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A New Species of Tetrastigma (Vitaceae) from the Ryukyus PDF

3 Pages·1994·0.24 MB·English
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Preview A New Species of Tetrastigma (Vitaceae) from the Ryukyus

植物研究雑誌 J. Jpn. Bot. 69: 176-178 (1994) AN ew Species of Tetrastigma (Vitaceae) from the Ryukyus Takasi YA MAZAKI Botanical Gardens,Fa culty of Science,Un iversity of Tokyo, 3-7-1 Hakusan,Bu nkyo-ku. Tokyo,1 12 JAPAN (Received on December 1,1 993) A new species Tetrastigma,T. liukiuense Yamaz.,is described from the Ryukyus. A Ryukyu plant belonging to Te trastigma has Hatusima,F l. Ryukyus: 395 (1971). hitherto been treated as T. formosαnum (Hemsl.) Tetrastigma dentatum auct. non Hayata: Gagnepain (Fig. lc). However,it is distinctly differ- Momiyama in Satake et al. ed.,W ild Flow. Jap., ent from T.formsanum ofTaiwan by the petal with a Woody Pl. 2: 62 (1989). hooked appendage at apex (Fig. la). Recently, Lianae sempervirentia. Caulis gracilis,te tragonus, Momiyama (1989) adopted T. dentatum (Hayata) Li glaber. Cirrhi simplices,3- 7 cml ong .iFolia altema, of Taiwan (Fig. 1b) to this plant. But this plant also temata; stipuli 2,o vati,s ubacuti,ca . 3m ml ongi, differs from T. dentatum in the glabrous inflores- glabri; petiolus 2--4 cml ongus,gl aber; petioluli 2-10 cences,th e shortly acute leaves and the stigma-lobes mmlo ngi,gl abri; foliolum terminale oblongo-ovatum shorter than the styleaxis.Accordingly,t his plant vel oblongum,3- 7 cml ongum,1- 2.5 cml atum,ap ice 】 should be treated as an independent species. acutum vel breviter acuminatum,b asi cuneatum, Tetrastigma Iiukiuense Yamazaki,sp . nov. foliola latealia leviter minora,o vata vel oblongo- Tetrastigma formosa mauct. non. Hemsley: ovata,ap ice acuta,ba si inaequaliter rotundata,fo liola 仰 Nakai in Bot. Mag. Tokyo 36: 68 (1922),p . p.; omnalia sparse serrata,田町isappressis,a piculatis, Fig. 1. Flowers. a. Tetrastigma liukiuense Yamaz. b. T. dentαtum (Hayata) Li. c. T.formosanum (Hemsl.) Gagnep. 一一176一一 June 1994 Joumal of Japanese Botany Vo .l69 No. 3 177 utrinque glabra. Inflorescentiae oppositifoliae, comiculata. Stamina4,pe talis leviter breviora. Stylus corymboso-cymosae,2 -4 cm longae,2 -3 cm latae, filiformis ca. 1m ml ongus; stigma 4-1obata,q uam pedunculis glabris,p edicelibus 1.5-3 mml ongis, stipes breviora. Fructus non vidi. glabris. Calyx acetabuliformis,ca. 1m mla tus,gl aber. Hab. Okinawa Isl.: Kunigami,Ma giri (Y. Tashiro, Petala 4,ov ata,ac uta,ca . 1.5 mmlo nga,ap ice reflexo- Feb. 1887,TI ),N ago,in mountaIn (T. Tanaka,M ay Fig.2. Tetrastigma liukiuense Yamaz. Type. 178 植物研究雑誌第69巻第3号 平成6年6月 30,1 891,n o. 164,T I),S ine dato (T. Miyagi,T I), flowers whitish green (T. Yamazaki,Ju n. 24,1 971, Motobu,N ago-Fuuma (Kimura et Hurusawa,S ept. no. 309,Ty pus,TI ). 20,19 40,TI ),Ka tsuudake,40 0 m,in evergreen forest, 山崎 敬:琉球からのミツバカズラ属(ブドウ科) の1新種 琉球のミツバカズラ属の植物は中井先生 に,葉の先が鋭頭かみじかく鋭尖頭になって, ミ (1922)が同定して以来,永らく台湾のミツバビ ツバカズラのように長く鋭尖頭にはならない点が ンボウカズラ Tetrastigmaformosanum (Hemsl.) 異なる.また l例しか見ていないので確実ではな Gagnepainと同じものとされていたが,花弁に鈎 いが,花柱の4裂する柱頭は柄より短くて, ミツ 状突起のある点で,全く別の種類であることに以 バカズラがほぼ同長なのと異なる. ミツバカズラ 前から気がついていた. 最近, 籾山泰一氏 に最も近いが,琉球固有の種類として区別するの (1989)はこれを台湾の T.dentatum (Hayata) Li がょいと思う.和名には籾山氏が T.dentatumと ミツバカズラに変更されたが,花序が無毛の点が して琉球のものに付けたオモロカズラを使えばよ 異なるとしている. ミツバカズラからは花序以外 いであろう.

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