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 
Achilléa Pidrmica, 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. 
A one : 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, 
: Fie. 339. — §: = 
sharply and very finely toothed, sessile and ou yarrow ( Mehta 
partly clasping, often hairy on ‘the veins Ptarmica). x }. 
