198 



ACER 



ACER 



D. Omry and young fr. tomentose: 

 short stalked: lrs.-_ deeply B- 



lobeil 36. saccharinum 



DD. Orary ami young fr. glabrous: 

 fls. on long fHtlicels: lis. S-o- 



lohfd 37. rubrum 



BB. Scixils connate ami petals tfanting at 

 least in the staminate fis.: fis. on 

 long, pendulous, mostly hairy pedi- 

 cels. 

 C. Pistillate and staminate fls. corym- 

 bose, terminal and lateral: fr. 

 glabrous or villous. American 

 species. 

 D. Corymb sessile or nearly sessile. 

 E. Li'S. glaucous or pale beneath. 

 F. Lobes acuminate; Ivs. gla- 

 brous beneath at maturity. 38. saccharum 

 FF. Lobe^ obtuse; Ivs. pubescent 



beneath 39. floridanum 



EE. Lv8. green beneath; lobes acu- 

 minate. 

 F. Bark of trunk dark: hs. hir- 

 sute-pubescent, 6-6 in. 



across 40. nigrum 



FF. Bark jmIc: Ivs. soft-pubescent 



beneath, g-Syi in. across. .41. leucoderme 

 DD. Corytnbs short-stalked: Ivs. pu- 

 bescent benealh; lobes obtuse or 



acute 42. grandi- 



cc. Pistillate fls. racemose, with petals [dentatum 



arui distinct sepals, slamintite 

 corymbose, uith connate seiHils and 

 without petals, both from lateral 

 leafless buds. Japanese species. . .43. diabolicum 

 AA. Lvs. 3-o-foliolate: fls. dieecious. 



B. Fls. in terminal corymbs, after the lvs.: 

 winter-buds with several imbricate 

 scales: disk large, annular: lvs. S- 

 foliolate. 

 c. Petioles, lvs. beneath and corymbs 

 pilose; petioles short. 

 D. Shape of lvs. elliptie-ohlong, spar- 

 ingly serrate, 3-5 in. long . . . .44. nikoense 

 DD. Shape of lvs. elliptic, coarsely 



dentate, 1-3 in. long 45. griseum 



CC. Petioles, Irs. and corymbs glabrous; 

 lvs. oblong -lanceolate; petioles 



slender 46. mandshuri- 



BB. FU., at least the pistillate, in lateral, [cum 



long and slender racemes: winter- 

 buds with 2 valvate scales. 

 c. Petals present; fls. of both sexes in 

 racemes, sometimes leafy at base, 



with the lvs.: lvs. 3-foliolate 



D. Petioles and lvs. pubescent be- 

 neath: sepals and petals 5 47. Henryi 



DD. Petioles and lvs. glabrous at 



maturity: sepals and petals 4 . . 48. cissifolium 

 CC. Petals wanting; pistillate fls. in 

 pendulous racemes, staminate co- 

 rymbose, pendulous, both sexes 

 from lateral leafless tinds before 

 the Its.: lvs. S-5-foliolate 49. Negundo 



Section Campestria. 



1. monspessul^num, Linn. (A. Irilobalum, Lam.). 

 Shnib or snri.'ill tree, 2.5 ft.: lvs. S-lobed, coriaccoas, 1-3 

 in. across, shining above, glaucous and glabrou.s be- 

 neath; lobes entire or with few old use teeth: corymbs 

 erect: fr. with slightlv spreading wings. S. Eu., N. 

 Afr., W.Asia. Gt. 1893, p. :«{. ll.W. 3, p. 46. G.W.8, 

 p. 19.5 fhabit;.— Shrub orsinall tree of .slow growth, with 

 a den.se, rounded he;id and, in tern[)erate region.s, nearly 

 evergreen foliage, thriving well in dry situations. Var. 

 ibericum, Koch. (A. ih'frin/m, Bieb.j. Lvs. larger, the 

 inner lobes usually slightly 3-lobeil, obtu.se. 



