Read about Acer palmatum in the Standard Cyclopedia of Horticulture
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Acer palmatum, Thunb. (A. polymorphum, Sieb. & Zucc.). Japan Maple. Shrub or small tree, 20 ft.: branchlets, petioles and peduncles glabrous: lvs. 5-9-lobed or divided, 2-4 in. across, glabrous, lobes oblong, acuminate, doubly serrate or incised: corymbs few-flo., glabrous, 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.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 lvs. assume the most striking tints. Some of the more vigorous-growing varieties, like atropurpureum, dissectum, 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 Japanese gardens, of which the following are some of the best. They may be divided into 5 groups, representing various degrees of dissection of the lvs.: (1) A. palmatum var. Thunbergii, Pax (A. palmatum, Thunb.). Fig. 93, e. Lvs. deeply 5-9-lobed or cleft; lobes oblong-lanceolate, coarsely and doubly serrate or incised. Var. atropurpureum, Van Houtte (var. nigrum, Hort.). Fig. 93, c. Lvs. dark purple, coarsely doubly serrate. F.S. 12:1273. J.H.S. 29:342. F.E. 14, pl. 42,32:767 (habit). Vur. 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. roseo-marginatum, Schwerin (A. polymorphum roseum marginatum, Pynaert). Lvs. small, deeply cut, with narrow pink margin. F.S. 15:1566. I.H. 28:430. Var. crispum, Andre. Lvs. small, with involute margins; of distinctly 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, Andre. 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. (var. scolopendrifolium, Hort., not Schwerin). Lvs. divided nearly to the base; lobes linear, remotely serrate or nearly entire. Gt. 42, p. 681. Var. atrolineare, Schwerin (var. linearilobum atropurpureum, Nichols.; var. pinnatifolium atropurpureum, Hort.). Lvs. dark red. (4) Var. dissectum, Koch (A. polymorphum var. decompositum, Sieb. & Zucc. A. polymorphum palmatifidum, Van Houtte). Fig. 93, f. Lvs. divided to the base in 5-9 pinnatifid lobes. S.Z. 1:146. F.S. 21:2156. J.H.S. 29:346. M.D.G. 1902:209. F.W. 1875: G.C. III. 31:46 (suppl.). Var. ornatum, Carr. (var. dissectum atropurpureum, Hort.). Fig. 93, d. Lvs. deeply cut deep red. I.H.17:46. R.H.1867:391. F.E.,pl.49 (habit). Var. Frederici-Guilelmi, Carr. (var. pinnatifidum roseo-pictum, Lem.). Lvs. finely cut, green, with white and pink spots. I.H. 14:523. R.H. 1867:391. (5) Var. sessilifolium, Maxim. Lvs. deeply cut, with very short petioles. G.C. II. 16.—Of little decorative value.
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