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Acer negundo, Linn. (Negundo fraxinifolium. Nutt. N. aceroides, Moench. Rulac Negundo, Hitchc.). Ash-leaved Maple. Box Elder. Fig. 101. Large tree, 70 ft.: lvs. pinnate; lfts. 3-5, ovate or oblong-lanceolate, coarsely serrate or 3-lobed, mostly glabrous, 2-5 in. long: fls. before the lvs.; staminate fls. in pendulous corymbs, pistillate fls. in pendulous racemes. E. N. Amer. S.S. 2:96. Michx. Hist. Arb. 2:18. H.T. 336.— Large, rapid-growing tree of spreading habit, thriving best in moist and rich soil. Much prized in the W., where it withstands cold and dryness. Largely used for shelter-belts and for planting timber-claims. Var. californicum, Sarg. (A. californicum, Dietr. Negundo californicum, Torr. & Gray). Branches pubescent when young: lfts. 3, of firmer texture, densely pubescent beneath: fr. not constricted at the base. W. N. Amor. S.S. 2:97. Nutt. N. Amer. Sylv. 2:72. Var. pseudo-californicum, Schwerin (A. californicum, Hort. A. Negundo var. californicum, Kirchn.). Branches green, bloomy; of vigorous growth. Var. violaceum, Kirchn. (A. californicum, Hort.). A vigorously growing form: branches purplish with glaucous bloom or finely pubescent when young. Var. argenteo-variegatum, Bonamy. Lvs. with broad white margin. Probably the most effective of all variegated hardy trees. F.S. 17:1781. Gn. 68, p. 402 (habit). G. 2:37; 11:97 (habit). Var. aureo-variegatum, Booth (var. aureo-maculatum, Schwerin). Lvs. spotted with yellow. Var. aureo-marginatum, Dieck. Lvs. with yellow margin. Var. auratum, Spaeth (var. californicum aureum, Hort.). Lvs. yellow. R.B. 1906:197. Var. crispum, G. Don. Lfts. curled. These horticultural varieties may be grafted on common box elder seedlings. Box elder also grows from hardwood cuttings, like the grape. Two new forms have been recently described as new species by Britton: A. interior, distributed from Alberta and Mont, to Ariz, and New Mex. (B.T. 655), and A. Klngii (B.T. 656), from Utah; they are closely allied to var. californicum, but differ in their glabrous foliage; in the first the wings of the samara are adnate to the nutlet only to or above the middle; in the second the wings reach the point of union of the nutlets.
A. acuminatum, Wall. (A. caudatum, Brandis, not Wall. A. sterculiaceum, Koch, not Wall.). Allied to A. argutum. Tree: lvs. 3-lobed. 3-4 1/2 in. long, glabrous and light green beneath; lobes long-acuminate, and doubly serrate: wings of (r. spreading at a right angle. Himalayas. G.C. II. 15:364 (as A. caudatum). Tender at the Arnold Arboretum.—A. ambiguum, Dippel. Allied to A. pictum. Lvs. pilose beneath: fls. and fr. unknown. Doubtful species of unknown origin.—A. amplum, Rehd. Allied to A. longipes. Tree, to 35 ft.: lvs. 5-lobed, 4-7 in. broad, glabrous: corymb nearly sessile, 5-6 in. across. Cent. China.—A. barbinerve, Maxim. Allied to A. argutum. Shrubby tree: lvs. 5-lobed, coarsely serrate: pistillate racemes usually 7-fld.: fr. larger. Manchuria. S.T.S. 1:86.— A. Boacii, Spach. Probably hybrid. A. monspessulanum X tataricum.—A. brevilobum, Hesse=A. parviflorum.—A. caesium, Wall. Allied to A. insigne. Tree: lvs. 5-lobed, glabrous, whitish beneath, 6-8 in. across; lobes acuminate, obtusely crenulate-serrate. Himalayas, Not hardy N.—A. capillipes, Alaxim. Allied to A. rufinerve. Tree, to 30 ft.: lvs. 3-lobed, glabrous beneath, red when unfolding, 3 1/2-5 in. long: fls. on slender stalks about 1/2in. long. Japan. S.T.S. 1:16. Not perfectly hardy at the Arnold Arboretum.—A. caudatum, Brandis=A. acuminatum.—A. cinerasens, Boiss. Shrub or amall tree: lvs. 3-lobed, 1/2-2 in. long. Similar to A. monspessulanum. Persia.