18 BULLETIN 205, U. S. DEPARTMENT OF AGRICULTURE. 
DISTRIBUTION. 
Wigeon-grass is a brackish-water plant. It grows in salt water, 
but probably never in that of full ocean strength. It also grows in 
water that passes for fresh, as in the upper part of Currituck Sound, 
Fig. 15. — "SYigeon-grass. 
North Carolina, but inlets from the ocean to this part of the sound 
have existed in recent years and high tides at times cross the narrow 
beach. Salt in the soil or salt springs, even if covered by fresh water, 
also give wigeon-grass the conditions necessary for existence; this 
