(First upload on December 22 2007. Last on August 25 2019) [ 日本語 | English ]

Commelina communis L.

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

⇒ Engler's syllabus (エングラー体系)

Commelinaceae Mirb. (ツユクサ)

ca 40 genera, and > 650 spp. worldwide, mostly in tropical and temperate regions
Commelina L. (ツユクサ)
Gibasis Raf. (ヒメトキワツユクサ)
G. pellucida (M. Martens et Galeotti) D. R. Hunt (ヒメトキワツユクサ)
Pollia Thunb. (ヤブミョウガ)
Tradescantia L. (ムラサキツユクサ)

Commelina L. (ツユクサ)

ca 170 species worldwide
Species in Japan

C. benghalensis L. (マルバツユクサ): west to Honshu

C. diffusa Burman fil. (シマツユクサ): Below Kyushu (annual)
C. auriculata Bl. (ホウライツユクサ): Western Honshu
C. communis (ツユクサ): East Asia

Commelina communis in Hokkaido

Tsuyukusa (ツユクサ, 露草), Asiatic dayflower
Lifeform: weedy, annual forb
Distribution: east Asia (including Japan) - northeastern America
Habitat: roadsides, croplands, etc.

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

var. hortensis Makino (オオボウシバナ)

f. candida Hiyama (シロバナオオボウシバナ)

var. ludens (Miq.) C. B. Clarke (ホソバツユクサ)
f. albiflora Makino (シロバナツユクサ)
f. ciliata Pennell (ケツユクサ)
f. miranda Hiyama (ウサギツユクサ)
f. hebespatha (Nakai ex H.Hara) Sugim.

[Tradescantia ohiensis (ムラサキツユクサ)]


Commelina1 Commelina2 Commelina3 Commelina4
Commelina5 Commelina6 Commelina7
[1] at Toya Lake Station, Hokkaido University, on August 21, 2007. The seed has a specific pattern on germination. [2/3] in a waste land near Muroran Marine Station, Muroran City, on September 12 2016. [4] near Ishikari Coast in the Road Station "Ai-rodo (I-Road) Atsuta" on August 19 2019. [5-7] A parking lot along a radoside at East Ward in the city of Sapporo on August 30, 2008. Records: on a trail adjacent to Toyonaka Park along Shojin River, Sapporo, on September 18 2021.