196 



ACER 



ACER 



%•. 



sotxls, wliich soon lose thoir si'rniiiiating power and 

 must bo sown soon after maturitx or stratified and 

 sown in spring; .1. sncchnrum and .1. \cijiimlo kvvp 

 thoir gerniinatinp power soniowhat longer. The early- 

 ripening sjiecies, like .1. saccharinuin and .1. rubnim, 



must be sown 

 as soon as tliey 

 ^ are ripe and 



they will geniii- 

 nate the same 

 year. A. cam- 

 pestre, A. mons- 

 pessulanum and 

 other speeics of 

 this group do 

 not usually ger- 

 minate until the 

 second year. 

 The varieties, 

 and rare species 

 may be budded 

 in summer on 

 the typical 

 forms or on spe- 

 cies of the same 

 group; kinds be- 

 longing to differ- 

 ent groups can- 

 not, as a rule, be 

 grafted on each 

 other; e.g., va- 

 rieties of A. platanoides will not grow on A. pseudo- 

 plntanus and vice versa, but .4. insigne will grow on 

 A. pseudnplntaixus, as they belong to the same group. 

 Some slirubby species, as A. pnlmatum, also A. cisni- 

 folium, A. ginnala var. Semeiiowi, and A. latum var. 

 rubrum, may be propagated by layers or half-ripened 

 greenwood cuttings in summer, or, still better, by 

 cuttings taken from forced plants in early spring in 

 the greenhouse. A. Negundo grows also from hard- 

 wood cuttings. P^ancy maples are readily winter-grafted 

 by the veneer method, the stocks being grown in pots. 

 The Japanese kinds are usually worked on imported 

 stocks of A. palmatum. 



.-iy-xr.- 



^...^^■y^ 



89. A pasture maple in autumn, showing 

 the strong framework. 



INDEX. 



13, 



albo-limbatum, 32, atropurpureum, 

 aibo-variegatum. 5. 22. 



22. 36. auratum, 49. 



argenteo-varipgatum, aureo-maculatum^ 49. 



2, 24. 49. aureo-marginatum, 

 argutum, 3.5. 5, 49. 



atrolineare, 13. aureo-variegatum, 49. 



^^5i^l^--,^j 



fe^ 



90 Pasture tree of Acer saccharum, sugar 

 maple. Tree natter-topped than usual. 



aureum. 8, 13, 15. 

 uuHtriacurn. 2. 

 barhntum. 38, 39. 

 bctulifolium, 34. 

 bicolor, 13. 22. 

 californicum, 49. 

 campestre, 2. 

 cappadocicum, 8. 

 carpinifoliuni, 27. 

 catalpifoliuni, 10. 

 caudatum, 20. 

 circinatum, 12. 

 cissifolium, 48. 

 colchicum, S. 

 columnare, 5, 37 

 concolor, 26. 

 cratagifolium, 30. 

 cri.spum, 13, 36, 49. 

 cucullatum, 5. 

 dasycarpum, 36. 

 Davidii. 28. 

 diabolicum, 43. 

 discolor, 26. 

 disHectum, 5, 13. 

 Douylaaii. 11. 

 Drumniondii, 5, 37, 

 elohulatum, 34, 

 eriorarpum, 36. 

 erofoim. 20. 

 erythrorarpum, 22. 

 orythrorladurn, 33. 

 ftlicifolium, 1.5. 

 floridanum, 39. 

 Frederici-Guilelmi,13. 



KiMnala, 18. 

 i;:l;tbnim, 11. 

 Klobosum, .5, 37. 

 Krandideniatum, 42. 

 ghseum, 45. 



Handjeryi, 22. 

 ht'bocarpum. 2. 

 Hrldroirhi, 23. 

 Ilt'tiryi, 47. 

 hetor(ji)hyllum, 30. 

 hortirola, 8. 

 hyrcanuiii. 3. 

 iberirum, 1. 

 insigne, 24, 25. 

 inttiior, 49. 

 italutn, 3. 

 japouicum, 14, 15. 

 Jiihlkei, 36. 

 Kmgii, 49. 

 laciniatum, 5, 15, 19. 

 Ixtum, 8. 

 laxifiorum, 29. 

 Leopoldii, 22. 

 leucoderme, 41. 

 linearilobum, 13. 

 lobulatum, 34. 

 longeraceinosum, 34 

 longilobuni, 29. 

 longipes, 9. 

 Lorbergii, 5. 

 lutescetta, 22, 36. 

 macrophyUum, 15, 21. 

 magnificuin, 37. 

 ni;indshuric«m, 40. 

 micropliyllum, 14, 37. 

