he subjected to farther cliangos, wliich ho destroy the identity of 

 tlie ])l;tiit that u butinist (inly ac(|Uaintcd with the species in its 

 native elinie, on seeing its waiideriiiir individuals iieie, hails the 

 discovery ol" an allied jdaiit rcijuiring a place in speciiic nomen- 

 clature. It is, however, a sui:;;,estive enquiry whetiier il" this n<;w 

 species or tlie variety were to liiid a tooting in the country whence 

 its proticnitors came, it would retain its identity as a species or 

 variety. Tlic whole subject merits some investigation as to how 

 tar, in any n^speet, climatic or other ditl'eiences produce p(rmanent 

 change. I cainiot, however, help here recalling some analogous 

 eases. The inland maritune plants, growing on tlie 

 shores of the Great Lakes and elsewhere, have been subjected to 

 a gieat change in their conditions of growth without any corres- 

 piimling alteration in the distinctive characters of the species. 

 Similar instances are recorded in the insect fauna of Lake 

 Superior, and our att;;ntion lias lately been drawn to Purls nipir 

 an intruding butterfly from Europe, extensively naturalized in 

 the Province of Quebec, which here even feeds on a plant dit!er- 

 ent from that which constitutes its food on the other side of the 

 Atlantic, and yet retains its specillc features unchanged. 



Li enumerating, in the catalogue below, species which have both 

 indigenous and introduced representatives in the country, I briefly 

 indicate the provincial range and habits of each plant as far as 

 known. Our knowledge of the habits and distribution of the grasses 

 in Ontario and Quebec is, however, so limited that I enumerate, 

 without any accompanying notes, sucli species as are probably 

 referable to this catalogue. Indeed, with respect to both this 

 and the other catalogues, I shall be glad to have the aid of 

 botanical friends in rendering our knowledge of the habits and 

 range of all of the spreading and naturalized plants more com- 

 plete. 



Jiiiniincitltis salcrdtiis, L. This plant is frequent in railway and 

 roadside ditches, and in wet places in old pastures and neglected 

 grounds. In range it is common from the Detroit Kiver and the 

 southern shores of the Georgian Bay to the Lower St. Lawerence, 

 and is native in the Hudson Bay Territory. In the two Pro- 

 vinces it probably chiefly occurs in the introduced state. 



Jinrhitrat vidrjiiris, li. Br., is often met with in gardens. Mr. 

 Barnston (Canad. Mat. 1851)) speaks of it as introduced or not 

 according to locality. The varieties are indigenous from Lake 

 Superior northward and westward. The plant is well known ia 



