652 Rydberg : Rocky Mountain flora 



Oligoneuron canescens sp. no v. 



Solidago rigida humilis Porter Syn. Fl. Colo. 63, 1874. Not 

 S. humilis Mill. 



Stout perennial ; densely yellowish-canescent throughout ; stem 

 simple up to the inflorescence, 5-7 dm. high ; basal leaves long- 

 petioled ; blades oval, 7-12 cm. long, thick, canescent on both 

 sides, in age scabrous, distantly crenulate with small callous teeth ; 

 upper stem-leaves oval, sessile, entire or sinuate, crenulate, very 

 densely canescent ; inflorescence corymbiform but much congested ; 

 heads about 1 cm. high ; bracts oblong, striate, canescent ; rays 

 3-4 mm. long, less than 1 cm. wide, light yellow ; achenes slightly 

 hairy above, otherwise glabrous. 



This differs from 0. rigidum Small {Solidago rigida L.) in the 

 shorter leaves, the smaller and denser inflorescence, the dense 

 yellowish-canescent pubescence, and the achenes which are appar- 

 ently always slightly hairy above. It grows on prairies and in 

 valleys at an altitude of 900-1800 m. 



Wyoming: Buffalo, 1900, Tweedy 31 17 (type); Dayton, 

 1899, Tweedy 2017 ; Devil's Tower, 1899, L. W. Carter. 



Nebraska: Plummer Ford, Dismal River, 1892, Rydberg 

 1666. 



South Dakota: Custer, 1892, Rydberg 769. 



North Dakota : Tower, 1891, Wright. 



Chrysothamnus patens sp. nov. 



Shrubby, half a meter or so high ; stems white-tomentulose 

 when young, soon glabrous and yellowish green ; leaves 6-8 cm. 

 long, about I mm. broad, soon glabrous, spreading or even 

 reflexed ; bracts lanceolate, acute, carinate, glabrous, in 5 vertical 

 rows of about 3 each ; corolla-lobes about 1 mm. long, lanceolate, 

 acute, in age more or less spreading; achenes strigose. 



This is closely related to C. graveoleus, but differs in the nar- 

 row, spreading leaves. It grows on dry hills at an altitude o 

 1 300-2 1 00 m. 



Colorado: 1873, Wolf 452 (type); Grand Junction, 1901, 

 Underwood & Selby 498b; 1900, Stokes; Manitou, 1900, 

 Clements; Alamosa, 1896, Shear 3753 ; Zola, 1901, Baker 668. 



Chrysothamnus Newberryi sp. nov. 

 Shrubby below ; stem white-tomentose, rather slender ; leaves 

 erect, linear-filiform, i-nerved, slightly tomentulose when young; 



