AQUATIC PLAINTS IN POND CULTURE. 



Fanwort {Cahoinha caroliniana) also is especially good as a food 

 producer, as a shelter, and for aquarium -work, and is given second 

 place. It is regarded as a good oxygenator and as fairly good for 



Fig. 3. — Homwort (Cera top hj/lhim drmersum). 

 Found in ponds and slow streams throug'hout 

 North America,, except extreme nortlu (After 

 Britten & Brown.) 



Fig. 4. — Fanwort (C'ahomhn. 

 carolimana ) . Found in ponds 

 and slow streams, southern 

 Illinois to Noi'th Carolina, 

 soutli to Florida and Texas. 

 (After Britton & Brown.) 



shade and, like the homwort, has little root anchorage and will grow 

 on hard bottom. It is found in 1 to 4 feet of water and extends 

 nearly to the surface. 



I-IG. .5.— Curled-lea ve<l pondweed 

 (Potamoyftoii o'ispun). Kound 

 in fresli, brackish, or even salt 

 water, Ma-ssachusett-s to Pennsyl- 

 vaJiia and Virginia. Also in Eu- 

 rope. (After Britton & Brown.) 



Fio. 6. — Leafy pondweed {PoUimogeton 

 folio.su-s). Niagara FaUs to Michigan 

 and California. (After Britton £; Brown. ) 



The curled-leaved pondweed {Potamogeton crispus), a good food 

 producer, oxygenator and aquarium plant, good for shelter, shade, 

 and ornament, is one of the earliest plants to put forth shoots, and is 



53391°— 23 2 



