琉球列島奄美大島の絶滅危惧植物アマミヒイラギモチ(モチノキ科)の植物体サイズと葉の二型性 Plant-size and leaf dimorphism of the vulnerable species Ilex dimorphophylla (Aquifoliaceae) on Amamioshima Island in the Ryukyu Archipelago

Access this Article

Search this Article

Author(s)

Abstract

アマミヒイラギモチ(Ilex dimorphophylla Koidz.)は奄美大島の湯湾岳山頂付近に発達した風衝林内に生育するモチノキ科の樹木である。本種における樹木サイズと葉の二型性について自生地で調査した。84 シュートの生育を確認し,そのうちの32 シュートが全縁の成熟葉を,残りの52 シュートが鋭い鋸歯のある幼葉のみをもっていた。葉の二型性は樹木高で約130―210 cm,根元直径で15―27mm を境にして分かれていることが明らかになった。

The tree Ilex dimorphophylla Koidz.(Aquifoliaceae)is a vulnerable species that is endemic to the summit of Mt. Yuwan on Amamioshima Island, Japan. This plant hows characteristic leaf dimorphism, which increases its horticultural value, and many individuals have been illegally removed from the natural habitat. We examined the umber of shoots, leaf morphology and plant size of the species in the natural habitat. Based on field observation for two years, we found 84 shoots, of which 32(38.1%)had entire mature leaves, whereas 52(61.9%)had only serrate juvenile leaves. Majority of the examined shoots surveyed fell into the smallest size classes : < 100 cm in eight(ca. 45%)and < 25 mm in diameter at the trunk base(ca. 60%). Leaf dimorphism was clearly demarcated in trees at 130―210 cm in height and 15―27 mm in diameter at the trunk base.

Journal

  • The Journal of phytogeography and taxonomy

    The Journal of phytogeography and taxonomy 56(1), 7-11, 2008-06-30

    植物地理・分類学会 = The Society for the Study of Phytogeography and Taxonomy

References:  20

Codes

  • NII Article ID (NAID)
    10023989626
  • NII NACSIS-CAT ID (NCID)
    AN00307805
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    03886212
  • NDL Article ID
    9758211
  • NDL Source Classification
    ZR3(科学技術--生物学--植物)
  • NDL Call No.
    Z18-750
  • Data Source
    CJP  NDL  IR 
Page Top