うらじろがし (裏白樫) [Index] [Back]

Quercus salicina

Quercus salicina

Quercus salicina

Quercus salicina

わが国の本州、宮城・新潟県以西から四国・九州、それに済州島や台湾に分布しています。山地に生え、高さは20メートルほどになります。樹皮は灰黒色で平滑、円形の皮目が散生します。葉は長楕円状披針形で薄い革質、先端は鋭く尖り、上部の3分の2以上には浅い鋸歯があります。表面には光沢があり、裏面は粉白色になります。雌雄同株です。5月ごろ、新枝の下部から雄花序を垂らし、新枝の上部の葉腋に雌花序を直立させます。果実は広卵形の堅果で、翌年の秋に成熟します。材は建築材や器具材として利用されます。 
ブナ科コナラ属の常緑高木で、学名は Quercus salicina。英名はありません。 
"Urajiro-gashi" (Quercus salicina) belongs to the Fagaceae (the Beech family). It is a tall evergreen tree that is from Miyagi-Niigata Prefecture of Honshu west to Shikoku and Kyushu, as well as the Jeju-do (southern Korea) and Taiwan. This tree grows in mountains and up to a height of about 20 m. The bark is gray-black, smooth and the rounded lenticels are diffused. The leaves are elliptic-lanceolate and thin leather with acute tips, and shallow saw teeth in over two thirds of the top. The surface is glossy and the reverse side is powdery white. It is monoecious. The male inflorescences are hung from the lower part of the new branch, and the female inflorescences are erected on the axil of the upper part of the new branch, around May. The fruits are broad ovate nuts and will mature in the fall of the following year. The timbers are used as building materials and equipment materials. 
愛媛県西条市飯岡にて、2017年10月01日撮影。 

Shu Suehiro
shu@botanic.jp