10 BOTANICAL GAZETTE [juLy 
not wanting, but they are not as easy of application as those 
drawn from the prickles. The form of the leaflets, perhaps, may 
be usefully employed. In &. Nutkana the leaflets are oval, more 
or less rounded at base, with teeth rather open; while those of 
R. blanda are obovate, relatively narrower, more or less attenuate 
at base, with teeth turned towards the apex. It can be added 
that the former frequently has glandular-compound teeth, while 
the latter almost always has simple ones. To judge well the 
differences I have described it is necessary to compare quite an 
amount of material of the two species, for fear of being deceived 
by certain variations of form. 
The inflorescence can also be used for a distinction, but should 
be used only with sufficient material for accurate judgment. 
The inflorescences of R. Nutkana are much more often one-flow- 
ered than are those of R. dlanda. The statistics which I have 
obtained concerning the inflorescences give the following pro- — 
portions between the one-flowered and many-flowered inflores- 
cences: for R. nutkana, 1.8:1; for R. blanda, 1: Lae 
The corolla is notably larger in R. Nutkana, and the fruc- 
tiferous receptacles and akenes are a little larger. The tissue of 
the fructiferous receptacle at complete maturity is drier and less 
pulpy than in R. dlanda. 1 wish to remark, in passing, that the 
size of the akenes, from which Mr. Best has obtained the means 
of distinguishing R. Carolina from R. humilis, deserves the atten- 
tion of American botanists. In the section CinnaMoME2 it will 
be found probably that the size of the akenes may be usefully 
employed as a distinguishing character, 
The upper stipules and bracts are habitually much more 
dilated in R. Nutkana than in R. blanda. 
All of these last characters, resting simply upon a difference a 
in size, certainly are of importance, but unfortunately they very 
often weary the perplexed observer who cannot compare a suf- 
ficient amount of well chosen material. 
R. pisocarpa and R. Californica have paired prickles, as in A. | 
Nuthkana. In the former, these prickles, which are straight, are 
© Cf. Remarques sur l’inflorescence des Rosa in Bull. Soc. bot. Belg. 347: —: 1895- 
