ACER 



ACER 



201 



or slightly 5-lobed, coarsely serrate, pubescent beneath, 

 2}^-4^ in. long : racemes rather dense, long, upright: 

 fr with diverging wings, bright red in summer. E.N. 

 Amer. 8.8.2:82,83. H.T. 328. Valuable as under- 

 growth; Ivs. turn yellow and scarlet in fall. Var. lacini- 

 atum, Jouin. Lvs. deeply and irregularly lobed and 

 incised. 



20. caudatum, Wall. Large tree: Ivs. 5-, or some- 

 times 7-lobed, cordate, 3-5 in. long and about as broad, 

 brownish pubescent on the veins beneath ; lobes ovate, 

 long-acuminate, incisely serrate: panicle upright, 

 cylindric, with the peduncle 5-6 in. long: fr. small, in 

 upright panicles; wings spreading at right angles. 

 Himalayas. The type is not in cult., but the two fol- 

 lowing varieties are: Var. ukurunduense, Rehd. (A. 

 ukurunduense, Fisch. & Mey. A. spicalum var. ukurun- 

 duense, Maxim.). Small tree: branchlets and petioles 

 pubescent while young: Ivs. glabrous above, pubescent 

 beneath, sometimes only along the veins; lobes coarsely 

 serrate: panicle pubescent: wings of the fr. often nearly 

 upright: otherwise like the type. Japan, Manchuria. 

 S.T.S. 1:82. S.I.F.2:43. G.C. II. 15:172. Var. mul- 

 tiserratum, Rehd. (A.multiserratum, Maxim. A.erbsum, 

 Pax). Tree, to 30 ft.; very similar to the preceding 

 variety, but glabrous or nearly glabrous. W. China. 



21. macrophyllum, Pursh. LARGE-LEAVED MAPLE. 

 Tree, to 100 feet high: Ivs. cordate, deeply 3-5-lobed or 

 cleft, pubescent when young, pale green beneath, 8-12 

 in. across; middle lobe mostly 3-lobed: panicles gla- 

 brous, narrow, pendulous, 4-5 in. long: fr. with yel- 

 low, bristly hairs, wings spreading at right angles or 

 nearly upright, over 1 in. long. W. N. Amer. S.S. 

 2:86, 87. F.E. 14, pi. 44 (habit). Gn.M. 2:107 (habit). 

 Handsome round-headed tree, remarkable for its 

 large foliage; not hardy in the N. 



22. pseudoplatanus, Linn. SYCAMORE MAPLE. Tree, 

 70 ft. high: Ivs. 5-lobed, coarsely crenate-serrate, 3J^-7 

 in. across, deep green above, glaucous and mostly gla- 

 brous beneath: racemes pendulous: fr. glabrous. Eu., 

 Caucasus. Gt. 42:260, 261. H.W. 3:44, p. 39. F.S. 

 R. 3, p. 181. F.E. 15, pi. 47 (habit). Large tree of 

 vigorous growth, with large, spreading head; thrives 

 well even in exposed situations. Many varieties and 

 garden forms: Var. vill&sum, Presl. Lvs. chartaceous, 

 pubescent beneath. Var. erythrocarpum, Carr. Fr. 

 bright red: Ivs. smaller and more lustrous. R.H. 1864: 

 171. M.D. 1905:1. Gn. 76, p. 540. Var. purpurascens, 

 Pax (yars. purpiireum and atropurpiireum, Hort.). Lvs. 

 purplish red beneath; of robust growth. Var. Hand- 

 jeryi, Spaeth (var. Prim Handjery, Hort.). Lvs. pur- 

 plish beneath, bright red when unfolding. Var. W6r- 

 leei, Schwerin (var. lutescens, Hort.). Lvs. yellow. Var. 

 albo-variegatum, Kirchn. Lvs. with white blotches 

 and spots, reddish while young. Var. Leopoldii, Lem. 

 Similar to the preceding variety; bright rosy pink 

 while young. I.H. 1864:411. R.B. 1906:197. Var. 

 bicolor, Spaeth. Lvs. light green while young, with 

 yellow, finally whitish, spots. Var. tricolor, Kirchn. 

 Lvs. purplish while young, spotted with yellow. Var. 

 quadricolor, Schwerin (var. Simonii Pax, var. Simon- 

 Louis freres, Deegen). Lvs. with large, white spots and 

 also sprinkled with small dots; pink while young. Var. 

 nervosum, Schwerin. Habit pyramidal, of slow 

 growth: Ivs. marked with yellow between the veins 

 above, purplish beneath. 