2. campestre, F.inn. Shrub or tree, occasionally .50 

 ft., nith corky branches: lvs. 3-.5-lobed, 1)^^-3 '4 in. 

 long, green and pubescent beneath or nearly glabrous; 

 lobfs entire or the middle one slightly 3-lobed: 

 corvmbs erect, hairy: fr. with horizontally spreading 

 wings. Eu., W.Asia. H.W.3:46, p. 4.5. F.E. 20, pi. 108 



(habitl. Gt. 1.S03, p. 327. — Shrub or tree of moderate, 

 dense growth, with dull green foliage, valuable for 

 planting as undergrowth and on dry ground. Many 

 varieties and garden forms: Var. argenteo-variegitum, 

 Schwerin. Lvs. with large white blotches. Var. pul- 

 verulentum, Kirchn. Lvs. sprinkled with white. Var. 

 austriacum, DC. I'sually a tree: lvs. 5-lobed, with 

 acute, nearly entire lobes: fr. glabrous. V.E. 19, pi. 98 

 (habit). Var. taQricum, Kirchn. Shrub: lvs. 5-lobed; 

 small, lobes 3-lobed. Var. hebecarpum, DC. Fr. and 

 generally the Iv.s. pubescent beneath. 



3. Opalus, Mill. (A. Malum, Lauth). Small tree, 30 

 ft.: lvs. .5-lobed, 3-.5 in. long, glaucous beneath and at 

 length glabrous; lobes obtusely dentate, short and 

 broad, the middle ones often 3-lobed: corymbs some- 

 what drooping: fr. with slightly spreading wings. S. 

 Eu., Orient. W.D.B. 2:171. — A variable species, simi- 

 lar to a small-lvd. sycamore maple. Var. hyrcanum, 

 Pax (A. /ii/rni/Htw, Fisch.ifc Mey. A. taun'cMTO, Hort. A. 

 trilohatum, Hort., not Lam.). Petioles very slender, red, 

 2-4 in. long; segms. of the lvs. 3-lobed, longer than 

 broad, with straight margins. Gt. 1893, p. 361. 



Acer Mi7abei. 



(X,'-2) 



Section Platanoidea. 



4. Miyabei, Maxim. Fig. 91. Tree, to 40 ft.: 

 branches corky: lvs. .5-lobed, lobes lobulatc or coarsely 

 dentate, obtusely acuminate, with obtuse teeth, at first 

 pubescent on both sides, later only beneath, pale green 

 beneath, .5-6 in. long: corymbs long-stalked, 10-1.5-fld.. 

 pubescent: fr. pubescent with horizontally spreading 

 wings. Japan. G.F. 6:143 (adapted in Fig. 91). S.LF. 

 2:4.5. — Hand.some, vigorous tree, quite hardy at the 

 Arnold Arboretum. 



.5. platanoides, Linn. Norway Maple. Fig. 92. 

 Large tree, to 100 ft.: lvs. .5-lobed, cordate at base, 

 glabrous, liglit green and lustrous beneath, lobes 

 I)ointed, remotely dentate with pointed teeth: corymbs 

 glabrous; fls. yellowish green: fr. glabrous, with hori- 

 zontally spreading wings. Eu., Caucasus. H.W. 3:45. 

 Pax 49. Gt. 42, p. .561, .584, .5.S.5.— Large, handsome tree, 

 with roimd, spreading head, resembling somewhat ^4. 

 saerltarum. The lvs. turn pale yellow in autumn. Many 

 garden forms, .some of which are here arranged in two 

 groups, the first being rejnarkable for the manner in 

 which the lvs. are cut and for the Tiabit; the second 

 bei.ig chiefly remarkal)le for their coloring: 



(1) Var. cucuUatum, Nichols. Lvs. irregularly and 



8 lortly lobed, crimped, light green. Var. dissectum, 



