226 
Winter buds blunt, exposed scales 6-8, reddish, tomen- 
tose ciliate; flowers appearing before the leaves. 
Sides of the V-shaped notches of the leaves straight, 
lobes of the leaves usually 3; flowers with petals, 
on pedicels; young fruit glabrous................. 2 A. rubrum. 
Sides of the V-shaped notches of the leaves concave, 
lobes of the leaves usually 5; flowers without pet- 
als, sub-sessile; young fruit tomentose........... 3 A. saccharinum. 
Winter buds acute, exposed scales 8-16, usually 12-16, 
brown to nearly black, usually with a silky pub- 
escence; flowers appear after the leaves. 
Bark usually gray; leaves whitish or glaucous be- 
neath, glabrous at maturity, appendages at the 
base of the petioles wanting:..34 o44. sss ae 4 A. saccharum. 
Bark dark brown to nearly black; leaves green be- 
neath, pubescent at least on the veins beneath 
at maturity, and with two appendages at the 
basexofathepetioleswanircne scp aetn ae ate cee 5 A. nigrum. 
1. Acer Negindo Linnzus. Box Exper. Plate 109. Bark on 
young trees gray and smooth, on old trees thick, light to dark brown 
and deeply fissured, very much resembling the bark of Fraxinus 
pennsylvanica; twigs smooth, light green, sometimes purplish and 
glaucous; leaves usually with 3 leaflets, sometimes with 5, leaflets 
thin, varying from ovate to oval or obovate, acute at the apex, 
rounded or wedge-shaped at the base, margin entire, coarsely ser- 
rate or rarely 3-lobed, pubescent on both sides when young, becom- 
ing smooth or nearly so at maturity, 5-10 cm. (2-4 inches) long; 
flowers appear with the leaves in clusters borne on the twigs of the 
past season, the staminate and pistillate in different clusters on 
different trees or sometimes on the same tree, flowering period 
April, May or June; fruit ripens in early summer, the samaras 
smooth or slightly pubescent, 2-4 em. (34-11% inches) long. 
Distribution. Western Vermont south to Florida and west to 
the Rocky Mountains. Rare east of the Appalachian Mountains. 
Rare to infrequent in northern Indiana, increasing in numbers in 
the southern counties where it is sometimes frequent, or sometimes 
common along streams. It is generally found near streams, lakes 
and swamps. It is usually a medium sized tree, attaining its 
greatest size in the southwestern counties. 
The published records of the distribution are as follows: Car- 
roll (Thompson); Cass (Hessler); Clark (Baird and Taylor); Daviess 
(Clements); Dearborn (Collins); Delaware (Phinney); Fountain 
(Brown); Franklin (Meyncke); Gibson (Schneck); Hamilton (Wil- 
son); Jay (M’Caslin); Jefferson (Barnes), (Coulter) and (Young); 
