298 
The Ohio Naturalist. 
[Vol. V, No. 5, 
3. Terminal buds large, angular, more or less pointed, glabrous except at 
the margins of the scales; bud scales very fleshy; twigs robust; not 
red. 4. 
3. Terminal buds rather small, pointed or obtuse, pubescent, not very 
angular; scales dry or if rather fleshy then the twigs red or reddish; 
twigs usually slender. .5. 
4. Twigs slender, brownish or grayish, not glaucous; leaf scars meeting 
in a free point; buds large, fleshy, slightly greenish to dark red; 
outer surface of 4-G inner scales chestnut brown; cultivated. 
Acer platanoides L. Norway Maple. 
4. Twigs stout, greenish brown to gray, glaucous; leaf scars usually not 
contiguous; buds large, fleshy, green or slightly tinged with red; 
outer surface of inner scales not chestnut brown; twigs with self- 
pruning scars; cultivated. 
Acer pseiido-plataniis L. Sycamore Maple. 
5. Twigs closely gray pubescent; buds small, evidently stalked; shrubs 
or rarely small trees. Acer ’ spicat inn Lam. Nlountain ilaple. 
5. Twigs glabrous; buds short-stalked or sessile; large trees. 6. 
(). Buds rounded, robust, fleshy, reddish in color; visible scales 2-8; leaf 
scars rarely contiguous; twigs with self-pruning scars. 7. 
(). Buds slender, pointed, dry. brownish to brownish gray, sometimes 
nearly black at tip; visible scales 6-1 G; leaf scars contiguous or 
nearly so ; twigs without self-pruning scars. 8 
7. Twigs glabrous, brownish to red; bark gray, falling away in large, thin 
flakes on old trees. Acer saccharinum L. Silver Maple. 
7. Twigs glabrous, reddish to red; bark light gray, rough on old trees, 
but not falling away in large pieces. Acer riibrnm L. Red Maple. 
8. Twigs reddish brown or buff, mostly glossy; buds conical, acute, gray, 
pubescent ; limb of leaf scars less prominent because of the absence 
of stipules; ridge connecting leaf scars only slightly pubescent; 
bark of trunk dark gray or gray, somewhat spreading. 
Acer saccharitm Marsh. Sugar staple. 
8. Twigs greenish to gray buff, dull; buds ovoid, conical, often obtuse; 
limb of leaf scars more prominent because of the presence of 
stipules; ridge connecting leaf scars prominently pubescent; 
lenticcls prominent and usually many; bark of trunk black, rather 
clo.se. Acer nignnn Michx. Black Maple. 
THE CLASSIFICATION OF PLANTS, I. 
JOH.X H. SCHAFFXER. 
It is the intention of the writer to give from time to time, for 
the use of students, a series of notes on the classification of plants. 
The disposition made of the plant kingdom will rej)resent the 
writer’s own views although much has been borrowed from 
various sources. 
The classification of the plant kingdom should be an expres- 
sion of its evolutionary history so far as known or it should at 
least be an attempt at such an expression. It should be based 
on the doctrine of descent. A natural arrangement should take 
account of the ])rogressive advancement of plants from the lowest 
to the highest types as well as of the segregation of great branches 
or groups and the origin of large numbers of species belonging to 
the same general level. In other words, the scheme should 
