7, large rleaf blade sbroadl yovate, basally Extension Service U,nivcrsi toyfthe Ryukyus, Naha lobeq lobes rounded and protrudin gdownward (inJapanese). base broadl ycoTdate, truncate near petiole ,apex Yamashita, J, & M. N. [Ilamura ,2008. Dioscoreaceae, in: caudate, veins 9- 13. Roprodiict iojvgeuns unlcnown. Iofw aJtaspuakn i4K,a.,, KDo. dEa, nBsohuat,T 'bfrod k&y o H(.i O nphrbaes s()e,ds .Fl)o,ra Received Augttst 1 7 ,2007; acceptedDeeember 28, 2007, NII-Electronic Library Service