200 



ACER 



N. Amer. S.S. 2:87. Handsome, round-headed tree 

 or shrub, beautiful with its delicate light green foliage, 

 red fls., rose-colored fr., and its orange and scarlet fall 

 coloring. 



13. palmatum, Thunb. (A. polymorphum, Sieb. & 

 Zucc.). JAPAN MAPLE. Shrub or small tree, 20 ft. branch- 

 lets, petioles and peduncles glabrous: Ivs. 5-9-lobed or 

 divided, 2-4 in. across, glabrous, lobes oblong, acumi- 

 nate, doubly serrate or incised: corymbs few-fld., gla- 

 brous, erect, with small purple fls.: fr. small, glabrous; 

 the wings spreading at an obtuse angle. Japan. S.Z. 

 1:145, 146. S.I.F. 1:68. F.E. 19, pi. 92 (habit) . A.F. 



94. Acer japonicum. 



12:11. J.H.S. 29:340 This species and A. japonicum 

 are known as Japanese maples. They are extremely 

 handsome shrubs of dense though graceful habit, and 

 with elegant foliage, beautiful especially in spring for 

 its delicate shades of green and red, and again in 

 autumn, when the Ivs. assume the most striking tints. 

 Some of the more vigorous-growing varieties, like 

 atropurpureum, disseclum, ornatum, and the typical 

 forms, are hardy even in New England, while most 

 of the variegated forms are more tender. They grow best 

 in partly shaded situations and in well-drained, rich soil. 

 There are many varieties, mostly intro. from Japan- 

 ese gardens, of which the following are some of the 

 best. They may be divided into 5 groups, represent- 

 ing various degrees of dissection of the Ivs. : 



(1) A. palmatum var. Thunbergii, Pax (A. palma- 

 tum, Thunb.). Fig. 93, e. Lvs. deeply 5-9-lobed or 

 cleft; lobes oblong-lanceolate, coarsely and doubly 

 serrate or incised. Var. atropurp&reum, Van Houtte 

 (var. n\grum, Hort.). Fig. 93, c. Lvs. dark purple, 

 coarsely doubly serrate. F.S. 12:1273. J.H.S. 29:342. 

 F.E. 14, pi. 42, 32 : 767 (habit). Var. sanguineum, Carr., 

 is lighter red than var. atropurpureum. I.H. 14:526. 

 Var. bicolor, Koch (var. atropurpureum variegatum, 

 Hort.). Lvs. dark purple, with large carmine 

 blotches, the lobes half purple and half carmine. Var. 

 aureum, Nichols. Lvs. yellow. Var. versicolor, 

 Schwerin (A. polymorphum septemlobum versicolorum, 

 Van Houtte). Lvs. bright green, with large white 

 spots. F.S. 14:1498. Var. rdseo-marginatum, 

 Schwerin (A. polymorphum rbseum margindtum, 

 Pynaert). Lvs. small, deeply cut, with narrow pink 

 margin. F.S. 15:1566. I.H. 28:430. Var. crispum, 

 Andrd. Lvs. small, with involute margins; of dis- 

 tinctly upright growth. I.H. 17:43. 



(2) Var. septemlobum, Koch (A. septemlobum, 

 Thunb.). Lvs. mostly 7-lobed; lobes broad, equally 

 doubly serrate. Gt. 42, p. 680. J.H.S. 29:345. Var. 

 rubrum, Schwerin. Lvs. large, deep red when young, 

 becoming almost green later. Var. reticulatum, AndriS. 

 Fig. 93, a. Lvs. greenish yellow, with green margin 

 and dark green veins. I.H. 17:18. Var. tricolor, 

 Nichols. Lvs. with red, pink and white spots. 



(3) Var. linearilobum, Sieb. & Zucc. (yar. scolopen- 

 drifblium, Hort., not Schwerin). Lvs. divided nearly 

 to the base; lobes linear, remotely serrate or nearly 



ACER 



entire. Gt. 42, p. 681. Var. atrolineare, Schwerin 

 (var. linearilobum alropiir pureum, Nichols. ; var. pin- 

 natifdlium alropur pureum, Hort.). Lvs. dark red. 



(4) Var. dissectum, Koch (A. polymorphum var. 

 decompdsitum, Sieb. & Zucc. A. polymorphum palma- 

 tifidum, Van Houtte). Fig. 93, /. Lvs. divided to the 

 base in 5-9 pinnatifid lobes. S.Z. 1:146 F 821 '2156 

 J.H.S. 29:346. M.D.G. 1902:209. F.W. 1875: GXX 

 III. 31:46 (suppl.). Var. ornatiun, Carr. (var. dissec- 

 tum atropurpureum, Hort.). Fig. 93, d. Lvs. deeply 

 cut,deepred. I.H.17:46. R.H. 1867:391. F.E.,pl.49 

 (habit) . Var. Frederici-Guilelmi, Carr. (var. pinnatifi- 

 dum rbseo-piclum, Lem.). Lvs. finely cut, green, with 

 white and pink spots. I.H. 14:523. R.H. 1867:391. 



