ACERACEAE 173 



ACER — continued 



A. dasycarpum {A. eriocarpum, A. saccharinum). Silver Maple. 120. April. 

 D. Ls. 4, deeply 5-lobed, double-toothed, bright green above, white 

 below. Fls. greenish, without petals. Wings of fruit sickle-shaped. East 

 North America. (Fig. 24 D.) 

 A. japonicum. 30. May. D. Ls. roundish, 5, 7-11-lobed, double-toothed. 

 Fls. purple, in long-stalked nodding clusters. Wings of fruit nearly 

 horizontal. Japan. (Fig. 25 D.) 

 A. laetum {A. cappadocium). 60. May-June. D. Ls. 5, 5-7-lobed, lobes not 

 toothed. Fls. pale yellow. Caucasus. (Fig. 25 c.) 



Variety colchicum ruhrum. Branchlets reddish. Ls. red when young, 

 green with red margin when older. 

 A. macrophyllum. Oregon Maple. 100. April-May. D. Ls. 12, cut more 



than half-way to base, stalk milky. California and Oregon (Fig. 24 a.) 

 A. palmatum. Japanese Maple. 25. May. D. Ls. 4, deeply 5-9-lobed; lobes 

 lane, double - toothed, long - pointed. Fls. purple. Wings of fruit 

 spreading and curved inwards forming a broad arch (Bean). Japan. 

 (Fig. 25 B.) 



Variety atropurpureum. Ls. purple. 

 Variety dissectum. Ls. digitate (see {c) below). 

 A. ruhrum. Red Maple. 100. March-April. D. Ls. 4, 3-5-lobed, unevenly 

 toothed, dark glossy green above, white below. Fls. red. Narrow angle 

 between wings of fruit. U.S.A. (Fig. 23 c.) 



Variety sanguineum. Ls. downy, richer red in autumn. Fls. brilliant 

 red. 

 A. saccharum. Sugar Maple. 100. May. D. Ls. 4, 5-lobed, lobes with a few 

 coarse teeth, light green or glaucous below. Fls. greenish yellow, bell- 

 shaped. Wide angle between wings of fruit. East North America. 

 (Fig. 23 H.) 

 A. platanoides. Norway Maple. 70. April-May. D. Ls. 7, 5-lobed, lobes 

 coarsely and remotely toothed, spaces between teeth rounded, green 

 below, hairless except for tufts in vein-axils below, stalk with milky juice. 

 Fls. greenish yellow, in erect clusters. Fruit drooping, wings nearly 

 horizontal. Europe. (Fig. 23 b.) 



Variety aureo-marginatum. Ls. with yellow margin, sometimes blotched 

 with yellow. 



Variety laciniatum. Eagle's Claw Maple. Ls. with tapering base, lobes 



curved downwards. 



A. Pseudoplatanus. Sycamore. 100. April-May. D. Ls. 6, 5-lobed, coarsely 



double-toothed, grey below. Fls. yellowish green, in drooping panicles. 



Wings of fruit at acute or right angle. Europe (including Britain) and 



West Asia. (Fig. 23 a.) 



(c) Ls. compound 



A. griseum. 40. May-June. D. Bark smooth, shining, copper-coloured, 

 flaking. Ls. 3-fol.; Iflts. ov., lane, 2\, with a few large blunt teeth, 

 blue-grey below. Wings of fruit at acute or right angle. Cochin China. 

 (Fig. I B.) 



A. Negundo. Box Elder. 70. March. D. Ls. 3-fol. or pinnate; Iflts. ov., 



