202 



ACER 



ACER 



96. Acer saccharinum (or A. dasycar- 

 pum). Silver or soft maple. ( X M) 



long, long-acuminate, cordate at the base, sharply 

 serrate, green beneath, soon glabrous: racemes slender, 

 pendulous, glabrous; fls. yellowish: wings of fr. spread- 

 ing at right angles, rarely horizontally. W. China. 

 Pax 35. Var. longilobum, Rehd. Lvs. distinctly 5- 

 lobed, upper pair of lobes long-acuminate, floccose- 

 tomentose on the veins beneath while young: fls. pur- 

 ple. W. China. More graceful than the typical form. 

 30. crataegif&lium, Sieb. & Zucc. Small tree, to 30 ft. : 

 Ivs. oblong-ovate, often with 2 or 4 lobes near the base, 

 2-3 in. long, acuminate, rounded or cordate at the base, 



unequally serrate, 

 bluish gray be- 

 neath : racemes 5-8- 

 fld., glabrous: fr. 

 on pedicels about 

 J^in. long; wings 

 nearly horizontal. 

 Japan. S.Z. 1 : 147. 

 S.I.F. l:67.-Grace- 

 ful species; hardy 

 at the Arnold Ar- 

 boretum. 



31. Tschon6skii, 

 Maxim. Small tree, 

 to 15 ft.: Ivs. orbic- 

 ular-ovate in out- 

 line, 5-, or rarely 

 7-lobed, l%-4 in. 

 long, light green be- 

 neath and rufously 

 pubescent on the 

 veins, finally gla- 

 brous or nearly so; 

 lobes ovate, long-acuminate, sharply and doubly serrate, 

 the middle one slightly lobed: racemes slender, few-fld.: 

 fr. on slender, filiform stalks; wings spreading at about 

 right angles. Japan. S.T.S. 1:17. S.I.F. 2:43. Grace- 

 ful shrubby tree; hardy at the Arnold Arboretum. 



32. rufinerve, Sieb. & Zucc. Tree, to 40 ft., withstriped 

 bark: branches glaucous when young: Ivs. rounded at 

 the base, 3-lobed, 3-5 in. long, doubly serrate, ferru- 

 gineously pubescent on the veins beneath when young: 

 racemes ferrugineously pubescent: fr. short-stalked; 

 wings spreading at right angles. Japan. S.Z. 2 : 148. 

 S.I.F. 1:67. Var. filbo-limbatum, Hook. Lvs. edged 

 with white. B.M. 5793. 



33. pennsylvanicum, Linn. (A. slriatum, Dur.). 

 STRIPED MAPLE. MOOSE WOOD. Tree, rarely 40 ft.: 

 bark greenish, striped with white lines: Ivs. slightly 

 cordate, roundish-obovate, 3-lobed at the apex, 5-7 in. 

 long, finely serrate, ferrugineously pubescent on the 

 whole lower surface when young: racemes glabrous, 

 drooping: fr. short-stalked, in long, drooping racemes; 

 wings spreading at right angles. E. N. Amer. S.S. 

 2:84, 85. Michx. Hist. Arb. 2:17. Em. 566. H.T. 

 330. Handsome medium-sized tree of upright, dense 

 habit, with bright green, large foliage, turning clear 

 yellow in autumn, and attractive even in winter from 

 its smooth, greenish bark, striped with white. Var. 

 erythrocladum, Spaeth. Shoots bright red during 

 autumn and winter. 



Section ARGUTA. 



34. tetramerum, Pax. Tree, to 25 ft: branchlets 

 glabrous: Ivs. ovate to oblong-ovate, 2-3 J^ in. long, 

 acuminate, truncate or rounded and usually 3-nerved 

 at the base, unequally incisely serrate or sometimes 

 slightly lobed, . light green and pubescent beneath, 

 rarely nearly glabrous: staminate fls. in few-fld. sessile 

 racemes from lateral leafless buds; stamens 4 or some- 

 times 6; disk lobed; pistillate fls. in elongated racemes, 

 usually few-fld.: fr. slender-stalked; nutlet thick, 

 strongly veined. Cent, and W. China. S.T.S. 1:86. 

 Graceful, hardy tree, very variable. Var. lobulatum, 



Rehd. Lvs. distinctly lobed, nearly glabrous. J.H.S. 

