480 COMPOSITAE (COMPOSITE FAMILY) 



Both ray and disk florets are fertile ; bracts of the involucre in a 

 single series, strongly keeled, and hairy. Disk achenes are oblong, 

 wedge-shaped, and four-angled, those of the rays longer and curved. 

 As soon as ripe they fall readily from the receptacle, and nearly 

 matured plants should never be left on the ground when cut as the 

 seeds ripen on the stalks. 



Means of control 



Prevent seed production by close and repeated cutting through- 

 out the growing season. 



GALINSOGA 



Galinsdga parviflbra, Cav. 



Introduced. Annual. Propagates by seeds. 



Time of bloom: June to November. 

 Seed-time: July to December. 

 Range : Massachusetts to Oregon, south- 

 ward to Georgia and Mexico. 

 Habitat : Gardens, roadsides, and waste 

 places. 



An immigrant from South America 

 which has also crossed the ocean and 

 been reported as troublesome in southern 

 Europe. Stem one to two feet tall, 

 pale green, slender, many-branched and 

 spreading, sparsely clothed with ap- 

 pressed hairs. Leaves opposite, ovate, 

 thin, three-nerved, scallop-toothed, acute 

 at apex, the lower ones narrowing to 

 slender petioles, the upper ones sessile 

 or nearly so. Heads, hardly a quarter- 

 inch broad, solitary on short, slender 

 peduncles, terminal and in the upper 

 axils; rays white, very short, three- 

 toothed, pistillate, fertile; disk-florets 

 yellow, perfect, and fertile ; bracts of 



FIG. 333. Galinsoga (Ga- the involucre smooth, the outer row 

 linsoga parmfiora). x I shorter. Achenes very small, dark, 



four-sided, wedge-shaped, finely hairy. (Fig. 333.) 



