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Encyclopedia Britannica



DUCKWEED

This article appears in Volume V08, Page 632 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: DRO-ECG
DUCKWEED , the common botanical name for species of Lemna which form a green coating on fresh-water ponds and ditches. The
plants
  are of extremely simple structure and are the smallest and least differentiated of flowering
plants
 . They consist of a so-called " frond "a flattened green more or less
oval
  structure which emits branches similar to itself from lateral pockets at or near the base. From the under surface a root with a well-
developed
  sheath grows downwards into the water. The
flowers
 , which are rarely found in Britain, are
2 Probably from " cuck," to void excrement; but variously connected with Fr. coquin, rascal.
developed
  in one of the lateral pockets. The inflorescence is a very simple one, consisting of one or two male
flowers
  each comprising a single stamen, and a
female
  flower comprising a
flask
 -shaped pistil. The order Lemnaceae to which they belong
1, Lemna
minor
  (Lesser
Duck
 - stamen, and a
female
  flower,
weed
 ) nat. size. the whole enclosed in a
2, Plant in flower. sheath.
3, Inflorescence containing two 4, Wolffia arrhiza. male flcwers each of one (2, 3, 4 enlarged.)
is regarded as representing a very reduced type nearly allied to the Aroids. It is represented in Britain by four species of Lemna, and a still smaller and simpler plant, Wolffia, in which the fronds are only one-twentieth of an inch
long
  and have no roots.


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