94 
BOTANICAL FEATURES OF NORTH AMERICAN DESERTS. 






































Fort Yuma, Ariz. Pheenix, Ariz. Tucson, Ariz. Mohave, Cal. 
Max.) Min. | Mean | Max.| Min. | Mean | Max.| Min. | Mean | Max.) Min. | Mean 
temp. temp. fall, temp.|temp. pe temp.|temp. Tall, temp.) temp. ‘ek 
No. of years’ 
observations, | 26 | 26 | 20| 17) 17 | 22) 6) 6/ I5/ 5] § 26 
ee Lae Ins. ae BT a ae 7 Jase , Ins. 
januaryen.,> =: 81| 22 |0.42 87! 12 | 0.80} 80] £7 | 0.79] Jol 16°) Game 
February... <=. ES ey hte ay g2| 19 o7or 83) 34 -90| 78) 20 -92 
Maren tapes sh Too} 31 | .26 | 7] 24 .58| 92] 22 771 83) 26 -75 
Bi aes eo 107| 38 07 | 105] 30 -30} 95| 28 .27| 100] 35 AS & 
May ee ohn ae 112] 44 7.04 1.513) 35 -i a) 10s) 48 14| 102} 38 .03 
JUNG. Scere Ely; G2). ai 130) 45 ro} 112| 48 .26) 107; 48 205 
Julye tee eee 118| 61 | .14 | 116] 46 | 1.03] 108] 59 | 2.40| 115! 64 | .08 
reel at leony ae I15| 60 35 | 116} 49 .88) 109] 57 60) 112} 57 .04 
September. .... TTS) 556) < Th Fea) 230 64) 107] 49 16) 104) 45 .07 
Octapers sean + 108} 41 | .28 | ro05| 34 -37| 98} 29 .64; 93|) 40 225 
November..... Omir 3i. 7) 236 97| 24 -54| 90] 21 81; 84) 29 -40 
December... 83} 24 | .46 95| 18 .86| 83] Io | r.00} oj 15 | £.26 
\ ost aes 118] 22 |2.84*| r19| 12 | 6.93] 112] ro [11.74] 115] 15 | 4.97 
Prineville, Oreg. Lost River, Idaho, Laramie, Wyo. Torres, Mex. 
Max.| Min. | Mean | Max.) Min, | Mean |Max.| Min, | Mean 
temp.| temp. Ta iL temp. temp. | "fai]. temp.| temp. exif ee 
: zy fall, | fall, 
No. of years’ 1h 
observations. 6 6 6 5 5 5 5 5 13 
° 2 Ine, Viee 3 int. Gt ” Ins. | Ins. | Ins. 
January 76 |—= 9 |0.64 | 45 |—26 |r.12 | 52 | —23 | 0.23 > 0.00 
February, tse 73 |—17 |1.09 | 49 |—41 | .26 | 54 | —4o J96 .00 
March Ax. cee 83 5 | .8r | 62 |— 1] .gor |} 63] —14 2 ae fofe) 
April: e426 92 r2 | 20411775 14 | -35 | 74 | —10 | 1.19 ™ .00 
MAY sstess wich 96 21 | .80 | go TE Ys 27 198 5 RY ly gee .00 
June.:51.>. ee 98 a4) 395 Vos re | 68: Pox 28° 1.199, ee 00 
july ee 119 29 | .03 | 99 30 | .61 | 92 33 | I-30 |3.99 | 7.26 
Augusta icass a es S031. S647) 8 25) 264 Wor 32 | 1.097 \ian ae 
September....| 98 20H) “VBI 4 eo 21 | W445) Bs L7 -73 | °.75 eee 
Octoheri.o.94 89 20 aSHeas 14.| .63 | 72 7 06° -eaar 04 
November..... 82 9 |1.06 | 60 |— 8 | .92 | 63 | —12 225 | 
December. . ..; 7O.t— 5] 297 | 48 a3 18a F152 | 37 «37 1.02 
Years. «33 I1I9g |—17 |9.01 | 99 |—41 |8.65 | 92 | —40 | 9.55 eeaeuesoe ee 








*26 years’ observations. 
