こつぶきんえのころ (小粒金狗尾)

Setaria pallide-fusca

Setaria pallide-fusca

わが国の各地をはじめ、世界の熱帯・亜熱帯地域に広く分布しています。道端や荒れ地などに生え、高さはふつう30センチほどになります。茎は直立して株立ちとなり、線状披針形の葉が互生します。葉や葉鞘は無毛です。8月から10月ごろ、茎の先に「きんえのころ(金狗尾)」よりも小さく、長さ2〜3センチほどで、紫色を帯びた褐色の花穂をつけます。 
イネ科エノコログサ属の一年草で、学名は Setaria pallide-fusca。英名は Yellow bristle grass。 
The yellow bristle grass (Setaria pallide-fusca) belongs to Poaceae (the Grass family). It is an annual herb that is widely distributed in tropical and subtropical regions of the world, including various parts of Japan. This herb grows on roadsides and wastelands, and is usually about 30 cm in height. The stems stand upright and are clumping, with linear lanceolate leaves alternating. The leaves and petioles are hairless. The flowering spikes are purple-tinted brown, smaller than "Yellow foxtail" (Setaria glauca), about 2 to 3 cm long, and borne at the tip of the stem from August to October. 
岐阜県中津川市「苗木城趾」にて、2004年10月02日撮影。 

Shu Suehiro
shu@botanic.jp