RYDBERG: Rocky MOUNTAIN FLORA 147 
CORNELLA Rydb. gen. nov. 
The type of the genus Cornus L. is C. mas L. which has no 
congener in this country, except perhaps C. sesszis Torr. of Cali- 
fornia. Opiz segregated from Cornus the genus Svida, to which 
the European C. sanguinea and most of our American cornels 
belong. Rafinesque in his Alsographia Americana made the 
genus Gynoxylon based on C. florida L., and also another genus 
(or subgenus) Zvkrania in which he placed C. canadensis L. and 
C. suecica L. Unfortunately he made C. mascula 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. Nuttaéli 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 Cornus. 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. 
Cornella canadensis (L.) Rydb. 
Cornus canadensis L. Sp. Pl. 118. 1753. 
Cornella suecica (L.) Rydb. 
Cornus suecica L. Sp. Pl. 118. 1753. 
Cornella unalaschkensis (Ledeb.) Rydb. 
Cornus unalaschkensis Ledeb. Fl. Ross. 2: 378. 1844. 
Pseudocymopterus multifidus Rydb. 
Pseudocymopterus 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. 
Pseudocymopterus tenuifolius (A. Gray) Rydb. 
Thaspium montanum tenuifolium A. Gray, Pl. Wright. 2: 65- 
ar re 
