Rydberg : Rocky Mountain flora 127 



Antennaria Sierrae-Blancae sp. nov. 



Depressed perennial, pulvinate-cespitose, rosulate, almost stem- 

 less ; leaves broadly spatulate, less than I cm. long, abruptly- 

 acute, white-floccose beneath, glabrate above ; heads subsessile in 

 the rosettes, 6—j mm. in diameter ; bracts broadly oblong to al- 

 most obovate, with a scarious brown upper portion. 



Closely resembling A. rosulata in habit, it differs however in 

 the smaller heads, brown bracts and leaves that are glabrate above. 

 It grows at an altitude of 3600-4000 m. 



Colorado : Sierra Blanca, 1877, Hooker & Gray (type in 

 Gray herbarium). 



Helianthus aridus sp. nov. 



Annual ; stem 3—8 dm. high, more or less hispid ; leaves all 

 petioled, the lower opposite, the upper usually alternate ; blades 

 lanceolate, 4-7 cm. long, entire or crenate, acute, hispid-scabrous 

 on both sides ; heads rather few ; bracts ovate, abruptly acumi- 

 nate, hispid on the back and hispid-ciliate on the margins ; disk 

 1.5-2 cm. wide, purplish; rays oblong to oval, 15-20 mm. long, 

 6-8 mm. wide ; achenes cuneate, almost black, finely strigose, 

 about 5 mm. long and 2 mm. wide. 



This species has been mistaken for H. petio/aris, which it re- 

 sembles most, but the bracts are hispid-ciliate and strongly acumi- 

 nate in the manner of H. lenticularis. H. aridus grows in dry 

 ground, especially in old fields and waste places. 



Montana : Great Falls, 1885, F. IV. Anderson (type) ; Poison, 

 1 90 1, Umbacli 261. 



Wyoming: Gros Ventre Mountains, 1900, C C Curtis. 



Colorado: Manitou, 1901, Clements S (mixed with H. peti- 

 vlaris). 



Nebraska: Kimball, 1891 , Rydberg 184. 



Tetraneuris Crandallii sp. nov. 



Cespitose, acaulescent perennial ; leaves narrowly linear-oblan- 

 ceolate, conspicuously white-woolly at the base, 4—6 cm. long, 2— 

 3 mm. wide, sparingly long-hairy, soon glabrate ; scape 1-3 dm. 

 long, sparingly strigose ; involucre hemispherical ; bracts about 8 

 mm. long, linear-oblong, silky-villous, but hairs rather appressed ; 

 rays about 15 mm. long, 5—8 mm. wide, 3— lobed, 4— 5-nerved. 



This species is related to T. arizonica and T. pilosa, but differs 

 from the first in the narrow glabrate leaves, and from the latter in 

 the narrow bracts and larger rays. 



