14 AQUATIO PLANTS IN POND CULTURE. 
The six plants so far mentioned have been listed in the order of 
esteem as held by the superintendent of the Fish Lakes. The 
Fie. 10.—Water stargrass (Heteran- 
Fic. 9.—Waterweed (Philotria canaden- thera dubia). Found in still 
sis). Found nearly throughout North water, Ontario to Oregon, south to 
America, except extreme north. Florida and Mexico. Also in Cuba. 
(After Britton & Brown.) (After Britton & Brown.) 
remainder of the list for this station does not follow any par- 
ticular order, but, as before, the good or bad qualities the super- 
intendent believed the plants 
to possess are noted in each 
case. 
The waterweed (Philotria 
canadensis), which grows in 
2 to 4 feet of water, extending 
to, but not above, the surface, 
is a good food producer, a 
good oxygenator, good for 
shelter, and is valuable for 
its early growth. It also 
makes a good aquarium plant. 
It is dangerous in ponds, 
however, owing to its dense 
growth. 
Water stargrass (//eteran- 
thera dubia) has the same 
0 i 
4 Rie 
Fic. 11.—Needle spike-rush (Eleocharis acicu- merits as the waterweed. be- 
laris). Found in wet soil throughout North . 1 f 1 ] a 
America, except in extreme north. Also in ng a gooc ood producer, 
Europe and Asia. (After Britton & Brown.) fair oxygenator, and excellent. 
for the shelter it affords and for its early growth. It is found in 
water 1 inch to 4 feet deep. 
