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Page 1 植物研究雜誌 J. Jpn. Bot. 81: 75-90 (2006) Additions And 植物研究雑誌 J. J. Jpn. Bo t. 81: 81: 75-90 (2006) Additions Additions and Corrections in Salicaceae of Japan 2 Hiroyoshi Hiroyoshi OHASHI and Koji YONEKURA Botanical Botanical Garden ，Tohoku University ，Sendai ， 980-0862 JAPAN E-mail: E-mail: ohashi@mai l.t ains.tohoku.ac.jp (Received on October 24 ， 2005) The circumscriptions of Sa !i x shiraii Seemen and S. rup( 介。 ga Koidz. are clarified by the sep 紅 ation of S. shiraii v紅 . kenoensis (Koidz.) Sugim. ，a plant of the Kanto Mountains Mountains and northeastern side of Mts. Yatsugatake. Sa !i x shiraii var. kenoensis was usually usually included in S. shiraii but sometimes misidentified as S. rup{ 斤'aga. Salix sieboldiana sieboldiana Blume has been generally recognized as a single polymo 中hic species ， but V 訂 . doi αna (Koidz.) H. Ohashi & Yonek. from southem Kyushu (Miyazaki and Kagoshima Prefectures) is recognized within the species. Three new nothosubspecies are recognized recognized among the hybrids of S. vulpina Andersson: S αlix xampherist αC.， K. Schneid. nothosubsp. nothosubsp. yamatoensis (Koidz.) H. Ohashi & Yonek. ， S. xhiraoana Ki mura nothosubsp. nothosubsp. tsugaluensis (Koidz.) H. Ohashi & Yone k. and S. xsendaica Ki mura nothosubsp. nothosubsp. ultima (Koidz.) H. Ohashi & Yonek. (Continued (Continued from 1. Jpn. Bo t. 81: 35 -4 0， 2006) Key words: Hybrids ，Japan ，nothosubspecies ，Salicaceae ，Salix. The Salicaceae of Japan is compiled by from M t. Komagatake in the Ak aishi Ohashi (200 1). This paper as well as a previ- Mountains in Yamanashi Prefecture. Both ous ous one (Ohashi and Y onekura 2006) intend species grow in rocky places of high to to revise the systematic works of J apanese montane to subalpine regions in northern and Salicaceae Salicaceae based on herbarium specimens central Honshu (Ohashi 200 1). Most plants kept kept mainly in TUS and TUS- K ，and our hitherto referred to S. shiraii from the Kanto field field studies in various places in J apan. In Mountains are different from the typical this this study herbarium specimens of KYO and form in having n訂 row leaves with persistent TI are also examined. hairs on the lower surface and shorter bracts. They approach S. rupifraga in these charac- 4.8α lix shiraii Seemen and S. rupifraga ters ，but ，when comparing female plants in Koidz. the same population ， they are easily distin- Salix Salix shiraii Seemen is usually distin 聞 guishable from S. rup{ 介。 gαby the long stipe guished guished from S. rup 析。 ga Koidz. by the fea- of the ovary. Sa !i x shiraii has the ovary stipe tures tures of leaf blades ， bracts and longer ovary longer than the nectary against shorter or as stipe stipe (Figs. 1， 2). They are ，however ， often long as ， the nect 訂 y in S. rupij シ'aga. Also ， hardly hardly distinguishable from each other plants from northeastem side of Mts. mainly in the Kanto Mountains and Nagano Yatsugatake in N agano Prefecture and from Prefecture. Prefecture. M t. Akagi-san in Gunma Prefecture show Salix Salix shiraii was described from Nikko in the similar features to the Kanto Mountain Tochigi Tochigi Prefecture and S. rup{ 斤αga Koidz. variant of S. shiraii. The typical form of S. -75- 76 76 植物研究雑誌第81 巻第2号 平成18 年4 月 from from the Kanto Mountain variant mentioned above. above. Ohashi (2000 ， 2001) treated S. kenoensis kenoensis as a synonym of S. shiraii. Here we follow Sugimoto's treatment (1 96 1) and adopt adopt the name S. shiraii var. kenoensis (Koidz.) (Koidz.) Sugim. for the Kanto Mountains vanan t. Salix Salix rupifraga is restricted to the northem Akaishi Akaishi Mountains and disjunctively to a few localities in the Hida Mountains. The typical typical S. shiraii (= S. shiraii va r. shiraii) shiraii) is distributed in the southem p訂 t of the the Owu Mountain Range (northward to Yamadera in Yamagata Prefecture ，south- ward to Mts. Nasu-dake in Tochigi Prefecture) ， the Nikko Mountains in Tochigi Prefecture Prefecture and northemmost Kanto Mountains Mountains in Gunma and N agano Prefec- tures. tures. Most records of S. rupifraga and S. shiraii shiraii from Kanto Mountains ， Mts. Akagi- san san and Haruna-san and the northeastern side of of Mts. Yatsugatake should be referred to S. Fig. Fig. 1. Salix shiraii Seeman (Nikko. Ki mura 535 ， shiraii va r. kenoensis (Fig. 4). TUS-K 9793) showing leaf-shape and long The taxonomic position of Salix shiraii ov 訂 y-s tI pe. V 紅 . kenoensis is controversia l. Kitamura and Murata Murata (1 979) classified S. kenoensis into the the section Helix of subgen. Salix ， because shiraii shiraii is confined to M t. Asama-yama and the male f1 0wers of the