MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 419 



Montana: Helena, 1888, and 1892, F. D. Kelsey ; Lewis and 

 Clarke Co., Airs. Math; Centerville, 1883, Scribner, loyb. 

 Yellowstone Park: 1888, Dr. Chas. H. Hall. 



Helianthus petiolaris Nutt. Journ. Acad. Sci. Phila 2 : 115 [111. 



r"l. 3 : 423 ; Syn. Fl. i- : 272 ; Bot. Cal. i : 353 ; Man. R. M. 186] . 



Dry prairies and waste places, up to an altitude of 1500 m. 



Montana : John Pearsall, 813 ; Belt River, 1881, 7?. S. Williams, 

 162; Gallatin Cit}', 1883, Scribner, loya, 



* Helianthus subrhomboideus. 



Perennial ; stem 3-6 dm. high, terete, striate, tinged with red, 

 sparingly hirsute, simple ; leaves opposite, firm, very scabrous, triple- 

 veined, generally not strongly serrate, the basal broadly ovate 

 or obovate-spatulate ; stem-leaves rhomboid-ovate or rhomboid-lanceo- 

 late, short-petioled, 5-10 cm. long, the uppermost diminutive, lanceo- 

 late ; heads mostly solitar}^ sometimes 2 or 3, 1-1.2 cm. high and 

 1.5—2 cm. in diameter; bracts in 4—5 rows, oblong, acutish, densely 

 white-ciliate on the margins ; disk dark brown or purplish ; rays 

 about 1.5 cm. long. 



Nearest related to H. scaberrimtis, but differs in the broader and 

 shorter leaves, the less acute bracts, the smaller heads, and generally 

 longer peduncles. It grows on prairies, up to an altitude of about 

 1000 m. 



Montana: Sand Coulee, 1885, R. S. Williams, 24^; Columbia 

 Falls, i^/r5. Kennedy, 6 ;]\xd\\h Mts., 1882,7?. W. Springer, XXXV. 



Nebraska : Keya Paha River, 1893, Clements, 2866 ; Long Pine, 

 1890, G. D. Szveezey, yo; Whitman, 1893, Rydberg, 162 j (type). 



Dakota: Mouth of Big Sioux River, 1853, Hayden Survey; 

 Upper Missouri, Nicollet; Custer, 1892, Rydberg, 80^. 



Assiniboia : Cypress Hills, 1880, John Macotm ; Souris Plains, 

 1883, /. M. Macoiin. 



Saskatchewan: 1857-8, E. Bourgeau. 



* Helianthus giganteus L. Sp. PI. 905 [Syn. Fl. i^ 276; 111. Fl. 3: 



425]- 



Like H. Nnttallii, but with broader more strongly serrate leaves, 



more numerous heads, and broader bracts which are strongly hirsute. 



The specimen cited below differs somewhat from the eastern form 



in that the rays are much longer, the heads larger, and the bracts 



broader and shorter. A similar specimen was collected by Macoun 



near Banff, Alberta, in 1891. 



Montana: Smith River, 1883, Scribner, loy. 



