46 
change of a well-known and established name, especially with re- 
spect to species not too well defined. Provisionally, therefore, A. 
campylocarpa may be retained as a synonym of the later, but better 
founded A. magnifica. 
Canella alba, Murray, (in Linn. Systema Veg. ed. 14, iv. 443, 
1784.) 
Linneus’ Laurus Winterana (Spec. Pl. ed. 1, 371, 1753, exclu- 
sive “ Hab. in Carolina”) is the oldest name applied to this semi- 
tropical Florida and West Indian tree. Gaertner (Fruct. i. 377, t 
77, 1788) took up Linnaeus’ specific name Winterana under Canella, 
but was not followed by subsequent authors. It is evident, how- 
ever, that Gaertner’s Canella Winterana should be maintained. 
Linnaeus’ Winterania Canella (Spec. Pl. ed. 2, 636, 1763) is also 
an older name than Murray’s C. aléa, which if taken up would 
give (Canella Canella) a combination, though that fortunately can | 
now be avoided. 
ForRESTRY DIVISION, 
U. S. DEPARTMENT OF AGRICULTURE, 
WASHINGTON, D., C. 
On the American Black Cottonwood,* 
By P. A. RYDBERG. 
(PLaTEs CXL. anD CXLI.) 
“372. Fopuus 3p... +... ; Wiest approaching the Carter 
Canon, in Scott’s Bluff County, I saw, at a distance, some dark 
green trees with pyramidal crowns. Not knowing any other tree 
with dark foliage and pointed top growing in the region, I took 
them for unusually tall specimens of Juniperus Virginiana. Coming: 
a little nearer, I saw my mistake. It was a Populus, unlike all I 
have seen. As the buds were very balsamiferous and the leaves” 
cuneate at the base, I thought it was nothing but P. angustifolia, 
which I have never seen growing. When at home, I compared it 
with my specimens of this poplar, collected by Mr. T. A. Williams 
in the Hat Creek Basin in North-western Nebraska, and I saw at 
once the difference between the two. Although the leaves of my 
*Read before the Botanical Seminar of the University of Nebraska. 
