III. INTRODUCED SPECIES. 119 



In attempting to account for these usual positions of the 

 plants two alternatives are presented. They may be na- 

 tive to the island, and requiring a soil manured or other- 

 wise affected by animal life ; and this soil they now find 

 chiefly near the abodes of man, since the number of wild 

 animals has been so much diminished. Or, they may be 

 plants which have accompanied man in his migrations, 

 and have thus got a rooting in this island through his 

 agency. We cannot now reject them from the British 

 flora, although their aboriginal nativity may be slightly 

 suspected, on account of their places of growth, or for 

 other reasons shortly expressed after their names in the 

 subjoined List : — 



Lepiflium campestre. Cultivated ground aud banks. 

 Bavbarea arcuata. Agrestal ; viatical. Elsewhere ? 



stricta. Local ; in or near inhabited places. 

 Sisymbrium Sophia. Near towns ; on rubbish heaps, &c. 

 Sinapis arveusis. Chiefly agrestal, like the colonists. 



nigra. Much cultivated. By roads and rivers. 

 Reseda Luteola. Often on dug ground, heaps, &c. 

 Silene anglica. Chiefly on cultivated ground. 

 Lychnis vespertina. Corn-fields chiefly ; hedge-banks, &c. 

 Holosteum umbellatum. On buildings ; and very local. 

 Malva sylvestris. Chiefly agrestal and viatical. 



rotundifolia. Way-sides, waste corners, &c. 

 Trifoliura ochroleucum. Perhaps a colonist originally. 

 Onobrycliis sativa. Local. Frequently sown in fields. 

 Lalhyrus Nissolia. Distrusted in N. France, by Dr. Godron. 

 Poterium muricatum. Chiefly agrestal. Also in turf? 

 Ribes alpinum. Not found in native forests, or on rocks ? 

 ^ithusa Cynapium. Cultivated ground ; rubbish heaps. 

 Conium maculatum. Rubbish heaps, &c., near houses. 

 Peucedauum officinale. Doubted by Professor Henslow. 

 Helminthia echioides. Distrusted in N. Fiance, by Dr. Godron. 

 Lacluca saligna. Rubbish heaps ; way-sides, (Sic. 

 Cichorium Iniybus. Agrestal ; viatical. 

 Cenlaurea Scabiosa. Corn-fields ; disturbed ground. 



