152 Rvdberg : Rocky Mountain flora 



v Galium subbiflorum (Wieg.) Rydb. 



Galium trifidiun subbiflorum Wieg. Bull. Torrey Club 24 : 399 



1897. 



Distegia involucrata (Richardson) Rydb. 



Xylostcum involucrattim Richardson, Frankl. Journey 733. 1823 

 Lonicera involucratum Banks; Spreng. Syst. I : 759. 1825. 

 Distegia nutans Raf. New Fl. Am. 3: 21. 1836. 



' Chrysothamnus serrulatus (Torr.) Rydb. 



Linosyris serrulata Torr. ; Stansbury, Expl. 389. 1852. 

 Chrysothamnus glaucus A. Nelson, Bull. Torrey Club 25: 377. 

 1898. 



y Chrysothamnus latifolius (D. C. Eaton) Rydb. 



Linosyris viscidiflora latifolia D. C. Eaton, Bot. King Exp. 157. 

 1871. 



Bigelovia Douglasii latifolia A. Grav, Proc. Am. Acad. 8: 646. 



1873. 



Isocoma Wrightii (A. Gray) Rydb. 



Linosyris Wrightii A. Gray, PI. Wright. 1 : 95. 1852. 

 Bigelovia Wrightii A. Gray, Proc. Am. Acad. 8: 639. 1873. 



OREOCHRYSUM Rydb. gen. nov. 



Plants with slender horizontal rootstock, leafy, viscid-puberu- 

 lent above. Involucral bracts oblong, pale, rather obscurely I- 

 ribbed, chartaceous or the outer foliaceous, in about three moder- 

 ately unequal ranks. Rays several, short. Disc-corollas narrowly 

 trumpet-shaped, deeply 5-toothed. Style-appendages lanceolate, 

 longer than the stigmatic portion. Achenes angled. Pappus white 

 or slightly tawny, of soft scabrous bristles. 



When Dr. Greene made his segregations of the old genus 

 Aplopappus, he transferred the type of the genus here proposed to 

 Solidago, but it is just as much out of place here as among its old 

 associations, i e. t the present genus Stcnotus. It is true that in 

 general habit it reminds one of a group of species formerly included 

 in Soluiago, but now segregated as a genus Oligoucurcn Small ; 

 the character of the involucre and the style-appendages, however, 

 distinguish it from Oligoneuron as well as from Solidago proper. 



