IMPROVEMENT OF GRASS LAND 169 



fruits bear hooked bristles. 

 Wild Chervil (A. sylvestris), 

 on the other hand, is <i 

 perennial, flowering in 

 April to June. The um- 

 bels of white flowers are 

 terminal (Fig. 45), and 

 the fruits smooth. Where 

 these two plants are plenti- 

 ful they should be regu- 

 larly cut before seeding 

 takes place, a plan which 

 soon materially reduces 

 them, for both are spread 

 by seed. As the growth 

 of A . sylvestris is stated * to 

 be greatly promoted by 

 nitrate of soda, the use 

 of this manure should be 

 avoided where the plant 

 occurs. Superphosphate 

 and kainit promote the 

 growth of clover and cer- 

 tain grasses, which help 

 to choke out the weed ; 

 2 to 3 cwt. of each may 

 be applied per acre. If 

 the weeds occur in 

 meadows, the hay should 

 be cut as early as possible. 

 Cow Parsnip, Hog-- 

 weed (Heracleiini Sphon- 



dylium L.)._ This (Fig. 46) FlG . 45 ._Beaked Parsley (Anihriscus sylvestris 

 is a Common and well- Hoffm.), x about . Flower enlarged. 



1 Jour. Bd. Agric^ 1907, p. 183. 



