The introduced flora of Crater Lake National Park 

 F. Lyle Wyni) 



Previous to the year 1896, very few people had visited 

 Crater Lake. This fact, together with its isolation from the main 

 lines of travel, caused the flora of the immediate vicinity of the 

 Lake to be almost entirely of native species. 



In August, 1896, Frederick V. Coville spent seven days with 

 the Mazama Mountain Climbing Club of Portland Oregon, 

 botanizing the region. He published a list of his plants in 

 Mazama Vol. L No. 2, 1896. Speaking of Rumex Acetosella L., 

 he says, "This, the only introduced plant seen at Crater Lake, 

 was found sparingly near the upper camping place." 



The localities studied by Coville and his collecting compan- 

 ion, John B. Leiberg, were the ravine of Pole Bridge Creek, 

 along the road from this point to the Rim of Crater Lake, along 

 the Rim as far east as a point midway between Applegate Peak 

 and Castle Crest, as far west as the Watchman and Red Cone, 

 down the outer slope of the crater south of the Watchman to 

 the line of springs at its base, down Anna Creek about one and 

 a quarter miles from the Rim, down the inner slope of the 

 Crater to the water's edge, and on Wizard Island. 



In the seven days between August 13 and August 20, it was 

 not possible for him to make a complete survey, but the single 

 introduced species noted above indicates that at that time very 

 little change in the native flora had taken place. 



The writer spent several summers in carrying out an inten- 

 sive botanical survey of the Park. A number of introduced 

 species was discovered. It is to be expected since about 150,000 

 people visit the Park each summer, most of them driving their 

 cars from every part of the United States, that the number of 

 accidentally introduced species would continually increase. The 

 list which follows is complete for the introduced species to the 

 end of 1930 in so far as the author's collections go. 



Rumex Acetosella L. This very widely distributed weed was 

 the first to establish itself at Crater Lake. It was first noted in 

 1896. 



Chenopodium album L. This plant first came to Crater Lake 

 in horse feed freighted in during the governmental construction 



