58 BOTANICAL GAZETTE [JULY 
without either of the authors being aware of the existence of a Schzzo- 
notus Raf. 
In /ndex Kewensis the Schizonotus of Lindley and of Rafinesque 
are not discriminated, but wrongly united under Schizonotus Lindl.; 
while Schizonotus Gray is enumerated as valid. Also the Zhecanisia 
discolor Raf. is there erroneously made a synonym of Spiraea discolor, 
but it is an herbaceous plant allied to U/maria rubra, and probably 
based on escaped plants of the European UW. pentapetala Gilib. (Spiraea 
Ulmaria Linn.) 
It will be clear that on account of priority as well as of usage the 
name Sorbaria ought to be considered as the valid name, with Schzzo- 
notus Lindl. (1830) and Baszlima Raf. (1836) as synonyms; while 
Holodiscus (Koch) Maxim. should be substituted for Schizonotus Rat., 
at least by those who follow the Rochester rules in accordance with 
article IV, and by others on account of expediency, to avoid all pos- 
sible confusion with the other two genera, of which one is liable to be 
revived under certain rules of nomenclature. 
Sorbaria of course will not enter into the American flora if Chamae- 
batiaria is considered as constituting a distinct genus, which it may 
be, though structural differences in flower and fruit are hardly pres- 
ent. In foliage and habit, however, it is strikingly different. The 
observation of Rafinesque that Sordaria sorbifolia is a native of North- 
west America seems not to be based upon any reliable source, at least 
it has not been found again on American soil, neither has S. grandi- 
flora Maxim. (Basilima pygmaea Raf.), which was suspected by him to 
occur probably somewhere in the same region.—ALFRED REHDER, 
Arnold Arboretum. 
POTAMOGETON POLYGONIFOLIUS IN NEWFOUNDLAND. 
THE only note of the occurrence of this species in North America 
I know of is contained in Linnaea 2: 216. 1827; where Chamisso has 
the following: ‘Hujus loci forsitan est: Potamogeton de St. Pierre 
Miquelon prés Terreneuve in Herb. Brogniart, sed major.” I have 
not seen the specimens in Brogniart’s herbarium, which is at Paris. 
In the Journal of Botany for June of this year, I record it from 
Sable island, about 100 miles off the coast of Nova Scotia. I have 
now to record it from Newfoundland, from whence I find specimens 
the Kew herbarium from the herbarium of Harvard University. 
