66 FARM GRASSES OF THE UNITED STATES 



clover, but there are a number of kinds usually present. 

 In timothy the two most common weeds are pepper- 

 grass (^Lepidium virginiaini) and false flax {^Camelina 

 sativa) , the latter being abundant in Canadian seed and 

 especially difficult to clean out. In addition to these, 

 timothy often carries sorrel {Rumex acetosella) , narrow- 

 leaved plantain {Plantago lanceolata), green foxtail 

 {ChcetoMoa viridis), five-finger (^Potentilla monspelien- 

 sis), curled dock {Rumex crispus), and lady's thumb 

 {Chenopodium alburn). 



New Zealand orchard-grass contains more or less 

 seed of velvet-grass (^Holcus lanatus) , and its presence 

 may be taken as good evidence of the origin of the seed. 

 Chess {Bromus secalinus), ox-eye daisy {Chrysajithe- 

 -mum leucanthemurn) , slender-rush {/uncus tenuis), 

 peppergrass {Lepedium virginicuni) , narrow-leaved 

 plantain, five-finger, and sorrel are also frequently 

 found. 



Kentucky blue-grass usually contains seed of some 

 of the sedges {Carex spp.), slender-rush, and often 

 shepherd's purse (Ca/'i'«//fl bursa-pastoris) , chickweed 

 {Cerastium spp.), peppergrass, and sorrel. 



Dealers frequently attempt to distinguish Canada 

 from Kentucky blue-grass by running the hand into the 

 seed to see if Canada thistle spines are present. As Ken- 

 tucky blue-grass frequently contains spines of horse- 

 nettle {Solamim carolinense), which closely resemble 

 those of Canada thistle,, this test cannot be relied upon 

 and is apt to be misleading. Contrary to the common 

 belief, Canada blue-grass seldom contains seed of 

 Canada thistle, although the spines are usually present. 

 While the seed is much easier cleaned than that of 



