18 



AQUATIC PLANTS IN POND CULTURE. 



The water chestnut {Trapa natans), 



Fig. 21. — Water chestnut {Trapa natans). Nat- 

 uralized in ponds, eastern Massachusetts and 

 near Schenectadj', N. Y. Native of Europe. 

 (After Britton & Brown.) 



ponds maintained for angling, however 

 purjDoses, these plants should 

 not prove undesirable except 

 in depths of less than 4 feet ; 

 though not without due con- 

 sideration of local conditions 

 should the fennel-leaved 



and the water 



introduced, owing 



dense growth at 

 deep 



though fairly good as a food 

 producer and for shelter, 

 shade, and ornament, is of 

 negative value in fish cul- 

 ture. 



The lotus (Nelumho lutea) 

 is troublesome to the pond 

 culturist, having bulbs ex- 

 tending 3 feet into the mud 

 and being accordingly dif- 

 ficult to remove Avhen not 

 desired. It is, however, very 

 ornamental, good for shade, 

 and fairly good for shelter. 

 Had it been possible, Mr. 

 Green states, he would have 

 eradicated from this station 

 the waterweed, the water 

 chestnut, the fennel-leaved 

 pondweed, the duckweeds, 

 and the water clover. In 



, rather than for propagating 



pondweed 

 clover be 

 to their 

 the surface 

 water. 



even m 



WYTHEVILLE, VA. 



Here the pond bottoms con- 

 sist of a rich loam to a depth 

 of 12 inches, and the range 

 in water temperature during 

 the summer months is from 

 70° to 85° F. The following 

 list of plants gives the opinion 

 of the superintendent, Mr. 

 George A, Seagle, as to their 

 respective qualities and characteristics 



Fig. 22. — Lotus {Xchimho lutea). Found locally 

 in Ontario and southward to Florida, west to 

 Michigan, Indian Territory, and Louisiana. 

 (After Britton & Brown.) 



The preceding lists have not 



