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 virginicum) 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 
(Chetochloa viridis), five-finger (Potentilla monspelien- 
sts), curled dock (Rumex crispus), and lady’s thumb 
(Chenopodium album). 
New Zealand orchard-grass contains more or less 
seed of velvet-grass (//olcus lanatus), and its presence 
may be taken as good evidence of the origin of the seed. 
Chess (Bromus secalinus), ox-eye daisy (Chrysanthe- 
mum leucanthemum), slender-rush (/uncus tenuts), 
peppergrass (Lepedium virginicum), narrow-leaved 
plantain, five-finger, and sorrel are also frequently 
found. 
Kentucky blue-grass usually contains seed of some 
of the sedges (Cavex spp.), slender-rush, and often 
shepherd’s purse (Capsella 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 (Solanum 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 
