roots 



TREES 



2lclii(. A~i(hinich, var. it>iihriU-i<Ulor»us, is foun.l uii- 

 satusfuetory in tlu- imnirainte Ticiiiity of the roast; as a 

 siae\yalk twc it is fxoeedinc:lv untidy \\iien losin- its 

 leaves, and is also nmeli subject to scale insects. 

 ^Aciici,! }Ui'l.iinKr,ih.u is L^-enerally debarred from tlie 

 Citrous belt, as a. breeder of scale; when niatnm it is 

 said to suffer ([uickly from the effects of drou-iil. In 

 the moistev climate of the immediate vicinity of the 

 coast, near San Francisco, however, it proves enlireiy 

 satisfactory. 



Pi>p/i(t(s a/lxi. Ji\>!>iHia P.':;,'iidararia and fTJmu.^ 

 raconosa are exceedini,dy troublesome when nsrd as 

 sidewalk trees on narrow streets; their surfu 

 often lireak the cement 

 or asphalt sidewalks. _ 



and the suckers conn- 

 up in the midst of 

 lawns several yards 

 away ironi the parent 

 tree. 



PicX-'i iiiiio-oplijilhi 

 is another tree injuri- 

 ous to sidewalks. 



£iivaJ>fptHs Globii- 

 Jks, and in fact almost 

 all species of the ge- 

 nus, are frequently 

 debarred Ity town ordi- 

 nance from growth 

 within (30 or even 70 

 feet of a sewer, on ac- 

 count of the remarka- 

 ble length and pene- 

 trating power of their 

 roots. 



Paiiloioi i'l itirperi- 

 alis is sometimes ob- 

 jected to on account 

 of the somewhat un- 

 tidy appearance of the 

 persistent seed - pods, 

 which require no little 

 labor if all are to l)e 

 removed after flower- 

 ing. 



GreviUea r ohu s t it 

 has brittle wood and is 

 usually much broken in 

 heavy winds, but can 

 be used with satisfac- 

 tion if kept well cut 

 back. 



The species of Ph<p- 

 nix and Jub.'ea shouhl 

 be avoided on account 

 of their L.>w, wide- 

 spreading habit, ex- 

 cept for avenues and 

 boulevards where there 

 is no sidewalk or where 

 there is from 20 to 30 

 feet space between 

 sidewalk and drivr- 

 way. 



AiJanthiis (ihnul n- 

 losa has a bad repnta- 

 tion on account of its 



disagreeable odor, but as this is only found in the stami- 

 nate trees, it can be avoifled by planting the pistillate 

 (fruit-bearing) trees only. 



8. Trees for Alkali Soifs. — There are many places in 

 those parts of the state that enjoy a high temperature 

 and low rainfall, where the percentage of alkali salts in 

 the soil is too great for the cultivation of most of onr 

 ornamental trees, and where it is very important that 

 some shade-producing species be grown. 



A. Tolerci )U of Rtrong " hIncJc " aJkall { S "(J unit r<i r- 



hoiHlf,'). 



The most alkali-tolerant tree of those yet tested is 

 ICa'Ireuferia panlcula/a, a small species In to .'iO fcrt 

 high, with feathery, pinnate leaves and ornamental 

 yellow blossoms. 



TREES 



1847 



.. ToU'raut of mvdiu}) 

 Aca(.'ia mehuioxylou, 

 Allan tus ghuidulos;]., 

 Alljizzia luplumtha, 

 Ciisuariiia equisetifuliu, 

 Eucalyptus ainygdaHuji, 

 var. ungnytifolia (api);i- 

 rcutly tlie least sensi- 

 tive of the Eacalyi^ts), 



AAA. Only fail 

 Acer maeropbyllum, 

 Acer Negundo, Tar. Cali- 

 fornicutn. 



iJi {r],;,'f]y '■ u-J<if>' " so.Its). 

 Eur.'il.vjitus rostr;i.t;t ( Fij.'. 



Eui'uly]>tus sideroxylon, 

 vur. ro.sea, 



Phcenix daetylifera, 



l'latun\i.s orien talis, 



I'lip^diis Fremonti, 



Quorcns lobata, 



Kobinia Pseudacacia. 

 ly toJeranf. 



Cinnamomum Camphora, 



Gleditsehia triaeanthos, 



Ulmus spp. 



Wasliiu]L,'tonia filifera. 

 AAAA. Tested and 

 found u)isiiitahJe. 

 Most of those trees 

 of the humid regions, 

 e. g., the eastern states 

 and N. Eiirope, which 

 have been tried on al- 

 kali soils, have been 

 found to suffer and to 

 remain dwarf and 

 stunted. This is par- 

 ticularly true of Liri- 

 "dendron Tulij)ifera, 

 (J II ere us pedifvculata 

 and species of Tilia. 



Since writing the 

 al)Ove, the following 

 additional information 

 on the alkali tolerance 

 of ornamental trees 

 has been brought to 

 light through the in- 

 vestigations of Dr. R. 

 H. Loughridge of the 

 Agricultural Experi- 

 ment Station at Berke- 

 ley, and has courte- 

 ously Jieen placed at 

 my disjjosal. 



Total amount of salts 

 actually found in the 

 upper four feet of soil 

 in which the following 

 trees were growing, ex- 

 pressed in tons per 



'"'- *^ • Tons per acre in 

 depth of 4 feet. 



Kcelreuteria pani- 

 culata 32 



Platamis orientalis 21/^ 



Eucalyi'tus amj-g- 

 dalina 20 



Eui-abijtus aii^is- 

 tifolia 20 



Wasliingtonia ( spe- 

 cies not stated).. 7j^ 



PhcenLx daetylifera 5 



(J i n n a m o ru u m 



<,Miniphora 'i^^i 



Jos. BuRTT Daw. 



2566. One of the i^um 

 Eleven years planted; 



trees— Eucalyptus rostrata. 



8G feet high. California. 



IV. Trees for 

 Southern Cali- 

 FORNiA. — ^'frc'cf Trees: 

 Sferculia diversi folia , Australian Bottle Tree; Acacia 

 Jfehnioxi/Joii, Blackwoo.l Acacia; Cinnamoinum Cam- 

 phora, Camphor Tree; Sln-cu Ha acerifoJia, Australian 

 Flame Tree; Eucalyptus rohn.sfa, Swamp Mahogany 

 Gum; GrcviUea rohusta, Silk (lak; .l'''/c/«. dealtjata, 

 Black \Yattle ; Jaeoranda ora li folio : Li(iusfrum Ja- 

 /)nuicn»i, Jap;in Priv(d; Piinis radiata, Monterey Pine. 

 The al)0ve are the liest trn 1rc<-s for street purposes, 

 but among these might be p[a<-cd <_'nrd!/line aiisf)-alis 

 and C. indivisa, and several kiuils of ]ialms. One de- 

 ciiluous tree is much used — JSleliii. Avederaeh, var. 2(m- 

 hrariilifontiis, the Umbrella Tr(U'. Though less known 

 or used, Pucali/pfns catojihiiHa is by far a better street 

 or sidewalk tree than P. rnhusfa. Very few conifers 

 other than those noted do well in this climate. Any ex- 

 tension of the above list must be made almost entirely 



