だけすげ (岳菅)

Carex paupercula

Carex paupercula

Carex paupercula

Carex paupercula

わが国の本州、中部地方以北から北海道、それに北半球北部に広く分布しています。亜高山帯から高山帯の高層湿原に生え、高さは15〜40センチになります。「やちすげ(谷地菅)」によく似ています。葉は線形で幅は3ミリほどです。6月から7月ごろ、茎頂に花穂をだします。頂小穂は雄性、側小穂は雌雄性で下垂します。「やちすげ」の側小穂は1〜2個ですが、本種では2〜4個あるのが特徴です。和名は、最初に発見された「乗鞍岳(だけ)」に因みます。 
カヤツリグサ科スゲ属の多年草で、学名は Carex paupercula。英名は Poor sedge。 
The Poor sedge (Carex paupercula) belongs to Poaceae (the Grass family). It is a perennial herb that is widely distributed widely northward from the Chubu region of Honshu to Hokkaido in Japan, and the northern part of the Northern Hemisphere. It grows in the subalpine to alpine high moors and can reach 15-40 cm in height. It is very similar to "Yachi-suge" (Carex limosa). The leaves are linear and about 3 mm wide. From June to July, flower spikes are borne on the shoot apex. The acrogyrous spikelets are male and the pleurogerous spikelets are hermaphroditic and hang down. "Yachi-suge" has 1 to 2 pleurogerous spikelets, but this species is characterized by 2 to 4 spikelets. The Japanese name comes from the first discovery of "dake" (Mt. Norikura-dake). 
長野県小谷村千国乙「栂池自然園」にて、2006年08月02日撮影。 

Shu Suehiro
shu@botanic.jp