 29:352,355. Var. betulifaiium, Rehd. (A.betulifdlium, 

 Maxim.) Lvs. not, or very slightly, lobed, rounded or 

 cuneate at the base, glabrous or glabrescent. Var. elo- 

 bulatum, Rehd. Lvs. not or scarcely lobed, long-acu- 

 minate, rounded and 3-nerved at the base, pubescent 

 beneath. Intro, as A. slachyophyllum, but the true 

 A. stachyophyllum is a Himalayan species, not in 

 cult. Var. tiliifolium, Rehd. Lvs. ovate, cordate 

 at the base, and 5-nerved, pubescent beneath. Var. 

 longeracemosum, Rehd. Lvs. like in var. elobulatum: 

 racemes to 6 in. long, slender. 



35. argutum, Maxim. Small tree, to 25 ft.: branch- 

 lets pubescent: Ivs. broadly ovate in outline, 5-, or 

 rarely 7-lobed, 2-3}^ in. long, pale green beneath and 

 grayish pubescent chiefly on the veins, finally nearly 

 glabrous; lobes ovate, long-acuminate, sharply serrate: 

 staminate fls. in short racemes from lateral leafless buds; 

 stamens 4; pistillate fls. in slender many-fld. racemes: 

 fr. slender-stalked, in pendulous racemes; wings spread- 

 ing horizontally. Japan. S.I.F. 1:69. S.T.S. 66. 

 Graceful shrubby tree; hardy at the Arnold Arboretum. 



Section RUBRA. 



36. saccharinum, Linn. (A. dasycdrpum, Ehrh. A. 

 eriocdrpum, Michx.). WHITE or SILVER MAPLE. Fig. 

 96. Large tree, 120 ft.: Ivs. deeply 5-lobed to 5-cleft, 

 4-6 in. long, green above, silvery white beneath; lobes 

 deeply and doubly serrate: fls. greenish yellow, apeta- 

 lous: fr. pubescent when young. E. N. Amer. S.S. 

 2:93. G.C. II. 1:37. Em. 556. H.T. 332. F.E. 32:443 

 (habit); 29:983 (habit). Ornamental tree, with wide- 

 spreading, slender branches, growing best in rich and 

 moist soil, but succeeds almost anywhere. Lvs. turn 

 clear yellow in fall. Many garden forms: Var. Wieri, 

 Schwerin (var. Wikri laciniatum, Hort.). Branches 

 pendulous: Ivs. deeply cleft, with dissected lobes. A 

 graceful variety, remarkable for its drooping branches 

 and finely divided foliage. M.D.G. 1903:628 (habit). 

 Var. heterophyllum, Pax (var. heterophyllum laciniatum, 

 Hort.). Upright: Ivs. deeply and unequally divided, 

 with narrow lobes. 



Var. tripartitum, Pax. 

 Upright: Ivs. 3-parted. 

 Var. lutescens, Spaeth. 

 Lvs. yellow, bronze- 

 colored when unfojd- 

 ing. Var. albo-varie- 

 gatum, Spaeth (var. 

 Juhlkei, Hort.). Lvs. 

 spotted with white or 

 rosy pink. 

 Var.crispum, 

 Schweri n. 

 Lvs. deeply ( 

 cut and 

 crimped. 

 Linnscus evi- 

 dently sup- 

 posed this 



species to be 97 Acer rubrum ._Red Maple. (Enlarged) 

 the sugar 



maple, and named it accordingly. He did not know 

 the true sugar maple. 



37. rubrum, Linn. RED, SCARLET or SWAMP MAPLE. 

 Fig. 97. Large tree, 120 ft.: Ivs. 3-5-lobed, 3-4 in. 

 long, green above, pale or glaucous beneath; lobes un- 

 equally and crenately serrate: fls. red or scarlet, rarely 

 yellowish; petals 5: fr. glabrous. E. N. Amer. S.S. 

 2:94. Em. 557. G.C. II. 1:173. H.T. 334. Very val- 

 uable tree for street and park planting; attractive at 

 every season from its excellent habit, earliness of the 

 scarlet fls., bright red frs. in late spring, and the 

 beautiful foliage, which turns bright scarlet or orange 

 in autumn. Var. columnare, Rehd. Of upright, colum- 