23. Heldreichii, Orph. Tree: Ivs. 5-lobed, the mid- 

 dle lobe divided nearly to, the outer half way to the 

 base, 3-5 in. across, glabrous, dark green and shining 

 above, glaucous beneath; lobes coarsely and doubly 

 serrate: panicle erect, long-stalked, ovate. 8. E. Eu. 

 Gt. 34:1185. G.C. II. 16:141. Var. purpuratum, 

 Schwerin. Lvs. intensely red beneath. 



24. Trautvetteri, Medw. (A. velutinum, Hort., not 

 Boiss. A. insigne, Nichols., not Boiss. & Buhse). Lvs. 

 slightly cordate, deeply 5-lobed, 5-7 in. across, glau- 



cous beneath and pubescent when young; lobes coarsely 

 crenate-serrate, longer than broad: panicle erect, ovate. 

 Caucasus. Gt. 40, pp. 26^266. G.C. II. 16:75. B.M. 

 6697 (as A. insigne). Similar to A, insigne, but hardier, 

 with smaller Ivs. and smaller panicle. 



25. insigne, Boiss. & Buhse (A. Van Vdlxemi, Mast.). 

 Large tree: Ivs. 5-lobed, deeply cordate, 5-10 in. across, 

 bright green above, glaucous and at length glabrous 

 beneath ; lobes about as long as broad, coarsely crenate- 

 serrate: panicles large, erect. Caucasus, N. Persia. 

 G.C. II. 7:73; III. 10:9. Remarkable for its large, 

 handsome foliage; not hardy in the N. Var. velutinum, 

 Boiss. Lvs. densely pubescent beneath. G.C. III. 

 10:189. Var. W61fii, Schwerin. Lvs. red beneath. 



Section INTEGKIPOLIA. 



26. obl6ngum, Wall. Tree, to 50 ft: Ivs. coriaceous, 

 oblong, entire, long but bluntly acuminate, rounded and 

 3-nerved at the base, glabrous, reticulate and usually 

 glaucous beneath, 2-7 in. long: panicle short, pubes- 

 cent; fls. small, greenish: wings of fr. at right angles 

 or horizontally spreading. Himalayas, W. and Cent. 

 China. Jacquemont, Voy. Inde 4:34. Var. c6ncolor, 

 Pax. Lvs. green beneath. Not hardy in the northern 

 states. In young plants, the Ivs. are sometimes lobed 

 at the base. J.H.S. 29:95. Recently advertised as A. 

 discolor; the true A. discolor, Maxim., is not in cult. 



Section INDIVISA. 



27. carpiniffilium, Sieb. & Zucc. HORNBEAM MAPLE. 

 Tree, 30 ft.: Ivs. oblong-ovate, acuminate, sharply and 

 doubly serrate, 



nearly glabrous, 

 3-6 in. long: stami- 

 nate fls. apetalous, 

 in few-fld. racemes; 

 pistillate with pet- 

 als, in longer ra- 

 cemes. S.Z. 2:142. 

 G.C. II. 15:564. 

 Gt. 41, p. 174. 

 S.I.F. 1:69. J. 

 H.S, 29:75. G. 

 W.3: 615 Very 

 distinct, hardy 

 species; the Ivs. 

 are almost ex- 

 actly like those 

 of Carpi nus. 

 This is the only 

 species of this 

 section; the 

 other species 

 included here by 

 Pax have been 

 referred to other 

 sections, mostly 

 to the following (see Sargent, 

 Plantse Wilsonianse 1:92). 



Section MACRANTHA. 



28. Davidii, Franch. Tree, to ' 

 50 ft.: branchlets glabrous: lys. 

 ovate or oblong-ovate, 2J^-8 in. 



long, acuminate, subcordate or rounded at base, un- 

 equally crenate-serrate, green beneath and rufously 

 villous on the veins while young, finally glabrous or 

 nearly so: racemes slender, pendulous, glabrous: wings 

 of fr. spreading horizontally. Cent. China. S.T.S. 1:83. 

 J.H.S. 29:86, 90. Handsome tree; hardy at the Arnold 

 Arboretum, the Ivs. turning bright yellow or purple in 

 autumn. In young plants, the Ivs. are often lobed at 

 the base. 



29. laxiflfirum, Pax. Tree, to 50 ft.: Ivs. ovate- 

 oblong, with 2 or 4 short lobes near the base, 2)^-4 in. 



