172 ACERACEAE 



Family 37. ACERACEAE. K4-5, C4-5 or o, A8, G (2) 



ACER. Maple, Ls. opposite, long-stalked, usually palmately lobed. Fls. small, 

 yellowish or greenish, usually 5-parted, in branched clusters or panicles. Fruit 

 2-winged. 



(a) Ls. usually ^-lobed 



A. crataegifolium. Hawthorn Maple. 25. April. D, Branchlets purplish. 

 Ls. variously shaped, 3, 2-5-lobed, unevenly toothed, bluish green, hair- 

 less. Fl. panicles erect. China and Japan. (Fig. 23 e.) 

 Variety Veitchii. Ls. marbled with rose and white. 



A. creticum {A. orientale). Cretan Maple. 15, April. ^ E. Ls. 1 1, often not 

 lobed, entirely or faintly toothed, hairless, leathery. Fls. in erect clusters. 

 Wings of fruit parallel. East Mediterranean region. (Fig. 24 e.) 



A. Ginnala {A. tataricum, variety Ginnala). 20. June. D. Branches slender, 

 arching. Ls. 3, middle lobe much longer than side ones, round-toothed, 

 hairless. Wings of fruit, nearly parallel. China and Japan. (Fig. 25 a.) 



A. monspessulanum. Montpelier Maple. 25. May. D. Ls, 2, usually broader 

 than long, base heart-shaped, lobes entire or nearly so. Fls. greenish 

 yellow, in drooping clusters. Wings of fruit spreading at wide angle. 

 South Europe and West Asia. (Fig. 23 G.) 



A. pennsylvanicum. Moose Wood, Snake-bark Maple. 30. May. D. Branch- 

 lets green, striped with white lines. Ls. ov., 3, lobed near apex, double- 

 toothed, heart-shaped base, reddish hairs below when young. Fls. 

 yellow, in drooping panicles. Wings of fruit spreading at wide angle. 

 East United States. (Fig. 24 b.) 



A. ruhrum. See {b) below. 



A. rufinerve. 30. May-June. D. Bark smooth, dark green, with long pale 

 vertical stripes. Branchlets bluish white. Ls. ov., 5, sometimes vaguely 

 5-lobed, finely and unevenly toothed, reddish hairs on veins below when 

 young. Fl. panicles erect. China and Japan. (Fig. 23 f.) 



A. tataricum. Tartarian Maple. Ls. ov., 4, unevenly double-toothed. Fls. 

 greenish white, in long upright panicle. Fruit red, wings nearly parallel. 

 East Europe. 



(b) Ls. usually with 5 or more lobes 



A. campestre. Common Maple. 35. May. D. Branchlets often corky. Ls. 3, 

 lobes rounded, each with a few rounded teeth or entire, stalk with milky 

 juice. Fls, greenish, in upright clusters. Wings of fruit spreading 

 horizontally, Europe (including Britain), (Fig. 23 D.) 

 Variety postelense. Ls. golden yellow. 

 Variety puherulentum. Ls. speckled with white. 

 Variety Schwerinii. Ls. purple. 

 Variety variegatum. Ls. edged with white. 

 A. circinatum. Vine Maple. 30. April-May. D. Bark smooth, red. Ls. 

 almost circular, 5, 7-9-lobed, unevenly toothed. Fls. \, in small branched 

 clusters, sepals purple, petals white. Wings of fruit spreading horizon- 

 tally. California. (Fig. 24 c.) 

 A. crataegifolium. See {a) above. 



