Oxalis, L, (Wood-Sorrel -- Sheep-Sorrel.)

O. acetosella, L. In damp woods, not common.

O. violacea, L. Along fences and rocky places.

O. stricta, L. Along fences and cultivated grounds, common.

Order 25.-- RUTACE03. (Rue Family,)

Zanthoxylum, Colden. (Prickly Ash.) Z. Americanum, Mill, Rare.

Order 26-- ANACARDIACEiE, (Cashew Family,)

Rhus, L. (Sumach.)

R. typhina, L. Frequent on rocky hill-sides.

R. glabra, L. Common along fences.

R. copallina, L. Hill-sides. (Leggett.)

R. venenata, DC. Swamps and damp grounds.

R. toxicodendron, L. Common, especially along fences.

Order 27-VITACE(E, (Vine Family,)

Vitis, Toum.

V. Labrasca, L. Damp thickets and woods. V. aestivalis, Mx. Thickets. (Dr. Fisher.) V. cordifolia, Mx. Frost Grape, along streams.

OF WESTCHESTER COUNTY.

Ampelopsis, Mx. (Virginian Creeper,)

A. qninquefolia, Mx. Common in rich grounds.

Order 28-- EHAMNACEJE, (Eu.cktb.orn Family.)

Ceanothus, L. (New Jersey Tea -- Red-root.)

C. Americanus, L. Copses and borders of open woods.

Order 29-- CELASTEACE.E, (Staff-tree Family,)

Celastrus, L. (Staff-tree -- Bitter-sweet.) C. scandens, L. Frequent throughout.

Euonymus, Toum. (Burning Bush.)

E. atropurpureus, Jacq. About White Plains.

E. Americanus, L. Riverdale. Not common. (Hicknell.)

Order 30-- SAPINEACE.52, (Soapberry Family,) Staphylea, L. (Bladde-nut.)

S. trifolia, L. Throughout, sparingly.

Acer, Toum. (Maple.)

A. Pennsylvanicum, L, (Striped Maple.) A. spicatum, Lam. (Mountain Maple.)

A. saccharinuin, Wang, (Sugar Maple.) This is a favorite shade tree, on account of the well proportioned head it forms, and the beauty of its foliage. It is claimed that it is also a fever tree, i. e. When growing it absorbs so much water as to render malarial districts heathful. In the northern States sugar is manufactured from its sap.