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Acer
639
ovate, with obtusely tipped acuminate apex, and one or two pairs of coarse teeth ; upper surface dark-green, shining, with scattered pubescence densest on the nerves; lower surface pubescent, dense on the nerves, and forming axil-tufts; petioles and young branchlets pubescent.
- A tree, 30 feet high, remarkable for the stinging hairs on the fruit-carpels. Introduced by Maries in 1881, and about 20 feet high at Coombe Wood.
- 45. Acer villosum, Wallich. North-Western Himalayas.
- Leaves about 8 inches long and wide; lobes broadly ovate, caudate-acuminate, with a few crenate teeth ; pubescent on the primary nerves above; lower surface, petioles, and young branchlets densely pubescent.
- A large tree in its native home. A specimen, the only one seen in cultivation, at Grayswood, Haslemere, remains shrubby.
VIII. Leaves simple; lobes more than five, sharply bi-serrate; petiole without latex.
* Petioles glabrous.
- 46. Acer palmatum, Thunberg. Japan, Central China.
- Leaves about 3 inches in length and breadth; lobes usually seven, occasionally five, long acuminate; sinuses extending half the length of the blade or to near the base; glabrous on both surfaces, except for minute axil-tufts of pubescence beneath. Young branchlets glabrous.
- A tree, rarely attaining 50 feet in height. The type was introduced? in 1820, and in cultivation is a small tree, occasionally 25 feet high, with numerous small branches and extremely dense foliage. A very large number of horticultural varieties® have been produced in Japan, which are highly valued on account of the varied shape and colour of their leaves, and are commonly cultivated in Europe.
- 47. Acer circinatum, Pursh. British Columbia to California.
- Leaves (Plate 205, Fig. 5) about 4 inches long and broad; lobes seven to nine, acute ; sinuses reaching about one-third the length of the blade; scattered pubescent on both surfaces at first, ultimately glabrous except for minute traces of pubescence at the base on both sides. Young branchlets glabrous.
- A shrub or small tree, rarely 4o feet high. Introduced in 1826, perfectly hardy, and producing fruit freely.
** Petioles, with dense white long pubescence in spring, more or less persistent till autumn.
- 48. Acer japonicum, Thunberg. Japan.
- Leaves about 4 inches long and broad; lobes usually nine, acuminate ; sinuses reaching one-third the length of the blade; both surfaces scattered pubescent, with a tuft at the junction of the blade and petiole above, and axil-tufts beneath. Young branches glabrous.
- A small tree, attaining about 20 feet in height. Several varieties are
1 Loudon, Encycl. Trees, 90. The largest specimen which we have seen is at Waterer’s Nursery, Knaphill, Woking.
2 Cf. J.H. Veitch, Journ. Roy. Hort. Soc. xxix. 338 (1904).
