ppi. Extensively cultivated for hedges, and also for ornament,
throughout.

GENUS =78. MORUS.=

Trees with milky juice and alternate, deciduous, exstipulate, broad,
heart-shaped, usually rough leaves. Flowers inconspicuous; in spring.
Fruit blackberry-like in shape and size; in summer.

* Leaves rough; fruit dark-colored 1.

* Leaves smooth and shining; fruit white to black 2.

[Illustration: M. rubra.]

1. =Morus rubra=, L. (RED MULBERRY.) Leaves broad, heart-shaped, 4 to 6
in. long, serrate, rough above and downy beneath, pointed; on the young
shoots irregularly lobed. Fruit dark red, almost purple when ripe,
cylindrical; not found on all the trees, as the flowers are somewhat
dioecious; ripe in July. Wood yellow, heavy and durable. Usually a
small tree, 15 to 60 ft. high; wild throughout, also cultivated.

[Illustration: M. alba.]

2. =Morus alba=, L. (WHITE MULBERRY.) Leaves obliquely heart-ovate,
pointed, serrate, smooth and shining; lobed on the younger growths; 2 to
7 in. long. Fruit whitish, oval to oblong; ripe in July. A small tree
from China, planted for feeding silkworms, but now naturalized
throughout.

Var. _multicaulis_ has large leaves, and is considered better for
silkworm food than the usual form. It is not very hardy, as it is
frequently winter-killed in the latitude of New York City.

Var. _Downingii_ (Downing's everbearing Mulberry) has large leaves and
very large, dark red or black fruit, of excellent flavor, which does not
ripen all at once as most Mulberries do.

GENUS =79. BROUSSONETIA.=

Trees with milky juice and alternate, deciduous, stipulate, broad, very
hairy leaves. Flowers dioecious. Fruit (only on a portion of the
plants) similar to the common Mulberry.

[Illustration: B. papyrifera.]

=Broussonetia papyrifera=, L. (PAPER-MULBERRY.) Leaves ovate to
heart-shaped, variously lobed, deeply so on the young suckers, serrate,
very rough above and quite soft-downy beneath; leaves on the old trees
almost without lobes; bark tough and fibrous. Flowers in catkins,
greenish; in spring. Fruit club-shaped, dark scarlet, sweet and insipid;
ripe in August. Small cultivated tree, 10 to 35 ft. high, hardy north to
New York; remarkable for the great variety in the forms of its leaves on
the young trees.

ORDER =XXXVII. PLATANACEAE.=

(PLANE-TREE FAMILY.)

A very small order, containing but one genus:

GENUS =80. PLATANU