In relation to this genus Mr. Emerson remarks: - "It is found that a greater variety of beautiful small trees and orna-mental shrubs can be formed of the several species of Thorn, than of any kind of tree whatever. Thus they give persons whose grounds are not extensive, the means of ornamenting their grounds with great facility. If trained as trees, they have an appearance of singular neatness united with a good degree of vigor; and the readiness with which they are pruned and grafted renders them susceptible of almost any shape which the fancy of the owner would have them assume. Some of the species, native to Massachusetts, often take, even in a state of nature, the shape of handsome low trees. Of these, the flowers and foliage have great beauty, and the scarlet haws, which remain on into winter, till, ripened by frost, they are gathered by the birds, give them additional charms. Into these tall species all the others, very various, and many of them very beautiful, may be grafted; and not only thorns, but pears and other fruits, may be readily made to grow on the Thorn." The four principal species, natives of our State, are, Crataegus coccinnea, Scarlet-fruited Thorn; C. tomentosa, the Pear-leaved Thorn; C. crus-galli, the Cockspur Thorn, and C. punctata, the Dotted-fruited Thorn; - all handsome, with white, fragrant flowers, in clusters.
C. oxyacantha is the common Hawthorn of England, which is also an ornamental shrub, as well as a very important one for the formation of hedges. Of this species there are a number of beautiful varieties, which should be in every collection, viz., rosea, with deep-red flowers; double-white and double-red, which are very beautiful, besides some others not so well known.