Japanese name: ウマスゲ（馬菅） Scientific name:Carex idzuroei
[Overview]
A perennial 40–60 cm tall that grows in wet marshy places.
There are pale-colored sheaths at the base of the stem.
The leaves are flat and linear, pale green on the underside.
Spikelets are borne at the stem tip; the pale brown terminal spikelet is male and has a long stalk, while the lateral spikelets are set somewhat apart, oblong, and female.
The lower lateral spikelets have short stalks.
The perigynia are narrowly ovate, 10 mm long, many-veined and markedly inflated, and the top forms a long, erect beak.
The perigynia lose their gloss when dry.
[Notes]
The Japanese name comes from the plant's large habit.
