PRELIMINARY REVISION OF THE NORTH AMER- 
ICAN SPECIES OF CHRYSOSPLENIUM.? 
J. N. ROSE. 
Four species of Chrysosplenium are here recognized as 
belonging to North America. One of these, although it has 
been long represented in our larger herbaria, has never before 
been published; another (C. tetrandrum) has been considered 
a variety of C. alternifolium by recent monographers. After the 
examination of much material I have been forced to restore it 
to specific rank. The name C. glechomaefolium of Nuttall must 
give place to the older varietal name Scouleri of Hooker. 
The genus is naturally separated into two groups by the 
leaves, one having them opposite and the other alternate. In 
America we have two species in each group; of the opposite- 
leaved group one species is western and one eastern ; of the alter- 
nate leaved group one species is known only from the Pribilof 
islands, while the other is high northern, but extends in the 
Rocky mountains as far south’as Colorado, with an isolated form 
or variety in lowa. 
Although not found in America, C. alternifolium is included 
in the subjoined key on account of its confusion with C. fetran- 
* Leaves all alternate. 
+ Rootstock wanting: stolons slender: flowers yellow: disk 
Hoe inconspicuous or wanting: seeds many. 
++ Stamens 8: leaves large, dull, veined, thin, spotted. 
CHRYSOSPLENIUM ALTERNIFOLIUM L. Sp. 1: 398. 1753- 
Stems 5 to sO high, I to 3-leaved: leaves thin, veined; 
_fadical leaves reniform, cordate at base, the sinus often closed, 
- * Published by permission of the — Assistant Secretary, Smithsonian Institu- 
ton, in change ofthe U5. National Ms 
oe 
ng . [APRIL 
