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 villosiim, 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 cultiva- 

 tion, at Grayswood, Haslemere, remains shrubby. 



VIII. Leaves simple; lobes more than five, sharply bi-serrate ; petiole without 



latex. 



* Petioles glabrous. 



46. Acer palmaium, 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 40 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 



' Loudon, Encycl. Trees, 90. The largest specimen which we have seen is at Waterer's Nursery, Knaphill, Woking. 

 ' Cf. J. H. Veitch, _/or. Roy. liort. Soc. xxix. 338 (1904). 



