Rvdberg : Rocky Mountain flora 147 



CORNELLA Rydb. gen. nov. 



The type of the genus Cormis L. is C mas L. which has no 

 congener in this country, except perhaps C. sessilis Torn of Cali- 

 fornia. Opiz segregated from Cormis the genus Svida, to which 

 the European C. sanguined and most of our American cornels 

 belong. Rafinesque in his Alsographia Americana made the 

 genus Cynoxylon based on C.florida L., and also another genus 

 (or subgenus) Eukrania in which he placed C. canadensis L. and 

 C. suecica L. Unfortunately he made C. mascida of Europe, 

 which is congeneric with and some claim the same as C. mas L., 

 the type, and C. canadensis and C suecica have no available generic 

 name, unless they are included with C.florida and C. Nuttallii in 

 Cynoxylon, Outside of the great difference in habit and fruit be- 

 tween the Dwarf Cornels and the Flowering Dogwoods, the former 

 have one character not found in any of the groups usually included 

 in Cormis. The sepals of the Dwarf Cornels have a small horn- 

 like, at last deciduous, spine on the back near the apex. This, 

 together with the peculiar habit, makes them deserve generic rank. 



i Cornelia canadensis (L.) Rydb 



Cor nits canadensis L. Sp. PI. 118. 1753. 



4 Cornelia suecica (L.) Rydb 



Comus suecica L. Sp. PI. 118. 1753. 



v Cornelia unalaschkensis (Ledeb.) Rydb. 



Comus unalaschkensis Ledeb. Fl. Ross. 2 : 378. 1844 



* Pseudocymopterus multifidus Rydb. 



Psetidocymoptents montanus multifidus Rydb. Bull. Torrey Club 

 31: 574. 1904. 



'Pseudocymopterus purpureus (C. & R.) Rydb. 



Pseudocymopterus montanus purpureus C. & R. Rev. N. Am 

 Umbell. 75. 1888. 



4 



Pseudocymopterus tenuifolius (A. Gray) Rydb. 



Thaspium montanum tenui folium A. Gray, PL Wright. 2 : 65 

 1853. 