(5) Var. sessilifdlium, Maxim. Lvs. deeply cut, 

 with very short petioles. G.C. II. 16. Of little 

 decorative value. 



14. Sieboldianum, Miq. (A. japdnicum var. Sie- 

 &oWidmm,Franch.&Sav.). Small tree or shrub : branch- 

 lets, petioles and peduncles pubescent when young: 

 Ivs. 7-9-lobed, cordate or nearly truncate at the base, 

 2-3J/6 in. across, glabrous except on the veins beneath; 

 lobes ovate-oblong, acuminate, sharply serrate: corymbs 

 long-peduncled, nodding; fls. yellowish, small: fr. 

 small, glabrous or slightly pubescent, the wings spread- 

 ing at an obtuse angle. Japan. S.I.F. 2:45. Var. 

 microphyllum, Maxim. Lvs. smaller, 1^-2 % in. 

 across. S.I.F. 2:42. This species is hardy at the 

 Arnold Arboretum; it is similar to A. palmatum, but 

 somewhat coarser. 



15. jap6nicum, Thunb. Figs. 93, 6, and 94. Small 

 tree or shrub: branchlets, petioles and peduncles pubes- 

 cent when young: Ivs. 7-11-lobed, cordate, 3-6 in. 

 across, light green, with silky hairs when unfolding; 

 lobes ovate, doubly serrate: corymbs few-fld., pendu- 

 lous; fls. large, purple: fr. finally glabrous; wings 

 spreading at an obtuse angle. Japan. S.Z. 1:144. 

 S.I.F. 1:66. Var. macrophyllum, Schwerin. Lvs. large, 

 light green. Var. aureum, Schwerin. Lvs. yellow. Var. 

 Parsonsii, Veitch (var. filicifdlium, Hort.; var. lacinid- 

 tum, Hort.). Lvs. large, divided nearly to the base in 

 9-11 pinnatisect segms. J.H.S. 29:334. R.B. 32:197. 



Section SPICATA. 



16. Oliverianum, Pax. Tree, to 30 ft.: branchlets 

 glabrous: Ivs. 5-lobed, truncate or subcordate at the 

 base, glabrous, finely reticulate and lustrous beneath, 

 2>^-4 in. across; lobes broad, ovate, long-acuminate, 

 finely serrate: panicles nearly corymbose, long-pe- 

 duncled, glabrous; fls. whitish, small: wings of fr. spread- 

 ing nearly horizontally; wing with nutlet about 1 in. 

 long. W. China. S.T.S. 1:77. A graceful maple, 

 resembling A. palmatum, but larger. In young plants, 

 the Ivs. are often deeply cut with narrow, elongated 

 lobes. J.H.S. 29:356, 359 (as Acer sp.). 



17. tat&ricum, Linn. Shrub or small tree, 20 ft. : Ivs. 

 roundish oval or oblong, cordate, sometimes slightly 

 lobed, 2-4 in. long, doubly serrate, nearly glabrous: fls. 

 in long-peduncled panicles, white: wings of fr. nearly 

 upright or slightly spreading, bright red in summer. 

 S.E. Eu., Orient. H.W. 3, p. 43. Round-headed small 

 tree, growing best in somewhat moist soil. 



18. ginnala, Maxim. (A. taturicum var. ginnala, 

 Maxim.). Fig. 95. Shrub or small tree, 20 ft.: Ivs. 

 3-lobed, l%-3}4 in. long, glabrous, the terminal lobe 

 elongated, doubly serrate: fls. in long-peduncled pani- 

 cles, yellowish, fragrant. Manchuria, N. China, Japan. 

 Gt. 1877:308. S.I.F. 2:44. F.E. 17, pi. 72 (habit). 

 Var. Semendwii, Pax (A. Semenbwii, Regel & Herd.). 

 Shrub : Ivs. smaller, deeply 3- or nearly 5-lobed. Turkes- 

 tan. Graceful shrub, with handsome foliage, turn- 

 ing bright red in autumn; may be used as a substitute 

 for the Japanese maples where these are not hardy. 



19. spicatum, Lam. (A. montanum, Ait.). MOUN- 

 TAIN MAPLE. Shrub or small tree, rarely 30 ft.: Ivs. 3-, 



