6 
Proceedings of the Blologic(d Societg of Washington. 
ntahensis tlic western form.” In a. later letter (October 16) 
Doctor Ityclljerg further diacnsses the question, iind states that 
he lias a specimen of the Boulder county plant. 
In spite of this opinion, it seemed to me that both according 
to descriptions and herharium material the plants were not the 
same, although I was obliged to admit that some of the ai)- 
parent differences seen on comparing descidptions wei’e falla¬ 
cious. I accordingly ap])ealed to Mr. Geo. E. Osterhout, who 
was familiar with both forms in life. lie re[)lied (November 6, 
1013): “I had not thought that IMianthas fascindaris of the 
mountains and the Helianthus of the river and ditch hanks 
about liere (Windsor, Colorado) were the same. Doctor Ryd¬ 
berg in his Flora gives 11. grosseserratus as occurring at Fort 
Collins; now I do not think there is any other Helianthus 
growing about Fort Collins different from the one with which 
we are familiar.* . . . When Greene and Nelson described 
the mountain plant I supposed that it was a different species, 
and it seems to me that they must have thought so, for they 
must have been more or less familiar with the plant of the 
plains, which was going for H. grosseserratus. The plant along 
the river here grows in quite large clusters, the peduncles are 
short, and the stems large and stout. The mountain plant is 
slender, the peduncles are long, and few stems are found grow¬ 
ing together.” Mr. Osterhout further sends me a sheet of the 
plains plant, on which he had written long before the present 
discussion came up, ''Helianthus grosseserratus (what I have 
taken for that) does not have leaves ' hoary-downy l)eneath,’ 
nor are the scales ‘ slightly ciliate,’ nor does it grow on ‘ dry 
plains,’ as Gray’s Synoptical Flora says.” After prolonged 
consideration of the subject, 1 must agree with Doctor Rydberg 
that our plant is not II. grosseserratus, and with Mr. Osterhout 
that it is not II. fascicularis. It may therefore he separated as 
follows: 
Helianthus coloradensis .«p. nov. 
Perennial, fully six feet high, growing in chimps, heginning to flower 
early in August. Stems strict, very smooth, reddish, with a glaucous 
bloom. Leaves elongate-lanceolate, deep green, rough, with feebly and 
remotely dentate margins; nppi'r leaves alternate, lower op])osite. Tn- 
volucral bracts very long and slemler, about 1(5 mm. long, long-ciliate 
* Rydberg also records IT. fascicularis from Fort Collins.—T. 1). A. C. ^ 
