Dense-flower spikerush

(Upload on September 5 2020) [ 日本語 | English ]

Eleocharis congesta D. Don

Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

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Eleocharis R. Br. (ハリイ)

E. congesta

Harii (ハリイ, 針藺, s.l.), dense-flower spikerush
Life form: annual/perennial sedge
Distribution: eastern Asia, including Japan
Habitat: swamps and streamsides
Stem: ≈ 0.5 mm in diameter
Chromosome number: 2n = 20
var. congesta (オオハリイ)

f. dolichochaeta T. Koyama (オオハリイ, s.s.)

Synonyms:

Eleocharis pellucida J. et C. Presl

var. japonica (Miq.) T. Koyama (ハリイ)
Synonyms:

Eleocharis japonica Miq.
Eleocharis congesta D. Don ssp. japonica (Miq.) T. Koyama
Eleocharis pellucida J. et C. Presl var. japonica (Miq.) Tang et F. T. Wang

var. subvivipara (Boeck.) T. Koyama (ヤリハリイ)

Eleocharis congesta in Hokkaido

var. congesta

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[1-3] on a sandbar along Toyohira River, Sapporo, on July 14 2020.