Lemnaceae

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Lemnaceae

[lem′nās·ē‚ē]
(botany)
The duckweeds, a family of monocotyledonous plants in the order Arales; members are small, free-floating, thalloid aquatics with much reduced flowers that form a miniature spadix.
References in periodicals archive ?
The duck weed remaining has been thinned out meaning the sun and rain can break through, which will improve the levels of oxygen in the water.
"It's a bit like a duck pond with green duck weed which puts oxygen back into the water so it can be released into the watercourse without being dangerous for fish and other underwater life." To conserve the energy used in the heating process, most breweries use a heat exchange, re-using energy stored from yesterday's brew to heat today's.
Duck weed, a flowering water plant which can double in size every two days, is behind the change and the recent warm spell has provided perfect growing conditions.
I was sorry to see that the fish ponds at St Fagans Castle are coated with duck weed. The several dozen ducks sitting on the banks were clearly covered with the stuff.
Even an old sink will suffice, though it is wise to remember that in small pools in particular, a good covering of duck weed or a small shallow rooted waterlily is important to cut out excessive sunlight, which when combined with the mineral salts present in tap water, is a recipe for water which resembles pea soup.
With a simple dipping net - the kind that children use in ponds and streams - scoop off any duck weed that may have grown.
The duck weed got pushed together and the fish bunched under it.