106 
for P. erectum L., from which it differs chiefly in its reduced and bract-like 
upper leaves. 
P. tenue Michx., reported only from Tippecanoe County and Lake 
County. is in much the same case. It is probable that in most instances 
it has been mistaken for P. aviculare L., which it closely resembles in 
habit of growth and general aspect. Since recognizing it in Tippecanoe 
County I have been greatly surprised to find how abundantly it occurs. 
It would be well to examine herbarium specimens with some care for 
these two forms. 
Generally speaking, the species of this genus can not be satisfactorily 
distinguished unless collected in fruit, a fact which seems to have been 
lost sight of in most of the herbarium sheets which have come to my 
notice. 
GERANIACEZ. 
In this family, as at present limited, there are but the two genera 
Geranium and Brodium. 
So far as I am able to determine the only species of geranium within 
our bounds are G. Carolinianum L. and G. maculatum L. Both seem of 
general distribution, although perhaps maculatum extends farther north 
and is everywhere much more abundant. 
G. Robertianum 1... reported from Dearborn County, by Dr. Collins, is 
probably Carolinianum. There is no apparent reason why G. Robertianum 
should not occur within the State, but as yet I have failed to find it in 
any collection. Several unpublished lists that have come into my hands 
have included G. dissectum lL. The plants so referred are in every case 
depauperate forms of G. Carolinianum IL. 
Prodium cicutarium (.) L’Her. is reported only from Gibson and Posey 
counties, by Dr. Schneck. It is to my mind very improbable that this 
rather rare, adventive plant, reported only from New York and Pennsyl- 
vania. should have found lodgement in these counties as a permanent 
member of our flora. Dr. Schneck preserved no specimens, but doubtful 
forms were passed upon by Dr. Gray. In my opinion the plant is not a 
member of the State flora, its admission in all probability being based 
upon a temporary escape. Unless additional data are at hand it will be 
dropped from the State list. 
