

Average of over to plants 














<I 
A HCEN & CO. BALTIMORE 
PLATE 4: 
; meat 
per too sq. meters 
Average of less than io and more 
than 1 per 100 sq. meters 
Widely scattered clumps | 
ST MARY'S \ 
HOSPITAL | 
None 7 
= ! 
Y 
=x i 
12) 
x 
2 
TUCSON lea ¢ a4) 
COURT Mouse \\ MA | 
WEL | 
pENNINGTON i | [ \ \ 
—— - 4 --—} — - — capper a 
Reger | A 
Mintamo | 
| 
L 
: pee pa Pere ae : | ¥ =. en ie J.C.Blumer del. 
MAP OF DESERT LABORATORY DOMAIN, SHOWING DISTRIBUTION OF LARREA TRIDENTATA OVER AN AREA OF ABOUT 1,800 ACRES 
SCALE: 315 INCHES PER MILE 
