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VI. Leaves simple, five-lobed; basal lobes well developed; green beneath; margin serrate; petiole without latex.

39. Acer Oliverianum,^[1] Pax. Central China.

Leaves 3½ inches long, 4 inches broad; lobes long acuminate, finely and simply serrate; glabrous beneath, except for pubescent tufts at the base and in the axils of the primary and secondary nerves.

A small tree, 20 feet in height. Introduced by Wilson in 1901. Plants at Coombe Wood are thriving, and are about 12 feet high.

40. Acer argutum, Maximowicz. Japan.

Leaves about 3 inches long and broad; lobes triangular, acuminate, sharply bi-serrate; lower surface with scattered white pubescence, dense on the nerves and veinlets. Young branches densely pubescent.

A small tree, introduced by Maries in 1881. There are small specimens in the Kew Collection, and a good-sized one at Westonbirt.

40a. Acer palmatum, Thunberg. (See No. 46.)

 

VII. Leaves simple, five-lobed; basal lobes well developed; green beneath; margin with a few teeth or lobules, ciliate.

* Petiole containing latex.

41. Acer campestre, Linnæus. Europe, Caucasus, Northern Persia.

Leaves (Plate 207, Figs. 23, 24, 25) 2½ inches long, 3 inches broad; margin irregularly and obtusely dentate; dark-green, and pubescent on the nerves above; light-green beneath with scattered pubescence, densest on the nerves, and tufted in the axils. (See description, p. 651.)

42. Acer macrophyllum, Pursh. Alaska to California.

Leaves (Plate 205, Fig. 3) about 9 inches long and broad; margin with large triangular lobules or teeth; upper surface dark-green, shining, scattered pubescent; lower surface light-green, glabrescent between the nerves, with tufts of white pubescence in the axils. (See description, p. 681.)

43. Acer Miyabei, Maximowicz. Yezo.

Leaves 5 inches long, 6 inches broad; lobes with long acuminate obtuse-tipped apex, and with one or two pairs of obtuse lobules; sinuses narrow, acute at the base; both surfaces pubescent, densest on the nerves; petiole and young branchlets pubescent.

A tree, attaining 40 feet in height. Introduced by Sargent, who obtained seeds from Miyabe in 1892. There are young trees at Kew and Coombe Wood; and one at Grayswood, near Haslemere, was about 18 feet high in 1906.

** Petiole without latex.

44. Acer diabolicum,^[2] Blume. Japan.

Leaves (Plate 207, Fig. 26) 6 inches long, 6½ inches wide; lobes short,

1. Acer sp. in J.H. Veitch, Journ. Roy. Hort. Soc. xxix. 354, fig. 98 (1904).
2. Specimens of reputed Acer Francheti, Pax, from Coombe Wood, introduced by Wilson in 1901, are indistinguishable from this species. Cf. Journ. Roy. Hort. Soc. 353, fig. 88 (1904).