ACER 



13 



Bum, Arb. Musp. (A. tomentdsum, Desf. A. i-«6r»»i,var. 

 fiUgcns, Hort.). Of moderate growth: Ivs. 5-lobed, 

 pubescent beneath: fls. bright red. 



o. Fls. on long, pendulous, mostly hairy pedicels, in 

 almost sessile corymbs, appearing with the Ivs., 

 apetalous; sepals connate. 



3. s&ccharum, Marsh. {A. saccharhmm,Wangh., not 

 Linn. A. barbatum, Michx.). Sugar or Rock Maple. 

 Fig. 17. Large tree, 120 ft., v.-ith gray bark : Ivs. 3-5- 

 lobed, cordate, 3-G in. long, with narrow and deep si- 

 nuses; lobes acuminate, sparingly dentate, usually glau- 

 cous and glabrous beneath : fr. with little spreading 

 wings. E. N. Amer. S. 8.2:90. Em. 558. — An excellent 

 street and shade tree of upright, dense growth, turning 

 bright yellow and scarlet in autumn. It does well in 

 almost every soil. V.-ir. Rug61i (.1. Bug^li, Pax., A. 

 sdccharum, var. harliitfioii, Tre\.). Lvs. 3-lobed, gener- 

 ally broader than long, 2-5 in. across, pale green or glau- 

 cous beneath, and at length mostly glabrous, coriaceous; 

 lobes nearly entire. Centr. states. S.S. 2:91, as var. 

 nigrum. 



4. nigrum, Michx. (A. sacchar)nnm, var. nigrum, 

 Torr. & Gray. A. sdccharum, var. nigrum, Britt.). 

 Black Maple. Fig. 18. Large tree, 120 ft., with black 

 bark: Ivs. cordate, with the sinus mostly closed, gener- 

 ally 3-lobed, with broad sinuses, the sides of the blade 

 mostly drooping, green and pubescent beneath ; lobes 

 acute, entire or obtusely toothed : fr. with diverging 

 wings. Centr. states. — Similar to A. saechariim, but of 

 duller appearance and less dense habit. Var. monumen- 

 tile [A. saccharlnum var. monumentdle. Temple). Of 

 upright, columnar habit. 



5. Floridinum, ni,i|im. i J. J„, rl^Vniu . var. Florida- 

 num, Sa,ig.). Trrr, .. ' -<> ■■■ I : .tly truncate at 

 the base, 3-lobiil. I i n, beneath and 



mostly tomentos. . ■ . ■ "r slightly 3- 



lobed. Gulf stati:,,. .s..s. 2:;a. i...l'. l: lis. 



6. giandidentElttim, Nutt. Tree, 40 ft. ; petioles com- 

 paratively short ; Ivs. slightly cordate, 3-5-lobed, with 

 broad sinuses, 2-3 in. across, pubescent beneath, coria- 

 ceous; lobes acute or obtuse, entire or slightly 3-lobed: 

 corymbs few-flowered, short-stalked. Rocky Mts. S.S. 

 2:92. 



(or A dasycarpum) 



00. Fls. in distinctly peduncled corymbs or short um- 

 bellate racemes, mostly erect, with petals and 

 distinct sepals. 



D. Zivs^ 3-5-lobed, with obtuse, entire or obtusely toothed 

 lobes: corymbs short-stalked : ovary pubescent : 

 winter-buds with several outer scales. 

 7. Italum, Laulh. Small tree, 30 ft. : Ivs. 5-lobed, 3-5 



in. long, glaucous beneath and at length glabrous; lobes 



obtusely dentate, the middle ones often 3-lobed: corymbs 



somewhat drooping : fr. with slightly spreading wings. 

 S. Eu., Orient.— A variable species, similar to a small- 

 leaved sycamore maple. Var. HyTcanum, Pax. (A. 

 Eyrcclnum,¥.&M.. A. Taiiricum, Sort. A.trilobitum, 

 Hort., not Lam.). Petioles very slender, red, 2-4 in. 

 long ; segments of the Ivs. 3-lobed, with straight margins. 



16. Red Maple.— Acer rubrum. 



b. stamluate rtowers; a, c. pistillate flowets. 



8. camp^stre, Linn. Shrub or tree, occasionally 50 tt , 

 with corky branches : Ivs. 3-5-lobed, lJ^-3Hin. long, 

 green and pubescent beneath or nearly glabrous; lobes 

 entire or the middle ones slightly 3-lobed : corymbs 

 erect, hairy : fr. with horizontally spreading wings. 

 Eu., W. Asia. — Shrub or tree of moderate, dense growth, 

 with dull green foliage, valuable for planting as under- 

 growth and on dry ground. Many varieties and garden 

 forms : Var. argfinteo-variegatum, Hurt. Lvs. with 

 large white )>lcitilii-s. V:ir. pulverulentum, Hort. Lvs. 

 sprinkled witli white. Var. Austriacum, 1)( '. Usually^a 



Taiiricum, Booth. Shrub: lvs. 5-lobed; small, lobes 3- 

 lobed. Var. hebecdrpum, DC. Fr. and generally the lvs. 

 beneath pubescent. 



9. Monspessulanum, Linn. (A. trilobcitum, Lam.). 

 Slirul) "1- small tn-e, 25 ft.: lvs. 3-lobed, coriaceous, 1-3 

 in. arruss, ^liiiiing above, glaucous and glabrous be- 

 neath : ImIi, s , iitirc or with few obtuse teeth: corymbs 

 erect: fr. with slightly spreading wings. S. Eu., N. 

 Afr., W. Asia. — Shrub or small tree of slow growth, with 

 a dense, rounded head and in temperate regions nearly 

 evergreen foliage, thriving well in dry situations. Var. 

 IbSricum, Koch. (..1. Ib'ericum, Bieb.). Lvs. larger, the 

 inner lobes usually slightly 3-lobed, obtuse. 



DD. Lvs. 5- or 7-lobed, green on both sides; lobes pointed, 

 entire or with few pointed teeth: ovary glabrous: 

 winter-buds with several outer scales. 



10. trunc^tum, Bunge. Tree: lvs. deeply 5-lobed and 

 mostly truncate at the base, 2J^-4 in. across, glabrous; 

 lobes acuminate, setosely pointed, sometimes the middle 

 ones 3-lobed : fr. with short, diverging yellow wings. 

 N. China.-Hardy tree, with handsome, dense foliage. 



11. pictum, Thunb. Tree, 60 ft.: lvs. 5- or 7-lohed, 3-7 

 in. across, usually pubescent beneath when young ; 

 lobes entire, acuminate, sometimes very broad and short: 

 fls. yellow: wings of the fr. upright, brown or brownish 

 yellow, hardly twice as long as the nutlets. Manchuria, 

 Japan. Handsome tree, with bright green foliage. Var. 

 Mono, Maxim. Lvs. more cordate : wings of the fr. 

 reflexed. 



12. latum, C. A. Mey. Tree, 50 ft. : lvs. 5-7-lobed, 

 mostly cordate, 3-6 in. across, glabrous; lobes entire, 

 acuminate : fls. greenish yellow : wings 2-3 times as 

 long as the nutlets. Orient, Himalayas.— Much resem- 

 bling A. pictum., but lvs. lighter green and of more 

 membraneous texture. Var. rubrum, Hort. (A. Cdlchi- 

 cum, var. riibrum, Hort.). Lvs. dark blood-red when 



