ACER 



sum, Arb. Muso. {A. tomentbsum, Desf. A.ruhrumy-vax. 

 fiilgens, Hort.). Of moderate growth: Its. 5-lobed, 

 pubescent beneath: fis. bright red. 



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



stalked. 

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



almost sessile corymbs, appearing with the Ivs., 



apetalous; sepals connate. 



3. s&cchaium, Marsh. {A. saccharlnum, Waagb., not 

 Linn. A. barbatum, Miohx.). Sugar or Rook Maple. 

 Fig. 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. with little 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. Eug6U {A. Sugtti, Pax., A. 

 succharum, var. barb^um, 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. 

 nigrum. 



4. nigrum, Michx. [A. saccharlnum, var. nigrum, 

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

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

 bark: lvs. 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. saccharum, but of 

 duller appearance and less dense habit. Var. monumen- 

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

 upright, columnar habit. 



5. Florid&num, Chapm. {A. barb&tum, var. Floridd- 

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

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

 mostly tomentose ; lobes obtuse, entire or slightly 3- 

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



6. grandident^tum, Nutt. Tree, 40 ft. : petioles com- 

 paratively short ; lvs. 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. 

 3:92. 



ACER 



13 



15. Acer saccharinum (or A. dasycarpum). 



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

 bellate racemes, mostly erect, with petals and 

 distinct sepals. 



D. Zrvs. SS-lobed, with obtuse, entire or obtusely toothed 

 lobes : corymbs short-stalked : ovary pubescent : 

 winter-buds with several outer scales. 

 7. Italum, Lauth. Small tree, 30 ft. : lvs. 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. HyTcinum, Pax. (A. 

 Syrcd,num,'W.&M.. A. Tailricum, Sort. A.trilobdfum, 

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

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



16. Red Maple.— Acer rubrum. 



b, staminate flowers; a, c, pistillate flowei-a. 



8. campfistre, Linn. Shrub or tree, occasionally 50 It , 

 with corky branches : lvs. 3-5-lobed, lj^-3?^in. 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. arg^nteo-variegitum, Hort. Lvs. with 

 large white blotches. Var. pulverul6ntum, Hort. Lvs. 

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

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

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

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

 beneath pubescent. 



9. Monspessul^num, Linn. {A. trilobitum. Lam.). 

 Shrub or small tree, 25 ft.: lvs. 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. 

 Ib^ricum, Koch. {A. Ibericum, Bieb.). Lvs. larger, the 

 inner lobes usually slightly 3-lobed, obtuse. 



DD. Lvs. 5- or 7-lobed, green onboth sides; lobespointed, 

 entire or with few pointed teeth: ovary glabrous: 

 winter-buds with several outer scales. 



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

 mostly truncate at the base, 2K-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-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 

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

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

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

 reflexed. 



12. laetum, 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. rtibrum, Hort. {A. Cdlchi- 

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



