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Common duckweed, <em>Lemna</em>. The entire plant is reduced to a leaf-like expansion which bears a long slender root and small flowers; forms green floating scum on ponds and stagnant pools.

Duckweed

Common duckweed, Lemna. The entire plant is reduced to a leaf-like expansion which bears a…

Duckweed is the common name of lemna minor. The fronds are usually cohering in threes and fours. The fronds are rather thick.

Duckweeds

Duckweed is the common name of lemna minor. The fronds are usually cohering in threes and fours. The…

Pictured are floral details of lemna minor, a variety of duckweed. (aa) stamens and (b) pistil.

Lemna Minor

Pictured are floral details of lemna minor, a variety of duckweed. (aa) stamens and (b) pistil.