30 
BULLETIN 465, U. S. DEPARTMENT OF AGRICULTURE. 
Well-developed tubers of the cultivated variety average about 
three-fourths of an inch in length by three-eighths of an inch in 
diameter when dried. Tubers from wild plants are usually much 
smaller and have a greater proportion of fiber. The general appear- 
ance of chufas and of tubers from a wild sedge is well shown in 
figure 28. 
Chufas are known also hj the vernacular names earth almonds 
and ground nuts, and the plant as nut grass and cache-cache. 
Fig. 28. — Tubers of wild and cultivated chufas. (Natural size.) 
DISTRIBUTION. 
The northern boundary of the natural range of the chufa is marked 
b} r the following localities: Southern Xew Brunswick, southern 
Ontario, northern Nebraska, Xew Mexico, Arizona, and the Columbia 
River valley. The plant seems to be absent from most of the Great 
Basin and Rocky Mountain regions. From its northern limit the 
plant ranges southward over the remainder of the continent. (See 
