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(First upload on January 11 2012. Last on March 7 2018) [ 日本語 | English ]

[Engler's syllabus (エングラー体系), APG = Araceae (サトイモ)]

Lemnaceae (ウキクサ), duckweed

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Aquatic plants Lemna L. (アオウキクサ) Spirodela Schleid. (ウキクサ)

Wolffiella Hegelm., 10 spp. Wolffia Horkel ex Schleid. (ミジンコウキクサ), 11 spp.

W. arrhiza (ミジンコウキクサ), probably minimum seed plants of which oval body is 0.5 mm long

Lemna L. (アオウキクサ)

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Developing thallus (pl. thalli, 葉状体) that are not clearly divided into a stem and leaf because of the adhesion L. aequinoctialis Welw. (ナンゴクアオウキクサ) L. aoukikusa Beppu et Murata (アオウキクサ)

ssp. hokurikuensis Beppu et Murata (ホクリクアオウキクサ) L. gibba L. (イボウキクサ), exotic L. japonica Landolt (ムラサキコウキクサ) L. minor L. (コウキクサ) L. minuta Kunth (ヒナウキクサ)

L. perpusilla Torr. (チビウキクサ) L. trisulca L. (ヒンジモ), submerged (only reported from the Kurhiro Mire in Hokkaido) L. turionifera Landolt (キタグニコウキクサ) L. valdiviana Philippi (チリウキクサ)

Lemna minor in Hokkaido

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Koukikusa (コウキクサ, 小浮草), common duckweed or lesser duckweed Lifeform: evergreen aquatic forb → mostly dependent on asexual reproduction Distribution: cosmopolitan

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

1 2 3

4 5
[1-4] in an artificial pond in the Arboretum of Hokkaido University adjacent to Poplar Boulevard in the Hokkaido University campus. [1] on September 27 2011. [2] on May 20 2015. [3/4] on June 12 2015. [5] along the shore of Echigo Pond in Ebetsu City on October 8 2017.