e are apt to vary so much in size and habit as to make them unsuitable
for street planting.

An attractive tree when young, especially when laden with fruit in the
fall. There are several horticultural varieties with colored foliage,
some of which are occasionally offered in nurseries. A western form,
having the new growth covered with a glaucous bloom, is said to be
longer-lived and more healthy than the type.

[Illustration: PLATE LXXVII.--Acer Negundo.]

1. Winter buds.
2. Branch with sterile flowers.
3. Sterile flower.
4. Branch with fertile flowers.
5. Fertile flower.
6. Fruiting branch.

TILIACEAE. LINDEN FAMILY.

=Tilia Americana, L.=

BASSWOOD. LINDEN. LIME. WHITEWOOD.

=Habitat and Range.=--In rich woods and loamy soils.

Southern Canada from New Brunswick to Lake Winnipeg.

Throughout New England, frequent from the seacoast to altitudes of 1000
feet; rare from 1000 to 2000 feet.

South along the mountains to Georgia; west to Kansas, Nebraska, and
Texas.

=Habit.=--A large tree, 5O-75 feet high, rising in the upper valley of
the Connecticut river to the height of 100 feet; trunk 2-4 feet in
diameter, erect, diminishing but slightly to the branching point; head,
in favorable situations, broadly ovate to oval, rather compact,
symmetrical; branches mostly straight, striking out in different trees
at varying angles; the numerous secondary branches mostly horizontal,
slender, often drooping at the extremities, repeatedly subdividing,
forming a dense spray set at broad angles. Foliage very abundant, green
when fully grown, almost impervious to sunlight; the small creamy
flowers in numerous clusters; the pale, odd-shaped bracts and pea-like
fruit conspicuous among the leaves till late autumn.

=Bark.=--Dark gray, very thick, smooth in young trees, later becoming
broadly and firmly ridged; in old trees irregularly furrowed; branches,
especially upon the upper side, dark brown and blackish; the season's
shoots yellowish-green to reddish-brown, and numerously rough-dotted.
The inner bark is fibrous and tough.

=Winter Buds and Leaves.=--Leaf-buds small, conical, brownish red,
contrasting strongly with the dark stems. Leaves simple, alternate, 4-5
inches long, three-fourths as wide, green and smooth on both sides,
thickish, paler beneath, broad-ovate, one-sided, serrate, the point
often incurved; apex acuminate or acute; base heart-shaped to truncate;
midrib and veins