100 ALIEN FLORA OF BRITAIN 



Achillea tomentosa, L. An alpine perennial of 

 Southern Europe, which has occasionally been found 

 near gardens in a semi-wild state. 



Ambrosia artemisiaBfolia, L. A native of North 

 America which apparently reaches this country with 

 agricultural seed and with grain, for it has been recorded 

 from scattered localities all over England in waste and in 

 cultivated land. 



Ambrosia maritima, L. A native of the Mediterranean 

 region, and a weed of cultivated and waste ground 

 in many parts of Europe. In England it has been 

 recorded in one or two stations in connection with 

 other grain importations. 



Ambrosia trifida, L. A North American species, 

 recorded several times in connection with imported 

 grain in England. 



Anacyclus clavatus, Pers. A native of the Medi- 

 terranean region. Common as a weed of arable land 

 in some parts of Europe, and recorded rarely as a grain- 

 sifting alien in England. 



Anacyclus radiatus, Loisel. A weed of the Medi- 

 terranean region. Once recorded in England in 

 connection with other grain-imported species. 



Anaphalis margaritacea, Benth. and Hook. f. Native 

 of dry woods in North America. It is an old favourite 

 in cottage gardens, and has been recorded as well 

 established in several localities in England, in the 

 neighbourhood of, or on the site of, gardens. 



