AQUATIC PLANTS OF FRESHWATER 



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differed in by authorities. Fishes 

 are not necessary to its growth, but 

 a few snails or tadpoles are required 

 to cabonate the water and to keep 

 down the algte and scum. 



Ouvirandra bernierianaj^^zx\?i}i 

 or Bernier's Madagascar Lace 

 Plant, is a sub-species having 

 leaves with smaller open spaces 

 and four-parted pinkish spikes. 

 The plant is usually smaller than 

 the foregoing. Both these species 



are grown in the Botanical Gardens fig. 139. Madagascar Lace Plant, Ou-virandra finestralU. 



at Washington and at the University of Pennsylvania. May be had of 

 dealers in aquatic plants. 



The water in which these plants are grown should be clean and clear 

 and should be kept at about 65° to 75° F. in a greenhouse. Despite the 

 delicate and lacelike appearance of the plant, the leaves are tough and will 

 stand rough handling. 



POND PLANTS 



The beauty of lakes, ponds and basins largely depends upon a tasteful 

 and picturesque arrangement of aquatic and semi-aquatic plants both in 

 the water and along the borders. A selection of different species of the 

 Nympheae or Water Lilies, the Nelumbiae or Lotuses, the Limnachari or 

 Water Poppies, and occasional groups of Trapacese or Water-nuts, Mar- 

 silea or Water Clover, Aponogetonse or Floating Cape Pond Weeds, 

 Limnanthemae or Floating Heart, and of Eichhorni or Water Hyacinths 

 will beautify the surface; and clusters of Cabomba, Myriophyllum, Pro- 

 serpinaca and Ludwigia the lower depths, except in the flowering season; 

 but care must be taken that these latter will not spread too greatly and 

 become a nuisance. Among all these there are hardy species which will 

 thrive perennially when introduced, especially if the ponds and lakes are 

 fed from natural springs that will not freeze solid in the winter. 



For the margins and borders a natural grouping of any of the native 

 hardy and readily obtainable Naiads, the semi-aquatic Sagittarias or 

 Arrowheads, the Water Lobelias, the Acorus or Sweet Flags or 

 Calamus, the Pontederia or Pickerel weeds, the Cypera and Papyruses 

 or Umbrella Plants, the Juncaceae and Cyperacese or Rushes and Sedges, 

 the Isoetes or Quillworts, the Orontium or Golden Club, the Peltandra 

 or Arrow arums, and the Rannunculi, which include the Water Crowfoots 



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