ACER 



ACER 



13 



sum, Arb. Muse. (A. tomentdsum, Desf. A. rubrum, var. 

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

 pubescent beneath: fls. bright red. 



BB. Bloom appearing with or after the Ivs., distinctly 



stalked. 

 C. Fls. on long, pendulous, mostly hairy pedicels, i. 



almost sessile corymbs, appearing with tin' Irs., 



apetalous; sejmls connate. 



3. saccharum, Marsh. (A. saccharlnum, Wangh., not 

 Linn. A. barbatum, Michx.). SUGAR or ROCK MAPLE. 

 Pig. 17. Large tree, 120 ft., with gray bark : Ivs. 3-5- 

 lobed, cordate, 3-6 in. long, with narrow and deep si- 

 nuses; lobes acuminate, sparingly dentate, usually glau- 

 cous and glabrous beneath : fr. mostly with spreading 

 wings. E. N. Amer. S.S.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. Var. Rugeli (A. Rugtli, Pax., A. 

 sJLccharum, var. barbdtum, Trel.). 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. 

 nig rum. 



4. nigrum, Michx. (A. saccharlnum, var. nlgrum, 

 Torr. & Gray. A. saccharum, var. nlgrum, 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 variable 

 wings. Centr. states. Similar to A. saccharum, but of 

 duller appearance and less dense habit. Var. monumen- 

 t&le (A. saccharlnum var. monumentale, Temple). Of 

 upright, columnar habit. 



5. Floridanum, Chapm. (A. barbdtum, var. Florida- 

 num, Sarg. ). Tree, rarely 50 ft.: Ivs. mostly truncate at 

 the base, 3-lobed, l%-3 in. across, glaucous beneath and 

 mostly tomentose ; lobes obtuse, entire or slightly 3- 

 lobed. Gulf states. S.S. 2:91. G.F. 4:148. 



6. grandidentatum, 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. 



somewhat drooping : fr. with slightly spreading wings. 

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

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

 Hyrcanum, F. & M. A. Tauricum, Hort. A. trilobdtum, 

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

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



Acer saccharinum (or A. dasycarpum). 



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

 bellate racemes, mostly erect, with petals and 

 distinct sepals. 



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



lobes: corymbs short-stalked : ovary pubescent : 



winter-buds with several outer scales. 



1. Italum, Lauth. 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 



16. Red Maple. Acer rubrum. 

 b. staminate flowers; a, c, pistillate flowevs. 



v 8. campestre, Linn. Shrub or tree, occasionally 50 ft , 

 with corky branches : Ivs. 3-5-lobed, !%-3%in. long, 

 green and pubescent bene>th 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. argenteo-variegatum, Hort. Lvs. with 

 large white blotches. Var. pulverulentum, Hort. Lvs. 

 sprinkled with white. Var. Austrlacum, DC. Usually a 

 tree : Ivs. 5-lobed, with acute, nearly entire lobes. Var. 

 Tauricum, Booth. Shrub: Ivs. 5-lobed; small, lobes 3- 

 lobed. Var. hebecarpum, DC. Fr. and generally the Ivs. 

 beneath pubescent. 



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

 Shrub or small tree, 25 ft.: Ivs. 3-lobed, coriaceous, 1-3 

 in. across, shining above, glaucous and glabrous be- 

 neath ; lobes entire 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. 

 Ibericum, Koch. (A. Ibericum, 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. truncatum, Bunge. Tree: Ivs. deeply 5-lobed and 

 mostly truncate at the base, 2%-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. : Ivs. 5- or 7-lobed, 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 



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

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

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

 reflexed. 



12. IsBtum, C. A. Mey. Tree, 50 ft. : Ivs. 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 Ivs. lighter green and of more 

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

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



