ented by
a single genus:

GENUS 11. =TILIA.=

Trees with alternate, deciduous, obliquely heart-shaped, serrate leaves,
about as broad as long. Leaves two-ranked on the stem. Flowers small,
cream-colored, fragrant, in clusters on a peculiar, oblong, leaf-like
bract. Fruit small (1/8 in.), globular, woody, in clusters from the same
bract. Wood white and soft; inner bark very fibrous and tough.

* Flowers with petal-like scales among the stamens; American
species. (=A.=)

=A.= Leaves very large, 6 to 8 in. 3.

=A.= Leaves medium, 4 to 6 in. 1.

=A.= Leaves small, 2 to 3 in. 2.

* Flowers with no petal-like scales among the stamens. 4.

[Illustration: T. Americana.]

1. =Tilia Americana=, L. (BASSWOOD. WHITEWOOD. LINDEN.) Leaves large, 4
to 6 in. long, green and smooth, or very nearly so, thickish. Fruit
ovoid, somewhat ribbed, 1/4 in. broad, greenish when ripe in October, on
a bract which is usually tapering to the base. Tall tree, 60 to 80 ft.
high, wild in rich woods and often cultivated.

[Illustration: T. pubescens.]

2. =Tilia pubescens=, Ait. (SMALL-LEAVED BASSWOOD.) Leaves smaller, 2 to
3 in. long, thinner and rather pubescent beneath. Fruit globose, 1/5
in. broad, on a bract usually quite rounded at base.

This is usually considered as a variety of the last-named species. It is
found from New York south and west.

[Illustration: T. heterophylla.]

3. =Tilia heterophylla=, Vent. (WHITE BASSWOOD.) Leaves large, often 8
in. broad, smooth and bright green above, silvery white and downy
beneath, with darker, purplish veins. A large tree; wild in
Pennsylvania, west and south, and often cultivated.

[Illustration: T. Europaea.]

4. =Tilia Europaea=, Mill. (EUROPEAN LINDEN.) Leaves twice as long as
the petioles, and smooth except a woolly tuft in the axils of the veins
beneath. Small and large leaved varieties are in cultivation. The
flowers have no petal-like scales among the stamens, while the American
species have. An ornamental tree with dense foliage; often cultivated
from Europe. The twigs are more numerous and more slender than those of
the American species. Nearly a score of named varieties are in
cultivation. Var. _laciniata_ has deeply cut and twisted leaves.

ORDER =IX. RUTACEAE.= (RUE FAMILY.)

Shrubs and trees, rarely herbs, in most cases with tr