Morphological Differences between Two Types of Imperata cylindrica. (L.) BEAUV. Characterized by Flowering Phenology

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  • 開花時期の異なるチガヤ(Imperata cylindrica (L.) BEAUV.)2タイプ間の形態的差異
  • カイカ ジキ ノ コトナル チガヤ Imperata cylindrica L Beauv 2 タイプ カン ノ ケイタイテキ サイ

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Abstract

Imperata cylindrica distributed in Japan had been classified into two varieties, var.koenlgii (named Fushigechigaya) and var.genuina (named Kenashichigaya or Kawarachigaya), based on the presence or absence of hairs on node of flowering culm. But now, it is thought that there are no varieties of Imperata cylindrica in Japan, because hairs are not considered to be important character on taxonomy. Recently, we found two types of Imperata cylindrica characterized by flowering phenology. We tried to clarify whether there are morphological differences or not. There are no hairs on node of flowering culm in 31 clonal fragments of early flowering type (E-type). But, there are long white hairs on node of flowering culm in 35 clonal fragments of the late flowering type (C-type). E-type had white powder on leaf sheath, but C-type had no powder. Frequency distributions on length of prickles around leaf margin were different between two types. E-type had short prickles ranged from 0μm to 80μm and C-type had long prickles ranged from 240μm to 400μm. Sizes of prickles were quite different between two types even if considering clonal variation. It can be said there are two taxonomically groups differing in not only flowering phenology but also morphological differences. It is considered that E-type is corresponding to Kenashichigaya and C-type is corresponding to Fushigechigaya.

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