Fimbristylis littoralis var. littoralis (grasslike fimbry, "Hideriko")

Japanese name: ヒデリコ （日照子）
Scientific name: Fimbristylis littoralis var. littoralis

[Overview]
An annual 10–60 cm tall, found on lowland riverbanks, in rice paddies, and in sunny wetlands.
It is hairless throughout.
It has no rhizome and grows in tufts.
The stem is flattened, four-angled, and smooth.
The leaves are basal, arranged in two rows, soft, narrow at 2 mm wide, and flattened from the sides.
The leaf sheaths at the base of the stem are pale to brown, flattened, and have no blades.
The inflorescence branches arising from the stem tip divide several times and bear many spikelets.
The inflorescence branches have short leaf-like bracts.
The spikelets are ovate-round, 2.5–4 mm long, and reddish brown.
The stigma branches in three.
The fruit is obovate, 0.6 mm long, three-ridged, and glossy white.

[Notes]
The Japanese name is said to derive from the plant's ability to grow thickly even in drought.

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