—A. coriaceum, Tsch. (A. creticum, Tratt. A. polymorphum, Spuch). Probably A. creticum x pseudoplatanus.—A. crassipes, Pax. Supposed to be a hybrid between A. obtusatum and A. pcnnsylvanicum.—A. crasssipes. Hesse=A. parviflorum.—A. creticum, Linn.=A. orientale.—A. creticum, Tratt.=A. coriaceum.—A. Dieckii, Pax (A. platanoides yar. integrilobum, Zabel). Similar to A. platanoides. but lobes entire; probably A. Lobelii X platanoides.—A. distylum, Sieb. & Zucc. Allied to A. oblongum. Tree: lvs. ovate, 5-7 in. long, cordate, crenately serrate, light green and lustrous beneath. Japan, G.C. II. 15:499. S.I.F. 2:41. J.H.S. 29:76.—A. Durettii, Pax. Probably A. monspessulanum X pseudoplatanus.—A. erianthum, Schwerin. Allied to A. caudatum. Small tree: lvs. 5-lobed, 2-3 1/2 in. long, lobes broad, unequally and .simply serrate, nearly glabrous beneath: fls. with densely villous disk. W.China. S.T.S. 1:80.— A. Fargesi, Franch. (A. laevigatum var. Fargesii, Veitch). Allied to A. oblongum. Tree, to 30 ft.: lvs. coriaceous, lanceolate-oblong, 2-3 1/2 in. long, narrowed at the base, penninerved, glabrous, light green beneath, not reticulate. VV. China. J.H.S. 29:91.— A. flabellatum, Rehd. Allied to A. Oliverianum. Tree, to 30 ft.: lvs. 7-lobed, deeply cordate, 3-5 in. across, light green beneath and villous along the veins. Cent. China. S.T.S. 1:81.—A. Franchetii, Pax. Tree, to 15 ft.: lvs. globed; slightly pubescent beneath or glabrous at maturity and light green, ,3-4 in. long; lobes broadly ovate, acute, remotely toothed: fls. in short pubescent racemes from lateral leafless buds, with the lvs.: fr. with the wings spreading at right angles or less, nutlets thick, hairy: winter-buda with numerous imbricate scales. Cent. China. S.T.S. 1:87. Belongs to the section Lithocarpa.—A. fulvescens, Rehd. Allied to A. pictum. Tree, to 60 ft.: lvs. usually 3-lobed, 2-4 in. across, beneath covered with a yellowish or fulvous pubescence. W. China. Hardy at the Arnold Arboretum,—A. heterophyllum, Willd.=A. orientate.—A. Hookeri, Miq. Allied to A. Davidii. Tree, 60 ft.: lvs. cordate-oblong, serrate, 4-6 in. long, quite glabrous beneath. Himalayas.—A. hybridum, Spach. Probably A. italum X pseudoplatanus.—A. hjjbridum, Baudr.=A. Boscii.—A. laevigatum. Wall. Allied to A. oblongum. Small tree: lvs. oblong, nearly entire, attenuate at the base, penninerved, green beneath. Himalayas, China.—A. laevigatum, Hort. =A. acuminatum. — A. Lobelii, Ten. Allied to A. cappadocicum. Branches glaucous: lvs. rounded at the base; lobes mostly undulated, abruptly pointed. Italy.—A. Maximowiczii, Pax (A. urophyllum, Maxim.), Allied to A. Tschonoskii. Small tree: lvs. 3—5-lobed, doubly serrate, the middle lobe much elongated, long-acuminate, glaucescent beneath, glabrous, 2-3 in. long: fr. slender-stalked; wings spreading at an obtuse angle. Cent, China. S.T.S. 1:84.— A. Mayrii. Schwerin. Allied to A. cappadocicum and A. amplum. Tree with smooth bark: Iva. usually 3-lobed, glabrous, 3 in. across; lobes very broad, long-acuminate: wings of fr. upright, incurved. Japan.—A. mexicanum, Pax (Negundo maxicanum, DC. A. serratum. Pax). Allied to A. Negundo. Lfts. 3, pubescent beneath, densely serrate: fr. glabrous; wings spreading at an acute angle. Mex.—A. micranthum, Sieb. & Zucc. Allied to A. Tschonoskii. Shrub or small tree: lvs. 5-7-lobed; lobes inciaed and doubly serrate, glabrous: fls. and fr. small. S.Z. 1:141. S.I.F. 2:44.—A. neapolitanum, Ten.=A. obtusatum.—A. neglectum, Lange (A. zoeschense, Pax). Probably A. campestre X Lobelii. Var. Annae Schwerin. Young lvs. deep red, later olive-green. M.D. 1908:1.