 Miyabei, 4. 

 Mono, 7. 



inonspessulanum, 1. 

 montanuta, 19. 

 monumcntale, 38. 

 multiserratum, 20. 

 Negundo, 49. 

 nervosum. 22. 



INPEX, CONTINUED 



nigrum. 13,38,40. 

 nikciense, 44, 45. 

 ol»l(»nguin, 26. 

 ( )livfrianuin, 16 

 ttpalus, 3. 

 ornatuni, 13. 

 pahnaturn, 13. 

 Pjirsimsii, 15. 

 par\ idoruin, 7. 

 pennsylvanicum, 33. 

 pictum, 7. 

 pinnatifitlum, 13. 

 pitmnti folium, 13. 

 platariniiles, 5. 

 pohi'ni'iplntm, 13. 

 pycudu-ralifurnicLim, 



49. 

 pseudoplaianus, 22. 

 pulchntm, 43. 

 pulvcrulentinn, 2. 

 purpurasci'ii.s, 22, 43. 

 purpniatuni. 23, 

 piirpureum, 22, 

 gujidrirolor, 22. 

 Rcitr/ibachii, 5. 

 reticulatum, 13. 

 rhodocarpum, 11. 

 roseo-marginatum, 



13. 

 rubrum, 5. 13, 37. 

 rufinerve, 32. 

 Rugelii, 38. 

 saccharinum, 36, 38, 



40. 

 saccharum, 38, 40, 



41. 

 .sanguineum, 13. 

 Schlesingeri, 37. 



Sohwedleri, 5. 

 scolopendrifotium, 13. 

 Scmcnowii, 18. 

 semiorhiculntum, 37. 

 seplenilobuni, 13. 

 scssilifoliura. 13. 

 Sieboldianum, 14. 

 sinicum, 8. 

 Simonii, 22. 

 spicatum, 19, 20. 

 stachyophyUum, 34. 

 Stollii, 5. 

 striatum, 33. 

 tataricum, 17, 18. 

 taurieum, 2, 3. 

 tenellum, 7. 

 tetramerum, 34, 

 Thunbergi, 13. 

 tiliifolium, 34, 

 tomentosum, 37. 

 Trautvetteri, 24. 

 tricaudatum, 8. 

 tricolor, 8, 13, 22. 

 tridens, 37. 

 trilobatum, 1, 3. 

 tripartitum, 11, 36. 

 truncatum, 6. 

 Tschonoskii, .31. 

 ukurunduense, 20. 

 Van Volxemi, 2.5. 

 velutinum, 24, 25. 

 versicolor, 13. 

 villosum, 22. 

 violaceum, 49. 

 Wieri. 36. 

 Wittmackii, 5. 

 Wolfii, 25. 

 Worleei. 22. 



KEY TO THE SPECIES. 



A. Lvs. simple, mostly palmately lobed 

 (occasionally S-foHolate in No, 11). 

 B. Sepals and petals distinct (petals 

 wanting in Nos. S7 and 36) . 

 c. Fls. appearing with or after the lvs. 

 in corymbs, pajticles, or racemes. 

 D. Arrangement of infl. corymbose 

 {broadly paniculate in No. 4)- 

 E. Winier-tmds with several im- 

 bricate scales: lobes entire or 

 coarsely toothed, rarely lvs, 

 without lobes. 

 F. Lobes obtuse or bluntly 

 pointed. 

 G. Lvs. l-3}/2 ^'i- across, 

 usually 3-lobed; lobes 

 usually entire or with 

 few teeth. 

 H. Corymbs glabrous: lobes 

 entire, lvs. glaucous 



beneath 1. 



HH. Corymbs jmbescent, up- 

 right: lobes usually 

 dentate, lvs. green be- 



7ieath 



GG. Lvs. 3-6 in. across, S-6- 

 lobed; lobes toothed. 

 n. Infl. corymbose, many- 

 fid, pendulous: lvs. 

 glaucescent beneath; 

 lobes obtuse or acute . . 3. Opalus 

 HH. Infl. panicjilate, up- 

 right: lvs. green be- 

 neath and pubescent: 

 lobes obtusely acu- 

 minate 4. Miyabei 



FF. Lobes acuminate, finely 



pointed: corymbs glabrous. 



G. Lvs. glabrous beneath, 



6-7-, rarely 3-lobcd: 



corymbs stalked. 



H. Bar k of mature 



branches ashy gray or 



light grayish brown, 



slightly fissured and 



marked with lenticels. 



1. The lobes coarsely 



toothed 5. platanoides 



II. The lobes entire or 

 rarely with few teeth. 



monspessu- 

 [lanum 



campestre 



