Geographical Distribution of Plants* 31 



itself by travelling so far westward as tlie Cucullaria. Neither of 

 them appear in the Hudson's Bay Company's Terr'tories. 



The D. formosa is a southern species, confined apparently to 

 the States of Virginia and South Carolina. The D. saccata of 

 Nuttall is the D. eximia of Hooker, and inhabits the shady woods 

 of the Oregon. 



The single species of the genus Adlumia I have never had the 

 pleasure of collecting, although it be native of Canada. Like the 

 Dielytras, it extends southwards into the States, but not to the 

 northward of the Province. 



Last to be mentioned as a genus of the Fumariacese inhabiting 

 British North America is Corydalis. The C. aurea has a very 

 extended range. It occurs throughout Canada to as far as Geoi- 

 gia, and westward from that to the Rocky Mountain, along the 

 Arkansas and Missouri. It is seen occasionally on the canoe route 

 into the far northwest, tufted among the spongy ground, where 

 springs spread over upon the rocks along shore. In the useful 

 tables of Sir John Richardson three species of Corydalis are as- 

 signed to the zone occupying the space from the Arctic circle to 

 72° north, or to the coast; this species must be one of these. 

 Possibly it does not enter this zone until it gets westward to the 

 banks of the Coppermine and McKenzie's Rivers. Drummond 

 found it in the Rocky Mountains from 52° to 5*7° north latitude. 



Corydalis glauca must be the other Corydalis that reaches the 

 Arctic circle in the eastern district. It is a more common plant 

 along our rivers than the C. aurea, and probably is as hardy. It 

 is met with generally in more exposed situations, and in drier 

 ground. It stretches from the north shore of the St. Lawrence, 

 from below the entrance of the Saguenay, extending itself through 

 Canada, and is met with as far south as North Carolina. In ca- 

 noe travelling in the interior of the north it forms an agreeable 

 object to the sight, often pendant upon the steeply inclined rocks, 

 rising out of the debris and moss collected in their clefts, its va- 

 riegated flowers and glaucous leaves, shewing to great advantage 

 upon the sombre back ground. 



The third Corydalis mentioned by Sir John as an Arctic species 

 should be the 0. paucijlora of Persoon. Kotzbue Sound is the 

 locality given it. This is near the island of St. Lawrence in Beh- 

 ring.s Sti aits, where Chamisso also noted it. Has it crept from 

 the Asiatic continent by taking passage on some navigating drift 

 stick, or has it had place on our continent before we were sepe- 

 rated from Asia by some mighty throe of the volcanic elements ? 



