72 CYPERACEAE (SEDGE FAMILY) 



numerous, flattened, linear, eight to ten-flowered, spreading, in 

 loose oblong or ovoid heads ; stamens three ; style three-parted, 

 the branched tips exserted; scales straw-colored, oblong lance- 

 shape, strongly nerved, much longer than the slim, three-angled, 

 and pointed achene. (Fig. 36.) 



Means of control 



Drainage of the ground, followed by a cultivated crop very 

 thoroughly tilled so as to destroy the tuberous rootstocks re- 

 seeding heavily to red-top or timothy. 



BALDWIN'S CYPERUS 



Cyp&rus echinatus, Wood 



Native. Perennial. Propagates by 

 seeds and by rootstoeks. 



Time of bloom: July to September. 



Seed-time: August to October. 



Range : Virginia to Missouri, southward 

 to Florida and Texas. 



Habitat : Dry, sandy soil ; cultivated 

 fields, waste places. 



This Cyperus seems to prefer dry 

 and mellow soils, and often makes itself 

 troublesome in strawberry and melon 

 patches. It springs from short corm- 

 like rootstocks, the culms ten inches 

 to two feet high, slender, smooth, longer 

 than the leaves, which are pale green, 

 less than a quarter-inch wide, smooth 

 with rough edges ; the involucre has 

 five to ten bracts, most of them much 

 longer than the umbel; the latter has 

 six to twelve unequal ascending rays, 

 the heads globose or slightly oblong, 

 usually about a half -inch in diameter; 

 spikelets twenty to forty, pale green or 

 FIG. 37. Baldwin's Cyperus somewhat yellowish, spreading, lance- 

 (Cyperus echinatus). x J. cylindric or only slightly compressed ; 



