80 Statistics of the Flora of the Northern States. 
the regions of identical and of allied species on either side, an nd 
which 1 may or may not be reckoned specifically the same, accord- 
ing to our varying knowledge, and according to the views which 
different authors take respecting species. A good ane of the 
subjects of comparison might perhaps be made into 
1. Geographical Varieties, or those cases in n which the Ameri- 
can S yaa is always or generally distinguishable from the Euro- 
pean in some point or other, and is not unlikely to be reckoned 
Tents a even by sound botanists. 
2. Very Close Representative Species, admitted as distinct, but 
not ae many of them to be reduced to geographical vari- 
eties. 
3. Strictly Representative Species, pretty exactl anew ering to 
each other in athe tw floras, ‘but ot hi eh thats Gan be little if 
any question of specific identi 
tity. 
4, Strictly _ Species, but not falling into either of the 
former categori 
5. Divergent Congtheric Species, where the American type be- 
longs to a different section or subgenus from the European 
To which these = poe ~~ added, 6th, species of strictly analo- 
us or representative 
I must not attempt hele: anything beyond an enumeration, 
made currente calamo, of such examples in question as occur 
me under the first three heads : 
1, American Geographical Varieties, which not only have been, but a: 
not unlikely to be again distinguished as Species, and i to a 
merged in No. 2 
Ranunculus repens, Amer.: formerly R. Marilandicus, &e. 
Actzea spicata, vars. alba and rubra: 
Nasturtium palustre, fructu brevi: N. no ars &e. 
Ribes rubrum, Amer. : R. albinervi 
Solidago virgaurea, Amer., vars. : S. humilis nik ‘multiradiata. 
Monotropa Hypopitys, Amer. : M. lanuginosa. 
Statice Limonium, var. : S. Caroliniana, 
Samolus Valerandi, var. Amer.: S. floribun 
Lycopus na te var. sinuatus : L. sinuatus. 
ys palustris, v S. aspera, glabra, cordata, ‘ke. 
yosotis palustris, beh pore M. lax 
Castanea vesea, var. Americana: C. Americana. 
Betula alba, var. populifolia: B. populifolia. 
Taxus baccata, var. Canadensis : T. Canadensis. 
Trisetum 
, var. molle: T. molle. 
