ARBORICULTURE 



ARBORICULTURE 



379 



characteristic of arid regions take their place. The 

 reverse of this is true, as one goes north, where many 

 trees of the temperate humid regions also thrive in 

 this state, particularly in the relatively humid climate 

 of the coast, and are offered by our nurserymen. 



I. THE SPECIES HERETOFORE MOST EXTENSIVELY 

 PLANTED IN CALIFORNIA. 



The following trees are perhaps the commonest 

 species found in the plantings: 



1. Eucalyptus globulus. 



2. Cupreous macrocarpa. 



3. Pinus radiata. 



4. Robinia Pseudacacia. 



5. Acacia melanoxylon. 



6. Schinus Molle. 



7. Acacia decurrens var. 



dealbata. 



8. Acacia decurrens var. 



mollis. 



9. Melia Azedarach var. 



umbraculiformis. 



10. Phoenix canariensis 



(Fig. 358). 



11. Magnolia grandifiora. 



12. Ulmus racemosa and 



species. 



13. Cordyline australis (Fig. 



359) and species. 



14. Acer Negundo, and var. 



californica. 



15. Araucaria Bidwillii. 



16. Araucaria excelsa. 



17. Populus deltoides var. 



carolinensis. 



18. Juglans californica and 



species. 



19. Salix babylonica. 



20. Acer saccharinum. 



21. Eucalyptus robusta. 



22. Eucalyptus viminatis. 



23. Eucalyptus rostrata 



(Fig. 360). 



24. Acer macrophyllum. 



25. Pittosporum species. 



26. Cedrus Deodara and 



species. 



27. Betula alba. 



28. Grevillea robusta, 



29. Washingtonia filifera. 



30. Cinnamomum Camphora 



II. TREES BEING MOST EXTENSIVELY PLANTED IN 



CALIFORNIA AT THE PRESENT TIME. 



The following list, arranged in sequence according 

 to the actual number of sales made during the sea- 

 Bon of 1911-12, is compiled from data furnished by 

 W. B. Clarke, of the California Nursery Company, 

 at Niles. The percentages refer only to the twelve 

 species here enumerated, and not to the total number 

 of trees sold by the nursery, which has a large and 

 varied assortment of species, many of which aie more 

 suitable and more effective than those for which there 

 is, at present, the greatest demand. 



Per cent. 



Eucalyptus globulus 40.8 



Cupressus macrocarpa 12.0 



Platanus orientalis 11.4 



Eucalyptus rostrata 10.2 



Populus nigra italica 6.2 



Pinus radiata - r >.0 



Acacia decurrens dealbata 3.5 



Acacia melanoxylon 3.0 



Populus deltoides var. carolinensis 2.2 



Robinia Pseudacacia var. Decaisneana 2.0 



Acer saccharinum 2.0 



Schinus Molle 1.7 



III. SELECTIONS FOR SPECIAL PURPOSES. 



The following lists are from species now offered in 

 the California trade and are intended to be suggestive 

 only, and not by any means complete. New species and 

 varieties are constantly being added to the nursery 

 stocks, some of which will be found particularly well 

 adapted to certain conditions of climate and soil, and 

 will doubtless replace others now in use. 



1. For subtropical effect. 



That there is in California strong appreciation of 

 subtropical effects in gardening is shown by the great 

 demand for dracenas and such large-leaved plants as 

 palms, magnolias, bananas and rubber trees. That the 

 effect produced by the planting of such trees so often 

 fails to be satisfatory is largely due to one or both of 

 two causes, either unsuitable location of the speci- 

 mens, or choice and association of unsuitable species. 

 To prevent a repetition of the first-named error, the 

 piospective tree planter is recommended to consult the 

 article on Landscape Gardening; and to avoid the 

 second, a selection from the following list is suggested, 

 with the addition of such large-leaved herbaceous 

 plants as cannas, colocasia, cynaras, funkias, Gunnera 

 scabra, pampas grass, veratrums, agaves, yuccas, aloes, 



Woodwardia radicans and Rodgersia podophyUa, to- 

 gether with such shiubby plants as bamboos, giant reed, 

 the choicer varieties of castor-bean, Senecio grandi- 

 folius, Polygonum sachalinense and P. Sieboldii. 



A. Small trees or tall shrubs. 



Acanthopanax ricinifolium. 



Aralia chinensis. 



