Johnson and Hensman — Agricultural Seeds, Sfe. 449 



West European. (Great Britain, N. France, Netherlands.) 



Ahpecurus agrestis, L. [A. myosuroides, Huds.), is a typical weed, 

 usually found without the glumes, as the naked cari/o^jsis in red clover 

 and in grasses. 



Carum Petroselinum, Benth. et Hook. {Petroselinum segetum 

 Koch.), occurs in French red clover. Certain of the West European 

 weeds are winter-green or winter-annuals, but incapable of standing the 

 severer winters of East Europe. Such are, Stebler states, Alopecurus 

 agrestis, L., Valerkmella dentata, Poll. ( Valericmella Morisonii, DC), 

 Geranium molle, L., G. pusillum, L., G. dissecium, L. 



North American. (United States and Canada.) 



Since the American weeds flower late, and are rarely ripe in 

 Mid-Europe when the European crops in which they may be growing 

 are out, the presence of American weed-seeds in a sample is a reliable 

 sign of the American origin of the seed. Sucli are Panicum capillare, 

 L., P. dichotomiim, P. virgatum, P. clandestinnm, L., Paspahim ciliati- 

 foliiim ; Ciiscuta arvensis, Beyr. (in red clover occasionally, and in 

 lucerne); Plantago aristata. Gray, in red clover and meadow fescue; 

 Ambrosia artemisiifolia, L., and A. trifida, L. ; Rudbeckia hirta, L., in 

 Timothy, and many others. 

 Australian. (Australia and New Zealand.) 



Agrostis Forsferi, R. & S., in meadow foxtail, A. avenoides, 

 Hook, f., and Danthonia semi-annularis, R. Br., are source-indicators. 

 Stebler makes the interesting observation that native plants of New 

 Zealand adapt themselves badly to cultivation, and are therefore rarely 

 found in New Zealand seeds. The alien weeds, however, thrive so 

 well that New Zealand cocksfoot is rarely distinguishable from Mid- 

 European. Holciis laiiatus, L., Bronms mollis, L., and Hypochaeris 

 radicata, L., are frequent in New Zealand seed. The last-named is the 

 commonest weed in New Zealand. 

 Asiatic. (Syria, Turkestan.) 



Syrian seeds, often of little value, are coming into the market. 

 Ceiifaurea piicris, Pall., and Cusciita Arabica, Fres., are given as source- 

 indicators here. 



East European. (Austria-Hungary, Russia.) 



East European seeds are difficult, Stebler states, to distinguish from 



. Mid-European, as the two regions merge into one another. Fui'ther, 

 East European weeds, such as Silene dichotoma, Ehrh., acclimatize 

 themselves in W. Europe more easily than do those of any other 



