202 



ACER 



ACER 



long, long-acuminate, oordato at the baso, sharply 

 serrate, green beneatU, soon glahroiis: racemes slender, 

 pemliiloiis, glabrous; lis. yellowish: wings of fr. spread- 

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

 Pax 35. Var. longilobum, lielul. Lvs. distinotly 5- 

 lobtxl, upper pair of lobes long-aeuniinate, floeeose- 

 tonient<\<e on the veins beneath while young: fls. pur- 

 ple. ^\'. China. — More graceful than the typical form. 

 30. cratsegifolium, 8ieb. iV- Zvicc. Small tree, to 30 ft.: 

 lvs. oblong-ovate, often with 2 or 4 lobes near the ba.se, 

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



unequally serrate, 

 bluisli gray be- 

 neath: racemes 5-8- 

 fld., glabrous: fr. 

 on pedicels about. 

 J-4in. long; wings 

 nearly horizontal. 

 Japan. 8.Z. 1:147. 

 S.I.F. l:t)7.-Grace- 

 ful species; hardy 

 ■ at the Arnold Ar- 

 boretum. 



31. Tschonoskii, 

 Maxim. Small tree, 

 to 15 ft.: lvs. orbic- 

 ular-ovate in out- 

 line, 5-, or rarely 

 7-lobed, 1M~4 in. 

 long, light green be- 

 neath and rufously 

 96. Acer saccharinum (or A. dasycar- PU.bescent on t_he 

 pum).— SUverorsoftmaple. (.Xh) ,'^'<''"^' hnally gla- 

 brous or nearly so; 

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

 the miildlo one slightly lobcd: racemes slender, few-fid.: 

 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; harily at the Arnold Arboretum. 



32. rufinerve, Sieb. A: Zucc. Tree, to 40 ft., with striped 

 bark: branches glaucous when young: lvs. rounded at 

 the base, 3-!obed, 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. I:ti7. Var. albo-Iimbatum, Hook. Lvs. edged 

 with white. 15. M. 5793. 



33. pennsylvanicum, Linn. {A. slrialum, Dur.). 

 Strii'kd Maple. Moosewood. Tree, rarely 40 ft.: 

 bark greenish, striped with white lines: lvs. 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, 

 driKjping: 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. .5(3(5. ILT. 

 330. — Hand.some 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 Abgdta. 



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

 glabrous: lvs. ovate to oblong-ovate, 2-3}^^ in. long, 

 acuminate, truncate or rounded and usually 3-nerve(l 

 at the base, unequally incisely serrate or sometimes 

 slightly lobed, light green and pubescent beneath, 

 rarely nearly glabrou.s: staminate fis. in few-fid, sessile 

 racemra from lateral leafless bufls; stamens 4 or some- 

 times (>; disk lobed; pistillate fis. in elongated racemes, 

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

 strongly veinefl. ..^ent. anri. W. (^hina^JMhk 1 :!^5. — 

 Graceful, hardy tr^^eiy ,variay|^^^^^^^latum, 



Rehd. Lvs. distinctlv lobed, nearly glabrous. J. U.S. 

 29:352, 355. Var. betulifolium, Relid. {A.brlulifMiiun, 

 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, rovm<led and 3-nerved at the base, [mbeseent 

 beneath. Intro, as .4. sUiclii/ophi/Iliim, but the true 

 A. stachyiijihylluin is a Himalayan species, not in 

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

 at the biuse, ami 5-nerved, pubescent beneath. Var. 

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

 racemes to 6 in. long, slender. 



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

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

 rarely 7-lobed, 2-3' 2 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.: lvs. 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. 11.1:37. 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. Wicri hicinialiim, Hort^). Branches 

 pendulous: lvs. deeply cleft, with dissected lobes. — A 

 graceful variety, remarkable for its drooAig branches 

 and finely divided fo'Hage. M.D.G. 1903?|28 (habit). 

 Var. heterophyllum, r:\(var. helerophyllum taciniatum, 



eeply and unequally divided. 



Hort.). Upright: lvs 

 with narrow lobes. 

 Var. tripartitum. Pax. 

 Upright: lvs. 3-parted. 

 Var. lutescens, Spaeth. 

 Lvs. yellow, bronze- 

 colored when unfokl- 

 ing. Var. albo-varie- 

 gatum, Spaeth (var. 

 Juhlkci, Hort.). Lvs. 

 spotted with white or 

 rosy pink. 

 Var.crispum, 

 Schwerin. 

 Lvs. deeply -.^ 

 cut and ' 

 crimped. — 

 Linnicus evi- 

 dently sup- 

 posed this 

 species to be 

 the sugar 

 maple, and named it 

 the true sugar maple. 



37. rftbrum, Linn. Red 

 Fig. 97. Large tree, 120 



.^, 



Acer rubrum. — Red Maple. (Enlarged) 

 accordingly. He did not know 



Scarlet or Swamp Maple. 



ft.: lvs. 3-5-lobed, 3-4 in.- 

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

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

 yellowi-sh, petals 5: fr. glabrous. • E. N. Amer. S.S. 

 2:94. 10m. .:57. G.C. II. 1:173. H.T. 334.— Very val- 

 uable tree for s.-eet and park planting; attractive at 

 every .sea.son from i's excellent habit, earline.ss of the 

 scarlet fls., bright re,' frs. in late spring, and the 

 bRiuUful foliage, which i.rns bright scarlet or orange 

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



