Osterhout : New Plants from Colorado 645 



^ Artemisia silvicola 



Perennial from creeping rootstocks, 4-6 dm. high, sparingly 

 branched and loosely paniculate, the stems slender, finely pubescent, 

 leafy to near the top with comparatively few leaves ; the leaves 

 linear, 4-6 cm. long, the wider 5-8 dm. wide, all entire or with 

 few sharp teeth, acuminate and tapering to the sessile base, almost 

 dabrate and green above, silvery canescent beneath with a close 

 tomentum : inflorescence loosely paniculate, 2-3 dm. long, the 

 heads scattered — i. c. y not dense — on the branches of the panicle, 

 5 mm. high and about the same in width, of about 10-12 marginal 

 flowers and the same number of central ones, the corollas of the 

 latter purple ; the involucral bracts oblong, slightly tomentose. 



Found along mountain streams at an elevation of 6000 to 



8000 feet. The type specimens were collected along Maclntyre 



Creek, a branch of the Laramie river, in Larimer county, Colo., 



Vug. 24, 1900, no. 2242. A species belonging to Euartemisia. 



It is an ally of Artemisia Mexicana Willd. and distinguished by its 



fewer and larger leaves, the more lax inflorescence and larger 



heads. 



* Agoseris agrestis 



A scapous perennial, glabrous and glaucous, especially the 

 leaves ; the stems usually single from the root, stout, erect, 2-4 

 dm. high : leaves numerous, from linear to oblong on the same 

 plant narrowed to a petiole, and either entire, sparingly sinuate, 

 dentate at the middle or some of the larger cleft at the middle, the 

 divisions pointing upward, the larger 10-15 cm. long, acumi- 

 mate : the involucral bracts finely pubescent, in three series succes- 

 sively longer, oblong, acuminate, about 2 cm. long : the flowers 

 yellow (purple in drying) : the ribbed achenes 1 2 mm. long, in- 

 cluding the stout beak of nearly half this length ; the pappus 

 copious and very white. 



A plant of the meadow lands of the mountains. The type 

 specimens were collected in Estes Park, Larimer county, Colo., 

 July 20, 1900, no. 221 5. Collected also by Prof. Aven Nelson at 

 Willow Creek, Albany county, Wyo., no. 3572. This species is 

 readily distinguished from Agoseris glauca (Pursh) Greene by the 

 wider leaves, the stout upright scape and the larger heads. 



