Cyperus rotundus var. rotundus (coco-grass, "Hamasuge")

Japanese name: ハマスゲ （浜菅）
Scientific name: Cyperus rotundus var. rotundus

[Overview]
A perennial 20–40 cm tall, found mainly on seashores.
It extends underground stems and forms tubers.
The stem is slender, and its base swells into a corm-like shape covered with brown fibers.
The leaves are linear, 0.2–0.6 cm wide, and glossy.
Spikelets are borne on branches at the stem tip, with long leaf-like bracts at the base.
The spikelets are partly tinged blood red, linear, about 1.5–3 cm long and 0.2 cm wide, and glossy.
The fruit is oblong and has 3 ridges.

[Uses]
The swollen part of the rhizome is called kobushi and is used medicinally.

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