246 ACERACE^. • Acer. 



at the lower margin. Seeds 1-2, erect, with little or no albumen. 

 P^mbryo curved, or nearly straight, with wrinkled foliaceous cotyle- 

 dons variously folded upon each other. — Trees or shrubs, with oppo- 

 site, palmately lobed or pinnately 3-5-foliolate, exstipulate leaves. 

 Flowers lateral or terminal, often by abortion polygamous or dicecious. 



1. ACER. Manch; DC. prodr. 1. p. 593. 



Flowers mostly polygamous. Petals colored like the sepals, often wanting. 

 Stamens 7-10, rarely 5. — Leaves simple. The sap of many species con- 

 tains sugar. — Maple. 



* Flojvers in racemes lermiiiating the leafy branches, appearing ajter the erohdiort 



oj the leaves. 



1. A. Pennsylvanicum (Linn.): leaves subcordate, finely and acutely 

 doubly serrate, 3-lobed at the extremity ; lobes with a slender serrate acumi- 

 nation ; racemes nodding ; flowers large ; petals obovate ; fruit glabrous, with 

 larc^e diverging Avings. — Linn. sy.^t. 1. p. 675 ; Michx. ! Ji. 2. p. 252 ; EII. 

 sk°l. p. 45"! ; Torr.i Ji. 1. p. 397; Hook. ji. Bor.-Am. 1. p. 111. A. stria- 

 tum. Lam. diet. 2. p. 381; Michx. f. sylv. 1. t. 45 ; DC. prodr. 1. p. 593 ; 

 Spach, in ann. sci. nat. (2. ser.) 2. p. 162. A. Canadense, Duham. arb. 

 1. 1. 12 ; Marsh, arbust. p. i. 



Canada! (lat. 51- ) to the Alleghany Mountains in Georgia, and Kentucky ! 

 abundant between lat. 43^-' and 45°. May. — A shrub or very small tree, with 

 a smooth green bark marked with stripes : the wood of no value. Flowers 

 yellowish-green. Leaves rarely somewhat 5-lobed, at length glabrous. — 

 Striped Maple. Moose-u-ood. Dog-xoood. 



2. A. spicatum (Lam.) : leaves pubescent beneath, subcordate, coarsely 

 serrate 3- or somewhat 5-lobed ; lobes with an entire acumination ; racemes 

 erect slio^htly compound ; petals linear-spatulate ; fruit nearly glabrous, witli 

 slio-htly ^diverging wings. — Lam., diet. 2. p. 381 (1786); DC. jnodr. I. c; 

 Spach,l. c. A. montanum. Ait. Kew. 3. p. 435 (1789); Michx.! I. c. ; 

 Mich.r. f. sylv. L 47 ; Ell. sk. I. p. 4:52; Hook. I.e. A. Pennsylvanicum, 

 DuRoi, harbk. t. 2 ; Wang. Amer. t. 12. /. 30. 



Cool rocky places ! with the same range as A. Pennsylvanicum : uncom- 

 mon south of lat. 41°. — May-June.— Shrub 6-10 feet high. Leaves shghtly 

 lobed, at length somewhat rugose. Flowers small, greenish. Raceme many- 

 flowered. Fruit often reddish. — Mountain Maple. 



3. A. macrophylhim (Pursh) : leaves large, very deeply 5-lobed; lobes 

 oblong or sliglitly cuneiform, entire or sinuately 3-lobed, the margins some- 

 what "repand"'; racemes nodding; flowers rather large ; petals obovate ; fruit 

 hispid Avith elongated slighdv diverging glabrous wings. — Piirsh, f. 1. p. 

 267; DC. prodr. 1. p. 594; Hook. ! ji. Bor.-Am. 1. p. 112, t. 38. 



Oregon ! common between lat. 40= and 50 ', along the alluvial banks of 

 rivers.'' April-May. — Trunk 40-90 feet high, 6-16 feet in circumference, 

 with widely spreading branches. Leaves [at length nearly glabrous] some- 

 times nearly a foot broad. Stamens 9—10 : filaments hairy below. Carpels 

 sometimes 3. Racemes elongated, the pedicels often aggregated (compound 

 below Pursh). Flowers yellow, fragrant. Sap as abundant as in any spe- 

 cies except A. saccharinum : the wood soft but beautifully veined. Douglas, 

 in Hook. " The wood is whitish, and resembles our curled maple." Autt. 



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