THE AMERICAN BOTANIST 127 



here we again encountered our yellow saxifrage along the bor- 

 der of the paths and clinging to the 'rock-work- In answer to 

 our inquiries, the gardener assured us that it had never been 

 cultivated, and he had always regarded it in the light of a weed ; 

 but he was not aware of the extent to which it had invaded the 

 thickets below. 



On sending a specimen to the Gray Herbarium, it was 

 determined by Mr. J. Francis Macbride as Saxifraga Sib- 

 thorpii Boiss — a native of Greece, and not previously 

 reported in this country as an escape. Future collectors on 

 Elk Rock will doubtless encounter it and take it at first sight 

 for a native species, so thoroughly has it adapted itself to the 

 local environment. 



Another plant which we found only on the border of 

 the rock-garden, and which the g'ardener informed us had 

 also never been cultivated, was Corydalis lutca. Along with 

 this was a very small cruciferous plant with orbicular leaves 

 and tiny white flowers, the whole plant only a few centimeters 

 in height, which seemed to prefer the shaded soil under the 

 larger plants and against which the gardeners were waging 

 a vigorous campaign. The pods were hardly mature, but on 

 a second visit in July I found them well-developed. It appears 

 to belong to Car da/mine, but all efforts to determine the 

 species have thus far been fruitless. I am hoping that it may 

 survive the war of extermination and that another season may 

 enable us to identify this interesting immigrant. 



Another illustration of the ease with which foreign 

 species become established in Western Oregon was afforded 

 in the course of a collecting trip taken in June, 1017, by Profes- 

 sor M. E. Peck of Willamette University and the writer along 

 the Rogue River canyon in southwestern Oregon. On our 

 second day out from the railroad, in one of the most thinly- 

 settled and inaccessible sections of the State, where for a 

 distance of forty miles no wheeled vehicle had ever pen- 



