

TORREYA '^""^ 



Vol. 20 No. 3 



May-June, 1920 



ADDITIONS TO THE FLORA OF WESTERN OREGON 



DURING 1919 



By James C. Nelson 



It has been possible to continue the examination of our flora 

 during the past season along the lines suggested in my previous 

 notes (Torreya 18: 21-35; ib. 220-226. 1918). It was pointed 

 out at that time (i) that the boundaries established in Piper & 

 Beattie's Flora of the Northwest Coast were very easily crossed 

 by indigenous species of adjacent range; (2) that our climate and 

 soil are so favorable to the introduction and spread of foreign 

 species that a steady increase in our plant-population may be 

 expected from this source. The following notes on the collections 

 of the past season may serve to verify both of these propositions. 

 In the matter of native species, I was able to study three regions 

 which may be regarded as natural avenues of ingress. One of 

 these was the Calapooia Range along the southern boundary of 

 Lane County, which was selected by Piper and Beattie as marking 

 the southern limit of their Flora. I had ventured the assertion 

 (Torreya 18 : 23) that this seemed a very slight barrier to inter- 

 pose to the northward extension of the Californian flora. But 

 I had not at that time visited the region, and knew nothing of its 

 topography in detail. In June of the present year (1919), 

 I made my headquarters at Cottage Grove, within two hours' 

 walk of the Calapooias, and worked along the range for a total 

 distance of some thirty miles east and west. I found it of very 

 moderate elevation, the highest summit visited reaching only 

 2,200 feet, and pierced by two main arteries of travel, the South- 

 ern Pacific Railway and the Pacific Highway, not to mention 

 many minor roads and innumerable trails. Just where the 



[No. 2, Vol. 20, of Torreya, comprising pp. 17-36, was issued 4 June, 1920.] 



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