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(First upload on December 30 2010. Last on September 1 2019) [ 日本語 | English ]

Juncus tenuis Willd.






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

Juncus L. (イグサ)
Kusai (クサイ, 草藺), poverty rush/path rush/slender rush
Shiranei (シラネイ, 白根藺)
Lifeform: weedy, perennial rush < 60 cm high
Distribution: cosmopolitan (ancient exotic to Japan?)
Habitat: roadsides, cropfields, uplands, etc. (tolerant to soil compaction by developing shallow roots)

Field training on integrated environmental research (統合環境調査法実習) (fauna and flora 種リスト)

Seed dispersal: animal (ectozoochore )
Chromosome number: 2n = 30, 32
Juncus dudleyi Wiegand (アメリカクサイ, dudley slender rush), exotic to Japan
Synonyms:

Juncus macer Gray
Juncus tenuis Willd. var. williamsii Fernald
Juncus tenuis Willd. var. multicornis E. Mey. (USDA)
Juncus tenuis Willd. var. nakaii Satake

索引

Juncus tenuis in Japan


Tokyo

ST1 ST2
[1/2] at the imperial gardens in the former lawn (Shiba) detached palace, Tokyo, on May 29 2015.

Hokkaido

ST1 ST2 ST3
ST4 ST5 ST6
[1] near the Crane Site in Tomakomai Experimental Forest on September 17 2015. [2/3] along a roadside, N27/E2, East Ward, Sapporo on June 15 2011. [4] along a roadside south to the Botanic Garden of Hokkaido University, Sapporo, on July 13 2016. [5] along a paved road in N10/W5, North Ward, Sapporo, on July 16 2019. [6] along a roadside in the city of Sapporo on July 12 2014. Records (many more): along a roadside in the city of Sapporo on August 29 2009, and at Toya Lake Experimental Station on September 8 2009. Recorded: near the Crane Site in Tomakomai Experimental Forest on September 14 2017.

Mount Koma

ST1 ST2 ST3
ST4 ST5 ST6
[1-6] at the parking lot in front of the entrance gate of Mount Koma (⇒ flora). [1-3] on August 4 2015. [4-6] on August 27 2016.

Mount Usu

ST1 ST2 ST3
[1-3] in a Miscanthus sinensis grassland on the Nishiyama Craters on July 27 2017 (flora).

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