AQUATIC PLANTS OF FRESHWATER 



red midribs and nerves. Grows abundantly in ditches, streams and ponds 

 in the entire eastern and western sections of the United States. Flowers 

 June to November. 



Ludwigia glandulosa (Linn.) or Cylindric-fruited Ludwigia, Fig. 119, 

 has larger, more acutely spatulate leaves than the foregoing, and is a very 

 abundant form in still water along the Atlantic coast line. The seed car- 

 pels are either ovate or round in form. It is known to aquariists as Wild 

 Ludwigia, and the sometimes crisped leaves somewhat resemble the 

 cultivated L. mulerttii. 



Ludwigia mulerttii, or Mulertt's Ludwigia, Fig. 120, is said to be a 

 South American species, introduced as an aquarium plant by Mr. Hugo 

 Mulertt. The leaves are more lance-oblong than L. ■palustris and the 



FIG. 119. Cylindric-fruited Ludwiga, 



hadiuigia glandulosa. Reduced 



one-third. 



FIG. 120. Mulertt's Ludwigia, Lud'wigia 

 mulerttii. Reduced one tliird. 



brilliant coloring more permanent. The flowers are yellow. This plant 

 has become widely distributed among growers of aquatic plants and is 

 highly prized for its fine appearance and graceful habit in the aquarium. 

 It is easily propagated from cuttings. 



Ludwigia alternifolia (Linn.) or Alternate-leaved Ludwigia, is an erect 

 semi-aquatic shrub and a fine foliage plant which grows to a height of 2 to 



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