﻿Western North America 271 



Erigeron concinmts. It was first thought to be a new species, and 

 was distributed without specific name. It is not at all like the 

 specimen in the herbarium of Columbia University, which Dr. 

 Torrey seemed to think was E. concinmts, neither is it the same as 

 much of the material which passes for this species. A careful in- 

 spection of the original description by Hooker & Arnott, convinces 

 me that our Idaho plant is the same as theirs, and in that case the 

 bulk of the so-called E. concinnus belongs to some other species, 



or is still undescribed. The following is the original description 



of Ditasis ? concinna : 



" Toto pilis albidis patentissimis canescenti-strigosa, radice 

 perenni collo multicipiti, caulibus erectis gracilibus angulatis 

 ramosis, foliis linearibus basi attenuatis radicalibus sublonge 

 petiolatis, involucri foliolis subulatis albidis dorso viridibus, radii 

 flosculis uniserialibus numerosis anguste linearibus disco duplo 

 longioribus, pappo conformi biserali, serie ext. brevi paleacco, int. 



8-10 setoso." 



" Of the genus of this most beautiful plant, we are uncertain. 

 The slender stems, scarcely a span high, the copious foliage, pe- 

 duncles and involucres, are everywhere hoary with harsh white 

 spreading hairs. The flowers are about the size of a daisy ; the 

 rays bright blue, in the dried plant, and the disk, yellow. The 

 outer pappus consists of five or six lanceolate short palae ; the 

 hairs of the inner row are equal in thickness throughout." 



Our specimens are slightly over a " span " in height, as a rule, 

 although not always so, and are covered with a profusion of 

 beautiful, bright blue flowers. They also answer throughout to 

 the above description. The original was collected on the " Snake 

 River, below the Salmon Falls, Snake Country," by Mr. Tolmie. 

 The Salmon Falls are some 250 miles southeast of Lewiston, but 

 apparently in the same basalt formation. 



University of Minnesota, 



Minneapolis, Minn. 



