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672 the under surface, like the young branchlets and petioles, with hoary tomentum. Flowers and fruit bright scarlet. The variety is found in deep river swamps of Southern Arkansas, Eastern Texas and Western Louisiana.

2. Var. tridens, Wood.’ Leaves three-lobed at the apex, rounded or cuneate at the base, thick and firm in texture, serrate except towards the base with remote incurved glandular teeth. Flowers sometimes yellow; fruit usually much smaller and rarely also yellow. This variety occurs in the coast region from Southern New Jersey to Southern Florida, and along the Gulf Coast to Eastern Texas.

A large number of varieties, based on trivial characters, are given by Pax and von Schwerin as occurring in cultivation, the most noteworthy of which is var. sanguineum, with the leaves deeper green above, bluish-white beneath, and turning a brilliant red in autumn. In cultivated trees in England there are marked differences in the size and shape of the leaves and in the amount of pubescence on their under surface; but these differences are not worth naming. Columnar and bushy rounded forms are known; and a pendulous form is also mentioned in the

Kew Hand List, which seems, however, to be a form of A. dasycarpum. (A. H.)

In America this tree is one of the commonest and most widely distributed, extending from about lat. 49° N. in Quebec and Ontario, south to Florida and west to Wisconsin, Iowa, and the Trinity river in Texas; abundant in the Mississippi valley, and attaining its largest size on the lower Ohio and in the Wabash valley, where Ridgway measured a tree 108 feet by 15 feet, with a clean bole 60 feet long, and says that larger trees could be found. In New England it grows abundantly in swamps and low ground, and is usually a tree of no great size, so far as I have seen. Emerson records no large trees, while Michaux says that he nowhere saw it larger than in the swamps of New Jersey and Pennsylvania, where it is often 70 feet high and 3 to 4 feet in diameter. It is the earliest tree in flower and was nearly over in the middle of May, near Boston, when the leaves were partly developed. Emerson says that they vary remarkably in size and shape, being some- times broad and five-lobed, sometimes long and narrow, and are liable to become of a scarlet, crimson, or orange colour at all seasons, sometimes at midsummer, long before other trees have changed colour. He thinks that the frost has little to do with the autumnal coloration of leaves, and that the greater intensity of the light and transparency of the air is the reason why the leaves of trees usually turn so much more brilliant in colour in America than in Europe.

A fastigiate tree of this species is illustrated in Garden and Forest, vii. 65 (1894), where it is erroneously’ called a sugar maple. It grows in the grounds of Mrs. Leavitt at Flushing, New York, and is 80 feet high. Sargent adds that only two other American trees, the tulip tree and the Robinia, are known to have produced forms with fastigiate branches.

1 Cf. Rehder, in Rhodora, ix. 116 (1907).

2 Mr. W.A. Stiles, in a letter to Kew, dated March 28, 1894, corrects this error.