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. rosiilata 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). 



t^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 i^v^ ; 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, petiolaris^ which it re- 

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

 nate in the manner of //. 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, Umbach 261. 



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



Colorado: Manitou, 1901, Clements 8 (mixed with H. peti- 

 'Olaris) . 



Nebraska: Kimball, iZg\, Rydberg- 184. 



'/Tetraneuris Crandallii sp. nov. 



Cespitose, acaulescent perennial ; leaves narrowly hnear-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 p:labrate leaves, and from the latter in 



the narrow bracts and larger rays. 



