
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 1s known to aquariists as Wild 
Ludwigia, and the sometimes crisped leaves somewhat resemble the 
cultivated L. mulerttii. 
Ludwigia mulerttit, 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 ZL. palustris and the 

ees, ne 
FIG. 119. Cylindric-fruited Ludwiga, FIG. 120. Mulertt’s Ludwigia, Ludwigia 
Ludwigia glandulosa. Reduced miulerttii. Reduced one third. 
one-third, 
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 
193 
