Carex omiana var. omiana ("Yachikawazusuge")

Japanese name: ヤチカワズスゲ （谷地蛙菅）
Scientific name: Carex omiana var. omiana

[Overview]
A perennial 30–50 cm tall, growing in wetlands and moors.
The rhizome is short and no stolons are produced.
The leaves are linear, 0.2 cm wide, and grow in tufts.
The inflorescence at the stem tip consists of 3–5 spikelets; most of each spikelet is female flowers, with a few male flowers at the base.
The terminal spikelet has more male flowers.
The spikelets are obovate, 0.7–1.2 cm long, chestnut brown or slightly greenish, and glossy.
The perigynia are plano-convex, 0.4–0.5 cm long, smooth and glossy, spongy at the base, and gradually taper into a long beak at the top.
The perigynia are green at first, then turn chestnut brown when ripe, and the beak curves back.

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