台灣新紀錄禾草－－日本莠竹

Microstegium japonicum (Miq.) Koidz. as a Newly Recorded Grass to Taiwan

This paper describes Microstegium japonicum (Miq.) Koidz. as a newly recorded species of grass to Taiwan. It was collected first by M. T. Kao in 1954, but misidentified as M. somae. M. japonicum is easily distinguishable from M. somae: the former has 1-awned spikelets and awn borne only on the fertile lemma, whereas the latter has 3-awned spikelets and awns borne on upper glume and both lemmas. 本文報導新近確認的一種台灣新紀錄禾草－－日本莠竹（Microstegium japonicum（Miq.）Koidz.）。本種最早由高木村先生於1954年採得，當時被誤認為相馬莠竹（M. somae），兩者之區別為日本莠竹之小穗只在上位外稃具一長芒，而相馬莠竹之小穗則在內穎、下位外稃及上位外稃各具一長芒。