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(First upload on December 30 2010. Last on August 1 2021) [ 日本語 | English ]

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

Juncus tenuis in Japan

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Tokyo

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

Hokkaido

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[1] near the Crane Site in Tomakomai Experimental Forest on September 17 2015. [2] along Fureai Course in Nopporo Forest Park on July 17 2021. [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

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[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

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