260 BOTANICAL GAZETTE [APRIL 
depend upon rain gauge records alone, because of the variety of 
conditions at intermediate points which are brought about by topo- 
graphical conditions. Hence in preparing this map, as well as the 
ones of temperature, the influence of the larger topographic features 
and of altitude have been taken into consideration. Fortunately, 
TABLE II 
SEASONAL DISTRIBUTION OF PRECIPITATION EAST AND WEST OF DIVIDE 
EAST OF CONTINENTAL DIVIDE | WEST OF AL DIVIDE 
ALT. , c" 
= (FEET) a — alan ere — “during 
coring | year | SCE | owing | year | Cote 
PUNE O60 foe ks veo | 10.67 | 19.381 Se 
BONG 6 edna ee ce 39035 | 12.36 | 16.08 yA 
Boidere | uy cae 5347 4-12.63 |:18.46 69 
Breckenridge.......... G66 ie a 11.99 | 26.76 72 
Castle Rock 002755: 6220 | 12.73 | 17.65 72 
Cheyenne. oo 6088 9.40 | T2.20 77 
CONbran eee ee Cosa Be on :: 7.33 | 14-59 ae 
Colorado Springs...... 6098 | 13.00 | 14.41 go 
IRE tion es Ga ee 5272 | 10.03 | 14.02 72 
SIOCAMIRY 0 oh, ese Le ae ae Gap Giae 8.25 | 16.62} $9? 
Mt, Conia ee 4985 | 11.06 | 14.91 ve 
srand Junction........ WOO Sree Sly 4.27 | 8.50 5° 
PDS Oy ose Meas 5400 | 11.82 | 14.56 81x 
HOY... ce ieee eee 3386 | 12.71 | 15.32 Wt 
Idaho Springs.......... 7543 | 10.65 | 15.44 68 
Lake Moraine......... 10625 | 18.44 | 25.59 74 
Pere pea ee cr Ue Bi V dee cana bagae Ue Be 6.37 | 12.72 §? 
LEROY er 4380 | 12.22 | 16.05 76 
MONON ic ey. 2 Me ee nas SARE ae 9.29 | 17-29 338 
sccpime SE oe ee oO ee ee 8.42 | 15-91 53 
rike's Peak. 070.5, 14108 | 19.07 | 28.65 66 
cng he ere eee 4734 | 9-17 | 12.11 75 
BEURCNE oe oc 7745 5-45 75 
— Peele tee oe ane 7935 7.00 | 32.47 67 
OY veces es eee 3512 | 34.57} 18.31 80 baer 
Mean averape. oa 11.84 | 15.90 74 8.57 | 16.45 5? 
ees Pees 
however, the meteorological stations in Colorado are numerous 
enough and so happily distributed, that one is able to rely upon them 
as being fairly representative. 
The eastern part of the state has more rain (15-20 inches) than@ = 
strip closer to the mountains (10-15 inches). On the eastern slope 
of the mountains, localities between 6000 and 10,000 feet altitude 
have an annual precipitation of 15-20 inches; many localities have 
