appear as the tree matures; in old
trees coarsely, deeply, and firmly ridged, not flaky; larger branches a
dull brown, rough; branchlets grayish-brown, armed with prickles;
season's shoots green, more or less rough-dotted, thin, and often
striped.

=Winter Buds and Leaves.=--Winter buds minute, partially sunken within
the leaf-scar. Leaves pinnately compound, alternate; petiole swollen at
the base, covering bud of the next season; often with spines in the
place of stipules; leaflets 7-21, opposite or scattered, 3/4-1-1/4
inches long, about half as wide, light green; outline ovate or
oval-oblong; apex round or obtuse, tipped with a minute point; base
truncate, rounded, obtuse or acutish; distinctly short-stalked;
stipellate at first.

=Inflorescence.=--Late May or early June. Showy and abundant, in loose,
pendent, axillary racemes; calyx short, bell-shaped, 5-cleft, the two
upper segments mostly coherent; corolla shaped like a pea blossom, the
upper petal large, side petals obtuse and separate; style and stigma
simple.

=Fruit.=--A smooth, dark brown, flat pod, about 3 inches long,
containing several small brown flattish seeds, remaining on the tree
throughout the winter.

=Horticultural Value.=--Hardy throughout New England in all dry, sunny
situations, of rapid growth, spreading by underground stems, ordinarily
short-lived and subject to serious injury by the attacks of borers.
Occasionally procurable in large quantities at a low rate. In Europe
there are many horticultural forms, a few of which are occasionally
offered in American nurseries. The type is propagated from seed, the
forms by grafting.

[Illustration: PLATE LXVII.--Robinia Pseudacacia.]

1. Winter buds.
2. Flowering branch.
3. Flower with corolla removed.
4. Fruiting branch.

=Robinia viscosa, Vent.=

CLAMMY LOCUST.

This tree appears to be sparingly established in southern Canada and at
many points throughout New England.

Common in cultivation and occasionally established through the middle
states; native from Virginia along the mountains of North Carolina,
South Carolina, and Georgia.

Easily distinguished from _R. Pseudacacia_ by its smaller size,
glandular, viscid branchlets, later period of blossoming, and by its
more compact, usually upright, scarcely fragrant, rose-colored
flower-clusters.

SIMARUBACEAE. AILANTHUS FAMILY.

=Ailanthus glandulosus, Desf.=

AILANTHUS. TREE-OF-HEAVEN. CHINESE SUMAC.

Sparsely