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Acer
635
rounded, short, obtuse or acute; margin with small irregular teeth; petiole without latex. In var. neapolitanum, the leaves (Plate 206, Fig. 15) are more obscurely lobed, with very dense long pubescence beneath. (See description, p. 663.)
- 21. Acer grandidentatum, Nuttall. Montana southwards to New Mexico.
- Leaves (Plate 205, Fig. 4) 3 inches long, 4 inches broad, with three large oblong lobes, separated by sinuses extending half-way to the base,of the blade; margin with a few large obtuse lobules, otherwise entire ; under surface covered with pale dense pubescence ; basal lobes represented by the lowest pair of the marginal lobules.
- A small tree, rarely forty feet in height, representing the sugar maple in the West. There is a small specimen thriving in the Kew Collection.
- 22. Acer rubrum, Linnæus. North America.
- Leaves (Plate 207, Fig. 27) averaging 3 inches long and broad, variable in shape; under surface silvery white with scattered pubescence; lobes usually triangular, acute or acuminate, sharply toothed or bi-serrate in margin; sinuses acute at the base, variable in depth; base of the leaf truncate or rounded, rarely cordate. (See description, p. 671.)
- 23. Acer tetramerum,' Pax. Central China.
- Leaves 3 inches long, 2 inches broad, ovate, cordate at the base, indistinctly five-lobed ; basal lobes obscure or obsolete ; lateral lobes short, triangular, acute and sharply serrate; terminal lobe with two or three pairs of serrated teeth, and prolonged into a long narrow acuminate apex ; margin ciliate ; upper surface dark-green, scattered pubescent; lower surface pale, covered with white pubescence, densest in the axils ; petiole without latex.
- A small tree, introduced by Wilson in 1901. Young plants at Coombe Wood are perfectly hardy and free in growth, having already attained 16 feet in height.
IV. Leaves five-lobed ; basal lobes well-developed ; white or pale beneath ; petiole without latex.
* Leaves not serrate.
- 24. Acer Opalus, Miller. Southern Europe.
- Leaves (Plate 206, Fig. 14) 24 inches long, 3 inches wide; lobes short, acute, irregularly toothed; under surface with scattered pubescence, denser on the nerves and forming axil-tufts. (See description, p. 663.)
- 25. Acer saccharum, Marshall. North America.
- Leaves (Plate 206, Fig. 12) 5 inches long, 6 inches wide; lobes triangular, acuminate, with one or two pairs of sinuate teeth ; lower surface with axil-tufts of pubescence, elsewhere glabrous or more or less pubescent. (See description, p. 677.)
- 26. Acer hyrcanum, Fischer et Meyer. South-Eastern Europe, Crimea, Asia Minor, Caucasus.
1 Cf. J.H. Veitch, Journ. Roy. Hort. Soc. xxix. 353, fig. 97 (1904).
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