402 



MEMOIRS OF THE NE^V YORK BOTANICAL GARDEN. 



Erigeron multifidus ; Erigeron comfosittis Hook. Fl. Bor. Am. 2: 



17. 1834 [Syn. Fl. I": 211, mainly; Man. R. M. 170]; not 



Pursh, 1814. 



This is the common form of the Rocky Mountains known as E. 

 conipositus, but differs considerably from Pursh's plant. In the 

 latter the leaves are about 5 cm. long, thrice divided into linear 

 lobes, and only hirsute on the petioles, while in E. miiltifdiis they are 

 mostly twice ternale, with short oblong or spatulate lobes and are 

 generall}^ hirsute all over. E. compositus has larger heads, over i 

 cm. high and often 1.5 cm. in diameter, with subequal and appressed 

 bracts, while in E. ?nulttfidus the heads are 6-8 mm. high and about 

 I cm. in diameter and the outer bracts shorter and often spreading 

 in age. Of E. coinpositits there is only one specimen in the Colum- 

 bia University collection and one in that of the New York Botanical 

 Garden. The former was collected at Pursh's type locality, near 

 Lewiston, Idaho, bv Heller, 1896,^0/7; the other by A. Nelson in 

 Wyoming. 



On high dry ridges, at an altitude of 1500-3000 m. 



Montana: Flathead River, Wycth; Hell Gate, John Pearsall^ 

 826 and ^57; Beaver Head Co., 1888, Tzvccciy, 2j^; Deer Lodge, 

 1888,/^. W. Traphagcu; Silver Bow Co., Mrs. Jennie II. Moore; 

 Mill Creek, 1887, Tweedy, 374: Bridger Mts., June 15, 1897, 

 Rydberg & Bessey, 3o8g; Spanish Basin, June 26,50^0,' Crooked 

 Falls, 1888, 7?. S. Williams, 222; Head of Stillwater, 1897, P. 

 Koch,yj; Shields River, 1883, Scribncr, loic: Bozeman, loib. 



Yellowstone Park: 1888, Dr. C/ias. II. Hall; 1885, Tzceedy, 

 J08 and yog; Hoodoo Peak, 1897, P. Koch, 8. 



Idaho: Mt. Chauvet, Julv 29, 1897, Rxdberg S: Bessey, jo88. 

 Erigeron multifidus discoideus (Gray) ; Erigeron compositus dis- 



coideus Gray, Am. Journ. Sci. (II.) 33: 237 [Syn. Fl. i" : 211; 



Man. R. M. 170]. 



On dry ridges, at an altitude of 2000-3000 m. 



Montana: Gallatin Co., 1888, Tzveedy, 2jj; Cedar Mts., July 

 16, 1897, Rydberg& Bessey, jogi. 



Yellowstone Park : 1888, Dr. Chas. H. Hall • Electric Peak, 

 Aug. 18, 1897, Rydbcrg & Bessey, 30^2. 

 * Erigeron multifidus nudus ; Erigeron compositus glabratus Ma- 



coun, Cat. Can. PI. 231, 1884; not E. glabratus Hook. 1834. 



Resembles the species, but is not hirsute, except a few hairs on 