—A. obtusatum, Waldst. & Kit. (A. neapolitanum. Ten.). Allied to A. Opalus. Small tree or shrub: lvs. 5-lobed, pubescent beneath, about 4 in. across; lobes broad, often rounded, obtusely denticulate: wings of fr. spreading at a right angle or less. S. Eu., N. Afr. H.W. 3, p. 47. Tender at the Arnold Arboretum.—A. orientale. Linn. (A. creticum, Linn. A. sempervirens, Linn. A. heterophyllum, Willd.). Allied to A. monspessulanum. Shrub, 4 ft.: lvs. nearly evergreen, short-stalked, orbicular or oval, entire or 3-lobed, 1/2-1 l/2 in. long, glabrous. Orient.—A. parviflorum, Franch. & Sav. (A. crassipes, Hesse, not Pax. A. brevilobum, Hesse). Allied to A. caudatum. Tree: lvs. 3-5-lobed, pubescent beneath, 4-6 in. across; lobes broadly ovate, acute, doubly serrate: wings of fr. spreading at an obtuse angle. Japan. S.I.F. 2:42. Not quite hardy at the Arnold Arboretum.— A. pectinatum. Wall. Allied to A. pennsylvanicum. Tree: lvs. 3-lobed, setosely serrulate, 2 1/2-3 1/2 in. across, the middle lobe elongated, acuminate. Himalayas. G.C. II. 15:365.—A. Peronai, Schwerin. Supposed hybrid of A. Opalus x monspessulanum. Originated at Vallombrosa near Florence.—A. robustum. Pax. Allied to A. palmatum. Small tree: lvs. 7-9-lobed, cordate, 3-4 in. across, glabrous beneath except the tufts of hairs in the axils of the veins; lobes ovate, acuminate, sharply serrate: wings of fr. nearly horizontally spreading. Cent. China.—A. rotundilobum, Schwerin (A. barbatum, Booth, not Michx.). Possibly A. obtusatum X monspessulanum.—A. Schwerinii, Pax. Affinity doubtful. Lvs. coriaceous, ovate-oblong, cordate, undivided or 3-lobed, glaucous beneath, soon glabrous, 5-7 in. long: Ss. and fr. unknown. Probably from the Himalayas. Var. marmoratum, Schwerin, has the lvs. variegated with light green. Var. monophyllum, Schwerin, has the lvs. 2-3 1/2in. long,—A. sempermvirens, Linn.=A. orientate.— A. serratum, Pax=A. mexicanum.—A. sikkimense. Miq. Allied to A. Davidii. Tree: lvs. cordate-ovate, coriaceous, long-acuminate, quite glabrous, entire or serrulate, 4-7 in, long: wings of fr. spreading at a right angle. Himalayas.—A. sinense. Pax. Allied to A. Oliverianum. Tree: lvs. 5-lobed, cordate or sometimes truncate, glaucescent beneath, glabrous, 3-6 in. long; lobes ovate, acuminate, sparingly appressed-serrate: panicle elongated: wings of fr. spreading horizontally. Cent. China. S.T.S. 1:78. J.H.S. 29:92.—A. sterculiaceum. Wall. (A. villosum. Wall.) Allied to A. Franchetii. Tall tree: lvs. 3-5-lobed, cordate, 6-8 in. across, tomentose below, coarsely serrate: racemes from lateral leafless buds: fr. in long pendulous racemes, often branched at the base; wings of fr. nearly upright. Himalayas.—A. sutchuenense. Franch. (A. sutchuense. Pax). Allied to A. mandshuricum. Small tree: lfts. 3, oblong-lanceolate, unequally serrate, glaucous beneath, 1 3/4-3 in. long: corymb many-fld., rather dense. Cent. China. S.T.S. 2:112.—Probably not in cult.; the plant figured by Veitch under this name is A. Henryi.—A. tegmentosum, Maxim. Allied to A. pennsylvanicum. Lvs. 3-4 in. long, glabrous beneath; lobes short: fla. small. Manchuria. G.C. II. 15:75.—A. trifidum, Hook. & Arn. Allied to A. tataricum. Small tree: lvs. coriaceous, cuneate-obovate, 3-lobed, glaucous beneath, glabrous, 2-3 in. long: lobes entire. China, Japan. S.Z.2:143.—A. urophyllum, Maxim.=A. Maximowiczii.—A. Veitchii, Schwerin. Possibly A, crataegifolium x rufinerye.—A. villosum, Wall.=A. sterculiaceum. —A. Wilsonii, Rehd. Allied to A. Oliverianum. Tree: lvs. 3-lobed, light green beneath, glabrous, 3 1/2-4 in. across; lobes ovate to oblong-ovate, acuminate, entire, or sparingly serrate: panicle elongated: wings of the fr. spreading at a right angle. Cent. China. S.T.S. 1:79.—A. zaechense, Pax=A. neglectum. Alfred Rehder.
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