Chi Lemna

Lemna là một chi thực vật có hoa trong họ Ráy
Lemna is a genus of free-floating aquatic plants from the duckweed family. These rapidly growing plants have found uses as a model system for studies in community ecology, basic plant biology, in ecotoxicology, in production of biopharmaceuticals, and as a source of animal feeds for agriculture and aquaculture.

Section Alatae

• Lemna aequinoctialis Welw. – Lesser Duckweed
• Lemna perpusilla Torr. – Minute Duckweed

Section Lemna

• Lemna gibba L. – Gibbous Duckweed
• Lemna minor L. – Common Duckweed
• Lemna trisulca L. – Ivy Duckweed

Section Uninerves

• Lemna minuta Kunth – Least Duckweedlemna-minuta----lemna-minor
• Lemna valdiviana Phil. – Valdivia Duckweed

Formerly placed here[edit]

• Landoltia punctata (G.Mey.) Les & D.J.Crawford (as L. oligorrhiza Kurz and L. punctata G.Mey.)
• Spirodela polyrhiza (L.) Schleid. (as L. polyrhiza L.)
• Wolffia arrhiza (L.) Horkel ex Wimm. (as L. arrhiza L.)

Wolffia arrhiza (smaller leaves) and Lemna minor (larger leaves)
lemma-biloba
Lemna minima Chevall.