species from M t. t. M t. Kabutoiwa-yama in Saku-shi and Mts. Buko-san frequently have filaments connate Myogi 田 san in the northem Kanto Mountains. at the base. In contrast ， Ohashi (2000 ， 2001) We have not find typical S. rupifraga from grouped Salix shiraii including S. kenoensis the the Kanto Mountains. and S. rupf 斤αga ， in section Hastatae of Koidzumi (1913) described Salix subgen. Vetrix ， which is characterized by the kenoensis kenoensis Koidz. based on a female speci- male f1 0wers with two free stamens. Connate men collected on M t. Buko-san in the Kanto stamens of S. kenoensis in M t. Buko-san are ， Mountains Mountains of Saitama Prefecture ， and a male however ，variable even within one catkin. specimen specimen from M t. Akagi-san. The former Specimens from the mountain ， e. g. ， was selected by Kimura (1962) as 1ectotype Hasegawa a & c，1 May 1980 (TUS) ， have of of the species (Fig. 3). Sugimoto (1 961) ne 訂 ly free stamens (Fig. 5). Moreover ， S. reduced reduced this species to a variety of S. shiraii japonica ，a member of sec t. Hastatae ， has based based on differences of leaf shape and de- stamens connate at the very base (Kitamura gree gree of pubescence. Kitamura and Murata and Murata 1979). Salix shiraii vぽ. (1 979) regarded S. kenoensis as a distinct kenoensis should be classified in sec t. species species endemic to M t. Buko-san. The Hastatae. female female f1 0wers and vegetative part of S. kenoensis kenoensis are ，however ，indistinguishable Apri12006 Apri12006 Journal of Japanese Botany Vo l. 81 No. 2 77 Fig.2. Fig.2. Salix rupifraga Koidz. (Komaki-mura. Huno s. n. ，TUS-K 8823). 78 植物研究雑誌第81 巻第2号 平成18 年4月 ぷ本珂 J 'j 6わ Fig. Fig. 3. Sa !i x kenoensis Koidz. (M t. Buko. S. Matsuda 104 ，TI ，lectotype). Apr i1 2006 Journal of Japanese Botany Vo 1. 81 No. 2 79 glaucous glaucous when young ， but often slightly so so in mature; bracts elliptic to broadly elliptic ， 0.6-2.0 mm long; ovary stipe 0.5 -0 .8 mm long ， usually 0.8-2.0(-2.3) mm long in fruit ， longer than bract ...・ H ・ ...・ H ・. S. shiraii 38 ・N B. B. Blade of mature leaves elliptic or elliptic-obovate ， base rounded to cordate ， lower surface glabrous . …… va r. shiraii B. B. Blade of mature leaves elliptic ，ob- long long or oblong-obovate ， base mostly truncate truncate or shortly attenuate but often cordate cordate in a few lower leaves ， lower 一一 -36"N surface with persistent silky hairs at least least along costa ...・ H ・.. var. kenoensis Salix Salix shiraii Seemen in Bo t. Jahrb. Sys t. 30: 30: Beib l. 67: 40 (1901); H. Ohashi in J. Jpn. 08Okm Bo t. 75: 18 (2000) & in Sci. Rep. Tohoku む Univ. Univ. ser. 4，Bio l. 40: 325 (200 1). Type: JAPAN: Honshu ， Tochigi Pre f.， Nikko ， auf 13S"E 13S"E 140"E Felsen Felsen in 2000 m Honne (M. Shirai 42 ，43 ， May 1898 ，B-syntype ，isosyntype in TI; U. Fig. Fig. 4. Distribution of Salix shiraii va r. shiraii (cir- Faurie Faurie 2142 ， 27 May 1898 ， B-syntype ， cle) ， S. shiraii va r. kenoensis (triangle) and S. rupifraga rupifraga (diamond) in Honshu ， Japan. isosyntype in KYO). V 征. shiraii Japanese Japanese name: Shirai-yanagi. Distribution: Distribution: Japan. NE and Central A key to the species and variety discussed Honshu (Yamagata ， Miyagi ， Fukushima ， above above is given below: Tochigi and Gunma Prefectures ， also on Mts. Asama-yama and M t. Kabutoiwa-yama in A. A. Leaf blade ovate-oblong; base cuneate to Nagano Prefecture). Rocky cliffs or ledges rounded ， lower surface appressed- on upper montane to subalpine regions. Al t. pubescent pubescent at least along costa ， with 600-1000 m in Tohoku Dis t. and al t. 1000- raised raised veinlets when mature ， pale green 1700 m in Kanto Dis t. and N agano Prefec- or or slightly glaucous when young; bracts ture. widely widely oblong ， 0.6-0.8 mm long; ovary Specimens examined: JAPAN. HONSHU. stipe stipe usually less than 0.6 mm long ，less Yamagata Pref. monte Ryuzan (Yuki 4019 ， 12 June than than 0.8 mm long in fruit ，nearly as long 1938 ，TUS-K). Miyagi Pref. Nojiri (Murai 10 1. 27 Ju l. 1932 ，TUS-K); Syoto-toge (Ohashi s. n. ，24 Jun. 1960 ， as as bract ....・ H ・....・ H ・....・ H ・H ・H ・.. S. rupifraga A. A. Leaf blade ovate to elliptic-ovate ， base TUS); Shibata-gun ，Kawasaki-machi ，intter Aone et Gaga (Kimura 3079 ，3 Ju l. 1950 ，TUS-K); Gaga cordate cordate to cuneate ，shortly attenuate or (Ki mura 2388-2392 ，9 Jun. 1935 ，TUS-K); ibid. ， ca. rounded rounded or all cordate ， lower surface 1200 m (Sakai 840020-840024 ，840026 ， 12 May 1984 ， glabrescent glabrescent or pubescent ， usually with TUS); Katta-gun ，Zao-machi ， M t. Zao ， near Fudo-no- inconspicuous inconspicuous veinlets when mature ， t紘 i ，ca.
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