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- n. Plural form of duckweed.
Sorry, no etymologies found.
Some, even help to control pest populations; duckweeds are known to reduce mosquito numbers, which has the added benefit of decreasing the incidence of certain insect-borne diseases.
He drew her farther on to a small pool where duckweeds made a greenness on the water.
In the order of aroids, from the calamus-root or sweet flag, with its small but complete flowers, up to the reduced duckweeds (_Lemna_), almost an unbroken line of intermediate steps may be traced showing everywhere the concurrence of progressive and retrogressive evolution.
Most of the waterbodies were found covered with duckweeds, an indicator of high metals in the water.
Pre-culture: Afterwards, duckweeds from the liquid stock-cultures were grown in two glass vessels with 1.8 L of moStM each in the second identical growth chamber for three to four weeks prior to the experiments in order to obtain large numbers of plants.
Inst. ETH, Stiftung Rübel., or duckweeds - a review of the descriptive and experimental literature.
The data were analysed in randomised groups of six beakers ( 'pseudo-treatments'), since six replicates for the controls are recommended in guidelines for ecotoxicological tests with duckweeds Furthermore, the variability of two calculation parameters, frond number-related growth rate