30 EAEE AND INTRODUCED SPECIES [CH. 



Aira prcecox (sandy and hilly pastures). 



Poa disiaiis (sandy wastes near the sea). 



P. compressa (dry, barren, waste ground). 



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



AgropT/mm repens (fields and waste places). 



Sordeum murinum (waste places and road-sides). 



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



H. mollis (same — rarer). 



Alopecunis agresHs (waste lands and roads in S. of England). 



Loliiim perenne (meadows, pastures and waste places). 



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



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



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



Poa rigida (dry, rooky 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 towns 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. 



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



Panicum sanguinale (S. England). 



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



P. glaucum. (rarely introduced). 



Hierochloe horealis (Thurso only). 



PhlevMX alpinum (Highlands only). 



