ACER 



19. Psetido-piatanns, Linn. Stoamoeb Maple. Tree, 

 70 ft. high: Ivs. 5-Iobed, coarsely crenate-serrate, 3K-7 

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

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

 ■Caucasus.— Large tree of vigorous growth, with large, 

 spreading head; thrives well even in exposed situations. 

 Many varieties and garden forms : 



Var. viUdsum, Prsl. Lvs. charta- 

 ceous, pubescent beneath. Var. 

 purpurascens, Pax. (vars. piirpu- 

 7-euni and alropiirpureum, Hort.). 

 Lvs. purplish red beneath ; of ro- 

 bust growth. "Var.Handi6ryi,Spath. 

 (var.PHm.s Sand jery, Hort.). Lvs. 

 purplish beneath, bright red when 

 unfolding. Var. WSrleei, Hort. (var. 

 httiscens, Hort. ) . Lvs. yellow. Var. 

 Alho-variegitum, Hort. Lvs. with 

 white blotches and spots. Var. tri- 

 color, Hort. Lvs. spotted with red, 

 changing to white. 



20. HSldreicM, Orph. Tree; lvs. 

 5-lobed, the middle incisions reach- 

 ing 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. S. E. Eu. Gt. 

 34:1185. G.C.n. 10:141. 



21. Tratitvetteri, Medw. (A. velutinum, Hort., not 

 Boiss.). Lvs. slightly cordate, deeply 5-lobed, 5-7 in. 

 across, glaucous beneath and pubescent when young ; 

 lobes coarsely crenate-serrate : panicle erect, ovate. Cau- 

 casus. Gt. 40, pp. 264-266. B.M. 6697.- Similar to ^. 

 insigne, but hardier and with smaller leaves. 



22. insigne, Boiss. & Buhse. Large tree; lvs. 5-lobed, 

 deeply cordate, 5-10 in. across, bright green above, glau- 

 cous beneath ; lobes broad, coarsely crenate-serrate : 

 panicles large, erect. Caucasus, N. Persia. G.C. HI. 

 10: 189.— Remarkable for its large, handsome foliage; 

 not hardy in the North. May be divided into two varie- 

 ties: Var. Van Vdlxemi, Pax. (A. Van Volxemi, Mast.). 

 Lvs. at length glabrous beneath. Var. velitinum, Boiss. 

 Lvs. densely pubescent beneath. 



DD. Lvs. Tnosfhj S-lobed or without lobes, green beneath. 



23. Tatdricum, Linn. Shrub or small tree, 20 ft. : lvs. 

 roundish oval or oblong, cordate, sometimes slightly 

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

 in long peduncled panicles, white. S. E. Eu., Orient. 

 —Round-headed small tree, growing best in somewhat 

 moist soil. 



24. 6innd.la, Mas. (A. Tatdricum, var. Ginndla, 

 Hort.). Fig. 21. Shrub or small tree, 20 ft. : lvs. 3-lobed, 

 lX-3Kin. long glabrous, the terminal lobe elongated, 

 doubly serrate : fls. in long peduncled panicles, yel- 

 lowish, fragrant. Manchuria, N. China, Japan. Gt. 

 1877: 308. — 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. 

 Var. Semendvi, Pax. (A. Semenbvi, Begel. ). Shrub: 

 lvs. smaller, deeply 3- or nearly 5-lobed. Turkestan. 



25. spicS.tiim, Lam. Mountain Maple. Shrub or 

 small tree, rarely 30 ft. : lvs. 3- or slightly 5-lobed, 

 coarsely serrate, pubescent beneath, 2K— IK in. long: 

 racemes rather dense, long, upright: fr. with diverging 

 wings, bright red in summer. E. N. Am. S.S. 2: 82, 83. 

 — Valuable as undergrowth; lvs. turn yellow and scarlet 

 in fall. 



26. ruHnfirve, S. & Z. Tree with striped bark : 

 branches glaucous when young : lvs. rounded at the 

 base, 3-lobed, 3-5 in. long, doubly serrate, ferrugine- 

 ously pubescent beneath when young : racemes ferru- 

 gineously pubescent. Japan. S.Z. 2:148. Var. dlho-lim- 

 b^tum, Hook. Lvs. edged with white. B.M. 5793. 



27. Pennsylv4nicum,Linn.(J-.sfriiiiMm,Dur). Striped 

 Maple. Moosewood. Tree, rarely 40 ft. : bark greenish, 

 striped with white lines: lvs. slightly cordate, roundish- 

 obovate, 3-lobed at the apex, 6-8 in. long, finely serrate, 

 f errugineously pubescent beneath when young : racemes 



ACER 



15 



glabrous, drooping. E. N. Amer. S.S. 2 :84, 85. Michx. 

 Hist. Arb. 2:17. Em. 566.— Handsome medium-sized 

 tree of upright, dense habit, with bright green, large 

 foliage, turning clear yellow in autumn, and attractive 

 even in winter from its smooth, greenish bark, striped 

 with white. 



18. Black Suear Maple. — Acer nig^rum, 



DDD. Lvs, not lohedjpenninerved, doubly serrate, 

 acuminate. 



28. oarpinifdlium, S. & Z. Hornbeam Maple. Tree, 

 30 ft. : lvs. oblong-ovate, acuminate, sharply and doubly 

 serrate, nearly glabrous, 3-6 in. long : raceme few-fld. 

 S.Z. 2:142. G.C. II. 15:564.-Very distinct, hardy spe- 

 cies; the lvs. are almost exactly like those of Carpinus. 



AA. Foliage of SS-foliolate lvs. {cf.Ifo.l4): fls. 

 dioecious. 

 E. Petioles and young branches with a r^ifous, villous 

 tontentum: fls. in terminal few-flowered racemes: 

 winter-buds with many scales. 



29. Nikotose, Max. Tree, 40 ft. : leaflets ovate or ob- 

 ovate, acute, entire or coarsely serrate, 2-5 in. long, 

 villous-pubescent beneath: fr. hairy, with large wings. 

 Japan. G.P. 6: 185.— Very distinct; lvs. turning bril- 

 liant scarlet in autumn. 



19, Acer platanoides. 



BB. Petioles and branches smooth or velvety pubescent: 



fls. in long lateral racemes: winter-bads with 2 



or 4 outer scales. 



30. cissiSdliiiin, Koch. (NegHndo cissifblium, S. & Z.). 



Small tree: leaflets 3, long-stalked, ovate or elliptic, 



cuneate, coarsely serrate, ciliate, 2%-i in. long; fls. in 



