Corky Elm.) A large tree, not so desirable as the last for a shade or ornamental tree, on account of the roughness of its branchlets which arc flanked by corky wings.

Celtis, Tourn. (Nettle-tree. Hackberry.)

C. occidentalis, L. (Hackberry.) River banks.

OF WESTCHESTER COUNTY.

Morus, Tourn. (Mulberry.)

M. rubra, L. (Red Mulberry.) Fields and hedge-rows, a small tree from 20 to 30 feet high, bearing edible fruit ; the timber is hard and durable, the roots are much used for the knees of rowboats and skiffs.

M. alba. I,. (White Mulberry.) This tree grows taller than the last, reaching the height of 50 feet; the timber is soft anil brash, the fruit is white and edible; but insipid and less desirable than the last.

TJrtica, Toum. (Nettle.)

TJ. gracilis Ait. Waste, damp grounds.

XJ. dioica, L. Waste grounds about dwellings. (Nat. Eu.)

U. urens, L. Waste grounds near dwellings. (Nat. Eu.)

Laportea, Gaudichaud. Damp woods.

L. Canadensis, Gaudichaud. Damp woods.

Pilea, Lindl. (Clearweed.)

P. pumila, Gray. Shady places.

Boehnieria, Jacq. (False Nettle.)

B. cylindrica, Willd. Damp shady places.

Cannabis, Tourn. (Hemp.)

C. saliva, L. Escaped from cultivation. (Adv. Eu.)

Humulus, L. (Hop.)

H. Lupulus, L. Damp rich copses.

Order 100.-- PLAT ANACEiE. (Plane-tree Family.)

Platanus, L. (Plane-tree. Buttonwood.)

P. occidentalis, L. (Sycamore.) This a large tree planted for ornamental purposes, especially in rows by the load-sides.

Juglans, L.

J. cinerea, L. (Butter-nut,) Grows in the hills, and the rocks seem favorite places for it. The fruit is valuable, and the wood is used for cabinet purposes. It has a coarse grain but takes a good polish.