512 Rydberg : Studies on the Rocky Mountain Flora 



Taraxacum Alaskanum sp. nov. 



A low delicate plant with perennial root : leaves linear-oblan- 

 ceolate in outline, 3-5 cm. long, deeply runcinate-pinnatifid with 

 triangular retrorse lobes : scape 4-5 cm. high : involucre cam- 

 panuate, 10-12 mm. high, 6-8 mm. broad: bracts fuscous, not 

 corniculate ; the inner linear-lanceolate, long-acuminate ; the outer 

 scarcely half as long, lanceolate, spreading or somewhat reflexed : 

 achenes brownish, spinulose-muricate above, fusiform, 4 mm. long. 



This in size and habit most resembles T. scopidomm, but is 

 easily distinguished by its triangular acute lobes. It was found 

 " on steep side bank facing the ocean." 



Alaska : Pt. Barrow, 1 898, McIUicnny. 



Crepis glaucella sp. nov. 



Perennial with a slender tap-root. Stem slender, about 3 dm. 

 high, glabrous and shining : basal leaves glabrous and shining, 

 somewhat glaucous, thin, 5-10 cm. long; blades oblanceolate, 

 acute at the apex, tapering downward into a more or less winged 

 petiole, remotely sinuate-dentate with divaricate or retrorse short 

 teeth or entire ; stem-leaves 1-2, much reduced, 1-2 cm. long, 

 linear or nearly so : heads 1-4, on slender branches : involucre 

 turbinate, about i cm. high and 6-8 mm. wide, sparingly hirsute ; 

 bracts linear-lanceolate, acuminate : achenes brown, lo-striate, gla- 

 brous : pappus white. 



This species is nearest related to C. glaiica but differs in the 

 smaller, narrower, longer-petioled leaves and hirsute involucre. 



Wyoming: Pacific Creek, 1897, F. Tweedy, 6oj. 



HiERACiUM MACRANTHUM Nutt. Trans. Am. Phil. Soc. II. 7 : 446. 



1840 



Hicj'aciiini iniibellatwii Hook. Fl. Bor. Am. I : 300, in part ; 

 Rydb. Mem. N. Y. Bot. Garden i : 463, mainly. Not L. 



The plant of the Rocky Mountain region which has been re- 

 ferred to H. iimbcllatwn and sometimes to H. Canadeiuc is quite 

 distinct from both. The leaves are usually broader than in the 

 first but narrower than in the second and the heads are usually 

 fewer than in either. The best character by which to distinguish 

 it is, however, the pubescence. The leaves are densely puberu- 

 lent and decidedly scabrous-ciliolate on the margins. The upper 

 portion of the stem and the branches of the inflorescence are also 

 scabrous puberulent. 



