SOME ERIGERON SEGREGATES. 199 



E. MEMBRANACEus Greene, Pitt. v. 294 (1898), was a seg- 

 regate of the confused E. salsuginosus of Gray's Synoptical 

 Flora, and is an ally of E. callianthemus , which does not reach 

 the Rocky Mountain region. In my description of the species 

 as based on Mr. Cusick's n. 1771, while depending on the 

 very ample and thin almost filmy leaves, I do not point out 

 that those of the stem are so broad at the point of insertion, 

 as to become amplexicaul, nor that the heads are smaller 

 than in E. callianthemus and the peduncles much less 

 pubescent. Mr. Cusick, in his attempt to collect and dis- 

 tribute new material of the species, after I had pub- 

 lished it, was not very fortunate. He took his specimens 

 from another locality. They are of hardly one-third the size, 

 and lack the characters of the species. I never should have 

 separated his n. 2112 from E. callianthemus, and that is what 

 I call it. But in the Blue Mountains of Oregon E. mem- 

 branaceus is the common species, and was collected there, also 

 in Mr. Cusick's year 1897, by Robert M. Horner, n. 262, and 

 by J. B. I/Ciberg, n. 2931 ; and even a year earlier, by 

 Mr. Piper in 1896, while in this year also Mr. Henderson 

 gathered it in Idaho, n. 3662. A specimen collected in the 

 Selkirk Mountains, B. C, by Mr. Shaw I confidently refer 

 here, and less so another from Clayton Peak, Wasatch Moun- 

 tains, Utah, for this has foliage too acute, also with here and 

 there a tooth. 



While the plant which I have named E. callianthemus, 

 forming a great part of the E. salsuginosus of Gray, and per- 

 haps all of that of Rydberg, occurs all the way between the 

 northern borders of New Mexico and southern British 

 Columbia, with E. membranaceus centered in the isolated 

 Blue Mountains and radiating thence into other sections of 

 that mountainous interior of the Northwest that lies to the 

 eastward of the coast ranges and is separate from them, there 

 is a large plant of the higher coast mountains of Washington 

 and Oregon also called E. salsuginosus by Gray and by 

 Howell, which has marks by which it stands aloof from my 

 E. callianthemus, such as we reasonably look for, when we 



