:30 RAKE AND INTllODUCED SPECIES [CH. 



Aira pnicox (sandy and billy pastin-es). 



Poa distam (sandy wastes near the sea). 



P. compo'essa (dry, barren, waste ground). 



P. annua (cultivated and waste lands and fields). 



Agropyrum repens (fields and waste places). 



Hordeum murinum (waste places and road-sides). 



Holcm lanatus (meadow, pasture, and waste lands). 



H. mollis (same — rarer). 



Alopecitrus agrestis (waste lands and roads in S. of England). 



Lolium perenne (meadows, pastin-es and waste places). 



L. temidentum (fields and waste places, not common). 



Bromus sterilis (on way-sides, &c.). 



B. arvensis (cultivated and waste meadows and pastures). 



Poa rigida (dry, rocky places). 



It is also often useful to know whether a grass is rare 

 or local, especially for the purpose we have in view, and I 

 have therefore drawn up the following list of rare, local 

 or introduced foreign grasses either not noticed at all, or 

 only referred to incidentally in this work. 



In many cases these introduced foreign grasses have 

 sprung up from seeds brought over in cargoes of hay, wool, 

 and other products and packing materials, which in part 

 accounts for their occurrence only near certain sea-ports, 

 manufacturing tow^ns and so forth. Such plants are 

 frequently termed ballast plants. Foreign plants are 

 also introduced in seed, as mixtures or impurities, and 

 frequently escape from corn-fields &c. 



Leerda oryzoides (ditches of Hants., Sussex and Surrey). 



Panicuni sanguinale (S. England). 



P. verticillatum (fields in S. and E.). 



P. glaucwn (rarely introduced). 



Hierochloe horealis (Thurso only). 



Phleum alpinum (Highlands only). 



