152 Rydberg : Rocky Mountain flora 



Galium subbiflorum (Wieg.) Rydb. 

 Galimn trifiduni subbiflorum Wieg. Bull. Torrey Club 24 : 399. 

 1897. 



Distegia involucrata (Richardson) Rydb. 

 Xylostcuui invohucratuin Richardson, Frankl. Journey 733. 1823. 

 Loiiiccra invohicratuiiiV>-A\\\cs\ Spreng. Syst. i: 759. 1825. 

 DistCi^ia nutans Raf. New Fl. Am. 3: 21. 1836. 



Chrysothamnus serrulatus (Torr.) Rydb. 



Linosyris scrrulata ^o\x.\ Stansbury, Expl. 389. 1852. 

 Chrysotliauiuus g'aucus A. Nelson, Bull. Torrey Club 25: 377. 

 1898. 



Chrysothamnus latifolius (D. C. Eaton) Rydb. 

 Linosyris viscidiflora lat{foliii D. C. Eaton, Bot. King Exp. 157. 



1871. 

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



1873- 



Isocoma Wrightii (A. Gray) Rydb. 



Linosyris Wrightii A. Gray, PI. Wright, i: 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 seg'-egations 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, /. e., the present genus Stcnotus. It is true that in 

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

 in Solidago, but now segregated as a genus Oligoncurcn Small ; 

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

 distinguish it from Oligoncuron as well as from Solidogo proper. 



