6 - BULLETIN 617, U. S. DEPARTMENT OF AGRICULTURE. 
tures are recorded, this saltbush grows luxuriantly. Along the 
coast, where high temperatures are seldom recorded, it does equally 
well. The minimum temperature recorded at any place in California 
or Arizona where it is known to be growing at the present time is 
10° F., at Tucson, Ariz. 
The mean annual precipitation at places in California where the 
Australian saltbush is growing well without irrigation ranges from 9 to 
19 inches. This saltbush thrives about San Diego, where the mean 
annual precipitation is about 9 inches. Here, however, fogs make 
the conditions favorable, and plants no doubt do well with much less 
precipitation than would be the case inland. At Santa Barbara, 
where the mean annual precipitation is 16.6 inches, this saltbush grows 
luxuriantly, but it does not occur in as great abundance as about San 
Diego and Los Angeles. At Santa Cruz, where the mean annual 
precipitation 1s 27 inches, and about San Francisco Bay, where the 
mean annual precipitation is 22.5 inches, itis not found. Whether or 
not this is due to the heavier precipitation is not certam. It may be 
partly due to generally cooler weather, as the mean annual temperature 
at these places is lower than at points farther south where this salt- 
bush does well. The mean annual temperature in regions where it 
is more abundant is about 60°. However, at Salinas, where it is 
growing quite vigorously, the mean annual temperature is about 56° 
F., which is the same as at San Francisco and 2 degrees lower than at 
Santa Cruz. 
TaBLE 1.—Climatological record for various places in the saltbush area of Arizona and 
California. 
[Data from Bulletins Q and L, Weather Bureau, U. S. Department of Agriculture.] 
Temperature (° F.). 
Mean 
State and place of observation. annual 
Mean Maxi- Mini- | ee. 
annual. mum. mum. |. SLU: 
California: | Inches. 
San Diegos ei 0 ao Sh antennas, Seeeaays aid os Nie spe ece Sepa 61 101 32 9.4 
GOS PAIR CLOG gd Aaa eters apes are een fee ae aie ec ee e rte | 62 109 28 15.6 
Santa eB arDaray yee ets oe Sore 8 crs Se ec eS an 60 100 28 16.6 
Sanghuis Obispot se. se. Sete e Se ee ee or 59 | 106 22 19.2 
SEA ai ies RU Of eb Y Aoi Cana ane oe Shs cep a enn vB eee ea pp ath pee OS 108 22 27.0 
San SP raneisco ne ee ec gS oe pe a ae a MR LE 56 100 29 | > 22.5 
1G fo) WARS RS pee Se Dee ete Reet ce Gr ee ee ea eae 59 105 19 12.3 
SATTPTOSC sar pce ae nee ee et ne eRe ee Pee eee es 58 10! 18 14.8 
SAS aie eee AR De eee Ait Se oe ae SE 56 95 20 14.12 
Soledad sete reas fb rtp ie. By ey cee orien ypu Oke mr carete gayi oy ever cn | NSC eek |e ee a eae ee 8.97 
RCS! CU yee Be a eo wa aes ater ee See Regs eee 58 114 15 10.8 
Rvedlan dst esa aoe oe Oe po ee Oe re See eae gees 64 113 25 14.7 
PEGE VOTSIG Coy ss Ree Ra oe ce cage ager SIRE re Re Ree 62/95 | Ce Rees eee eee 10. 01 
ERT OSTA So erie as Ree oe ad ae Sek epee rete 63 114 20 9.2 
TMI ATe 322s Steno Sask Soe oe se es as eee ERS PSB ASE ees 7.65 
IB akersGeld Ss oie = i apse ce ane ea a ene eee 66 114 19 4.8 
MI ESOS ce Cenaes BAUD a OnC eee a CoE OA Aene ABE aBS scone cee aus 65.5 114 15 4.79 
Arizona 
YATE a Ee PRS Se gi ee pe ae La Sa RD ee ge ek Re ae Se 72.0 118 22 Lee 
IPNOCMKE 2 i die he cae i ee See eee ee 4 70.0 116 22 6.8 
TICS OM ease Soper SO CR te a ere eo ee 68.0 112 10 9.8 
