Statistics of the Flora of the Northern States. 69 
but if there restricted to similar situations, I should consider it 
= of the species unwittingly introduced by man from Europe. 
Poa compressa here has wholly the appearance of a pag 
Ea Richardson and Drummond gathered it also on the Sas- 
ohm pr know not in what stations. E. Meyer records it as 
ioe s caninum, like the common Couch-Grass (7° repens), as 
it generally occurs with us, is evidently of European derivation ; 
but both species are indigenous from our northern borders north: 
ward and westward. 
The White Clover (Trifolium repens) which springs - so copi- 
ously and promptly wherever pte are destroyed and the land 
turned into pasture, is in the e category, being wild at the 
north and the far West, oa gudcitbielly imported likewise at 
the settlement of the coun 
astium arvense, m4: saiiahiy of Acorus Calamus also, we 
have within our limits both an indigenous and an introduced stock. 
With Anacharis Canadensis it is not certain that the German 
and Russian plant is identical, the flowers being unknown there : 
nor, if so, are we sure that the lant is truly indigenous on the 
continent of Europe any more than in England, although it is 
very likely to be 
Platanthera bracteata is placed upon the list, although with 
doubt, Dr. Lindley and Sir Wm. Hooker having ee en the 
opinion that it is identical with P. viridis of 
war 
such by Hooker. I think I have seen specimens from Lower 
Canada. But no more northern habitats are icaowhe except t Mi- 
chaux’s, i.e. Lake Mistassins and Hudson’s Bay, sa lat. 51°. It 
ra ought to grow in es bere it is now. ere recorded 
at region, nor from Gree: 
rt ngu. we an Eastern North American plant not 
fered are 55°, but per; aa reappearing only in a 
few cairns ent ee notice 
not along the coast that mast of the = of this list attain their 
sete We should expert.’ this, as regards the eastern 
