106 THE FLORA OF THE AMBOY CLAYS. 
and it may be that they and C. robustum Newb. should all be considered as 
varieties of one species. It was, however, the evident intention of Dr. 
Newberry to keep them separated, and hence they are so retained. 
Dr. Newberry left no memoranda in connection with these specimens, 
and I have named the species in honor of Dr. N. L. Britton, of Columbia 
College.—A. H. 
Order ACERACEZ. 
ACER AMBOYENSE Newb. n. sp. 
Pl. XLVI, figs. 5-8. 
Leaves unknown; samaree 15™" to 25™" in length and 8™™ to 10" in 
width; the wing is broad, rounded, membranous, and veined. 
These seeds of a species of maple are quite unmistakable, and a num- 
ber of them have been found in the Amboy Clays; but up to the present 
time we have no leaves that in any way correspond to those of Acer or 
Negundo. The samarz are about the form and size of those of the red 
maple (Acer rubrum), but the wing is rather broader. 
We find in the colleetion a few samarz which are different from the 
usual form. One of these is represented by fig. 5, in which the wing is 
nearly straight. This, I have fancied, might very well be the winged seed 
of a pine, the presence of which genus in the Amboy flora is proven by 
fascicles of leaves. 
Localities: Woodbridge, South Amboy. 
Order RHAMNACE£. 
Ruamnires mrvor Hollick n. sp. 
Pl. XLII, fig. 36. 
+)mm 
Leaf small, about 19" or 20" long by 22" or 23™" broad at middle, 
slightly decurrent at the wedge-shaped base, rounded at apex; nervation 
fine, camptodrome, lower secondaries leaving the midrib at an acute angle, 
upper ones less so. 
It is not unlike R. apiculatus Lesq. (Fl. Dak. Gr., p. 171, Pl. XXXVI, 
figs. 8-13), but is considerably smaller and is not mucronate. 
Dr. Newberry left no indication of name or locality in connection with 
either figure or specimen.—A. H. 
