Rydberg.: Studies on the Rocky Mountain flora 15 



narrow leaves (narrower than in H. canadense) has sometimes 

 been confounded with H. umbellatum, sometimes with 77. cana- 

 dense on account of its hairy stem. The common plant of the 

 West, which has been confounded with both, is H. scabri it senium 

 Schwein.* (H. macranthum Nutt.f). Narrower-leaved specimens 

 have been named H. umbellatum and broader-leaved ones, H. 

 canadense. It differs from H. canadense in the glabrous stem 

 and finely scabrous-puberulent leaves. H. cohimbianum has long 

 white or yellow hairs on the lower part of the stem. 



The true Hieracium Scoulcri Hook, is not found in the region. 

 A duplicate of the type is in the old Torrey herbarium. It is an 

 almost scapose plant with the broad leaves obtuse at the apex 

 and gathered near the base of the stem. The stem-leaves are 

 few and small and the involucral bracts hirsute with short dark 

 hairs. The plant resembles more Hieracium albifloriim in habit 

 than it does H. griseum and H. cynoglossoides. The plant with 

 long-hairy involucre which, mainly, Dr. Gray described in his 

 Synoptical Flora and Professor Nelson described in the New 

 Manual is not H. Scoideri. It should be known as H. albertianum 

 Farr.J 



Heteropleura Fendleri (Schultz Bip.) Rydb. comb. nov. 



Crepis ambigua A. Gray, Mem. Am. Acad. 4: 114. 1849. Not 



C. ambigna Balb. 1805. 

 Hieracium Fendleri Schultz Bip. Bonplandiap: 173. 1861. 

 Heteropleura ambigua Schultz Bip. Flora 45: 435. 1862. 

 Hieracium nigrocollinum S. Wats. Proc. Am. Acad. 25: 133. 



1890. 



This species has been included in Hieracium by Dr. Gray and 

 others. It would be better to include it in Crepis than in Hiera- 

 cium, for the achenes are tapering upwards and the pappus is 

 tawny, not white. The involucral bracts are not thickened on 

 the back, however, as they are in most species of Crepis, and the 

 general habit resembles perhaps more that of Hieracium than of 

 Crepis. It does not fit well in either genus, at the same time 



* Long's Second Exp. 2: 394. 1824. 



t Trans. Am. Phil. Soc. II. 7: 446. 1841. 



J Ottawa Nat. 20: 109. 1906. 



