COMPOSITAE (COMPOSITE FAMILY) 



487 



Cattle usually avoid the plant when green, but sometimes eat it 

 with dry fodder, and then it is very damaging to the quality 

 of dairy products. Flowers in dense, flat-topped, stiffly branched, 

 compound corymbs, the heads very small, white or sometimes 

 pink ; rays and disk-florets both fertile ; bracts of the invo- 

 lucre, imbricated, with scarious margins. Achenes flattened 

 oblong, without pappus. (Fig. 338.) 



Means of control 



The rootstocks are horizontal and tough, and cling rather 

 strongly to the parent plant, so that sometimes when the ground 

 is soft one may oust a whole colony at a pull the young shoots 

 of the first year being mere tufts of plume-like leaves. Prevent 

 seed production by close cutting before the 

 first flowers mature. In cultivated crops the 

 weed is suppressed by the required tillage. 



SNEEZEWORT YARROW 

 Achilla Ptdrmica, L. 



Other English names : White Sneezeweed, White 



Tansy, Wild Pellitory. 

 Introduced. Perennial. Propagates by seeds 



and by rootstocks. 

 Time of bloom: July to September. 

 Seed-time: August to October. 

 Range: Newfoundland and New Brunswick 



to Michigan, southward to Massachusetts. 

 Habitat : Moist soil ; low meadows, and waste 



places. 



The range of this weed has increased of 

 recent years, chiefly by the agency of baled 

 hay. Stem slender, one to two feet tall, 

 rather rigid, smooth or only slightly hairy, 

 sometimes branched at the top but usually 

 simple. Leaves alternate, one to three inches 

 long, narrow lance-shaped to linear, pointed, 

 sharply and very finely toothed, sessile and 

 partly clasping, often hairy on the veins Ptarmica). x J. 



