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(Upload on January 4 2017) [ 日本語 | English ]

Spirodela Schleid. (ウキクサ)

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Aquatic plants S. oligorrhiza (Kurz) Hegelm. (ヒメウキクサ), Africa, Australia, southern Asia (exotic to Japan) S. polyrrhiza (L.) Schleid.

S. punctata (G. Mey.) C. H. Thomps., South America, Central America, West Indies (syn. Landoltia punctata (G. Mey) Les et D. J. Crawford), dotted duckweed S. sichuanensis M. G. Liu et K. M. Xie, southern China

Spirodela polyrhiza in Hokkaido

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Ukikusa (ウキクサ, 浮草), great duckweed Lifeform: annual aquatic forb Distribution: cosmopolitan between tropical and temperate regions Habitat: stagnant water, e.g., ponds and paddy fields Leaf: face = green, reverse = red-brown Root: 5-12 per thallus Reproduction: mostly depending on vegetative reproduction, developing dormant buds by winter Genome: analysis completed in 2014

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[1-3] at a small artificial pond in the Sapporo City Nature Education Park on September 19 2016. The small leaves are Lemna minor.