SOME ERIGERON SEGREGATES. 197 



Erigeron huachucanu.s. With the habit and the aspect 

 of E. subasper, but the herbage pale almost to hoariness with a 

 rather close investiture of harsh hairs inflexed from a pustulate 

 base : lowest leaves short-petioled and with oval-elliptic blades, 

 those of the stem rather large, many, partly overlapping each 

 other, spatulate-oblong and oblong-obtuse, sessile, narrower 

 ones extending even to the summit near the large head : bracts 

 of the involucre neither very narrow nor at all acuminate, 

 rather obtushish, strigose-hairy on the back ; rays many, either 

 white or very pale, of medium width between those of Erigeron 

 and Aster: achenes strigose-hairy, outer pappus of minute 

 subulate squamellae. 



Near Fort Huachuca, southern Arizona, T. E- Wilcox, 

 Sept., 1894. 



There is a very beautiful large broad-rayed asteraceous plant 

 very common in the mountains of Colorado, Wyoming, Mon- 

 tana and even far to the northwestward, one which might as 

 well be called an aster as an erigeron, which figures in our 

 herbaria, where there are hundreds of sheets of it, as Erigeron 

 salsuginosus ; meanwhile there is not in all the United States 

 any plant at all which answers or even comes near answering 

 to that plant of the high North, the ' ' salt plains of the Atha- 

 basca " described by Richardson in 1823 as Aster salsuginosus . 

 I now name and define our Rocky Mountain plant, according 

 to it the rank it long has called for. 



Erigeron cali^fanthemus. The stoutish stems commonly 

 1/^ feet high, often somewhat less, upright above an ascend- 

 ing base, sparsely leafy, often monocephalous, more com- 

 monly with one terminal head and a lateral one borne much 

 above the terminal : herbage thin and delicate, to all appear- 

 ance glabrous : basal leaves of narrowly elliptical blade 3 or 4 

 inches long and a petiole much shorter than that, or now and 

 then almost as long ; cauline leaves ovate and ovate-oblong or 



Lbaflbts, Vol. II, pp. 197-228. 11 April, 1912. 