Aralia chinensis var. mand- 



sehurica. 

 Aralia spinosa. 

 Arundinaria falcata. 

 Chamserops humilis. 

 Dicksonia antarctica. 

 Eriobotrya japonica. 



AA. 



Catalpa bignonioides. 

 Catalpa ovata. 



Catalpa speciosa. 

 Cordyline australis. 

 Cordyline Banksii. 

 Cordyline indivisa. 

 Cordyline stricta, 

 Corynocarpus. 

 Erythea edulis. 

 Eucalyptus calophylla. 

 Eucalyptus ficifolia. 

 Ficus Carica. 

 Ficus macrophylla. 

 Gymnocladus canadensia. 

 Jubtea spectabilis. 



Erythea armata. 

 Musa Ensete. 

 Prunus Laurocerasua. 

 Ricinus cambodgensU. 

 Ricinus macrophyllus. 

 Ricinus sanguineus. 

 Ricinus zanzibarensis, 

 Tetrapanax papyrifera, 



Larger trees. 



Livistonia australis. 



Magnolia grandifiora, 



Paulownia tomentosa. 



Phcenix canariensis. 



Phcenix dactylifera. 



Phcenix reclinata. 



Phoenix Rcebelenii (P. humilia 



var.) 



Phcenix sylvestria. 

 Phytolacca dioica. 

 Trachycarpus excelsus. 

 Tristania conferta. 

 Washingtonia filifera. 

 Washingtonia robusta. 



Eucalyptus globulus can also be used effectively if cut 

 down periodically when the falcate leaves begin to ap- 

 pear; it will continue to shoot up vigorously from the 

 same root for several years. E. robusta is useful for 

 screen purposes if cut down before it becomes strag- 

 gling. This can also be said for E. polyanthemos, E. rudis t 

 E. Risdonii, and many others. E. polyanthemos is cer- 

 tainly more beautiful than E. globulus and would not 

 need to be cut down so frequently. 



2. Trees with ornamental flowers (for California) 



In making the following grouping, arranged accord- 

 ing to relative hardiness, it has been impossible to give 

 precise information as to the exact degree of frost- 

 tolerance of the several species, as only meager pub- 

 lished data on the subject are to be found. 



A. Susceptible to light frost. 



The following would probably succumb to a temper- 

 ature of 28 F.: 



Eucalyptus calophylla. Jacaranda ovalifolia. 



Eucalyptus ficifolia. 



AA. Susceptible to heavy frost. 



The following are not likely to stand a temperature 

 of 20 F. Some of them may succumb at 25 F., particu- 

 larly when young. 



Acacia Baileyana. 



Acacia cyanophylla. 



Acacia decurrens var. dealbata. 



Acacia elata. 



Acacia falcata. 



Acacia longifolia. 



Acacia nerii folia. 



Acacia pendula. 



Acacia salicina, etc. 

 Bursaria spinosa. 

 Eucalyptus cornuta. 

 Eucalyptus corymbosa. 

 Eucalyptus polyanthemos. 

 Eucalyptus sideroxylon var. 



pattens. 

 Hymenosporum flavum. 



AAA. Hardy. 



Acacia pycnantha. 



^Esculus carnea. 



^Esculus Hippocastanum. 



Albizzia Julibrissin. 



Catalpa bignonioides. 



Catalpa ovata. 



Catalpa speciosa. 



Cercis canadensis. 



Cercis Siliquastrum. 



Cratsegus mollis. 



Cratffigus monogyna (vars. 



Paulii, punicea, alba plena, 



etc.) 



Koelreuteria paniculata. 

 Laburnum vulgare. 

 Lagunaria Patersonii. 

 Magnolia acuminata. 

 Magnolia grandiflora. 

 Magnolia Kobus. 



Magnolia Soulangeana. 

 Magnolia stellata. 

 Paulownia tomentosa. 

 Prunus Armeniaca (double. -fld.) 

 Prunus cerasifera var. atro- 



purpurea. 

 Prunus japonica. 

 Prunus Persica (white-fld., 



double red-fid., dark-fid., 



etc.). 



Prunus spinosa (double-fid.). 

 Pyrus Halliana. 

 Pyrus ioensis (Bechtel's double 



crab). 



Robinia hispida. 

 Robinia Pseudacacia and var. 



rose a. 

 Sorbus Aucuparia. 



