84 SAPINDACEJE. (SOAPBERRY FAMILY.) 



SUBORDER HI. ACERINEJE. THE MAPLE FAMILY. 



3. ACER, Tourn. MAPLE. 



Flowers polygamous. Calyx colored, 5- (rarely 4 - 12-) lobed or parted. Pet- 

 als either none, or as many as the lobes of the calyx, equal, with short claws 

 if any, inserted on the margin of the lobed disk, which, is either perigynous or 

 hypogynous. Stamens 4-12. Ovary 2-celled, with a pair of ovules in each: 

 styles 2, long and slender, united only below, stigmatic down the inside. From 

 the back of each ovaiy grows a wing, converting the fruit into two 1 -seeded, at 

 length separable, closed samaras or keys. Seed without albumen. Embryo 

 variously coiled or folded, with large and thin cotyledons. Trees, or some- 

 times shrubs, with opposite palmately-lobed leaves, and small flowers. Pedi 

 eels not jointed. (The classical name, from the Celtic ac, hard.) 

 * Flowers in terminal racemes, greenish, appearing after the leaves : stamens 6-8. 



1. A. Peniisylvauiciim, L. (STRIPED MAPLE.) Leaves 3-lobed 

 at the apex, finely and sharply doubly serrate ; the short lobes taper-pointed, 

 and also serrate ; racemes drooping, loose ; petals obovate ; fruit with large diverg- 

 ing wings. (A. striatum, Lam.} Rich woods, Maine to Wisconsin, and north 

 ward along the Alleghanies to Virginia and Kentucky. June. A small and 

 slender tree, with light-green bark striped with dark lines, and greenish flowers 

 and fruit. Also called Striped Dogwood, and Moose- Wood. 



2. A. spicatuin, Lam. -(MOUNTAIN MAPLE.) Leaves downy under- 

 neath, 3- (or slightly 5-) lobed, coarsely serrate, the lobes taper-pointed ; racemes 

 upright, dense, somewhat compound ; petals linear-spatulate ; fruit with small very 

 divergent wings. (A. montanum, Ait.) Moist woods, with the same range 

 as-No. 1. June. A tall shrub, forming clumps. 



* % Flowers umbellate-corymbed, greenish-yellow, appearing with the leaves. 



3. A. saccharinum, Wang. (SUGAR MAPLE. ROCK MAPLE.) 

 Leaves 3 - 5-lobed, with rounded sinuses and pointed sparingly sinuate-toothed 

 lobes, either heart-shaped or nearly truncate at the base, whitish and smooth or 

 a little downy along the veins beneath ; flowers from terminal leaf-bearing and 

 lateral leafless buds, drooping on very slender hairy pedicels ; calyx hairy at the 

 apex ; petals none ; wings of the fruit broad, slightly diverging. Rich woods, 

 especially northward and along the mountains southward. April, May. A 

 large, handsome tree. . 



Var. nigrum. (BLACK SUGAR-MAPLE.) Leaves scarcely paler beneath, 

 but often minutely downy, the lobes wider, the sinus at the base often closed. 

 (A. nigrum, Michx.) With the ordinary form. 



# % * Flowers in umbel-like clusters arising from lateral leafless buds, preceding the 

 leaves: stamens 3-6. 



4. A. (lasycarpiiin, Ehrhart. (WHITE or SILVER MAPLE.) Leaves 

 very deeply 5-lobed with the sinuses rather acute, silvery- white (and when young 

 downy) underneath, the divisions narrow, cut-lobed and toothed ; flowers 

 (greenish-yellow) on short pedicels ; petals none ; fruit woolly when young, with 

 large divergent wings. River-banks, most common southwaid and westward. 

 March, April. A fine ornamental tree. 



