ADDITIONAL LIST. 463 
instance. And he will always be reminded of the more inclusive 
aggregate to which others refer the segregate plant, through the 
middle name so interposed. It should be mentioned, however, 
that the abbreviated authority given with the distinctive name has 
been often accepted here along with the name, without other more 
special verification; and it may mean either a variety or a species 
in the views of the Author cited. A general reference may be 
given here to the Third Edition of English Botany for explana- 
tions more special and complete. 
A further circumstance should be noted. In some cases it will 
be necessary to notice all the segregate forms which go to make 
up the total aggregate, as treated in the Synopsis. Such will be 
the case when the distribution of the aggregate, as before set 
forth, will too uncertainly represent that of any one of the 
segregates by itself. Thus, according to present knowledge, the 
formulary distribution of Thalictrum minus, as given for the 
aggregate on page 79, would not be correct for any one of its 
five segregates. The same must be held true for the present, 
if not permanently so, in regard to the three segregates of 
Thalictrum flavum; the distribution of which, apart from each 
other, is yet almost entirely unascertained. And in the couplets 
of species shortly above quoted, we may find instances where the 
indicated distribution of the aggregate would perhaps less well 
represent that of the segregate retaining the like name, as its 
typical form, than it would represent that of the segregate named 
as a second or aberrant one. Certainty is not attained; but it 
seems likely on present knowledge, that Polygala eu-vulgaris is 
less general than P. depressa, and that Epilobium eu-tetragonum 
is less general than E. obscurum. If so, the formula filled in for 
the aggregate certainly over-states the distribution of the type 
form, while it may or may not over-state that of the segregate; 
a question to be answered only on further and more complete 
knowledge about their respective localities. 
In other cases the segregate is so rare or local that its severance 
from the aggregate makes no difference in the stated distribution. 
Thus, Caltha radicans being known only from one or two of the 
