[From the BULLETIN OF THE NEW YORK BOTANICAL GARDEN, Vol. 6, 
No. 21. IgI0.] 
A Phytogeographic and Taxonomic Study of the Southern 
California Trees and Shrubs 
By LeRoy Asrams 
CONTENTS 
PAGE 
PrETACE si) so hd ic ce doelens obo 6 sis vwleaie'e wlio, ovale bie e.n\e\\0.eyee ean 300 
Anmtrod ucts. 6 ciosc ice w/a ods ss sinless bie-e'e dle 0/6, + \efeu eie ce sheet 301 
Physiography 0 255 cc's siecs oe os see oe lel oie wilelons iene tne ener 301 
Climatology 2.2 '.. ccc 's viele cic elo ve wee wlela isle!» she lel Eisen 304 
General description 6 0.2... 62. a sisls oleic ese ciel telel ei aete ea 304. 
Temperature and rainfall records... 522. -+)o5 =e ee eee 305 
Phytogeoeraphic features .:.....06 65 0. alc «cvs 0) le wie 2 eee eee eee 307 
General description. ..).....0 sec ss ie one ne pie oles ieee ee 307 
Boreal region .. 01. 0002 22 ds reeled a ol 2p Wien ce er 308 
General deseription oi...) ./)e/5 5 sss in a! 0 'e4 ole 308 
Canadian Zone. oi. heise a ee eid oe Gib stelle) s eee eee 308 
Austral region. «5.3% sk aoe hadley os, 8 Seer 310 
General description’. .13.0)5 225%. ¢c)iele oy oclels 2 jolene eee ee 310 
Transition zone’ i's 3/52 42).5 0s). «o's hers sige o<s eee 310 
Upper austral zones: s)0.2 od o.oo so te 2 = i Sire, 
General description’. 2/4). i.1, oe 0c ise > 2 ee eee 312 
Coastal slope. os 2. /e. ek a 5 aes siw sue oe os ale etree nr 312 
Desert slopes: ci sas etec's 46 4's sas baleen ore een 317 
Lower austral Zon. 65.0). 5 ob ale in oa cpeieim etki ohe eee 318 
General description : 0. 2. ..).).'. 4/s/-.9)- ss ee 318 
Interior valleys... 205.60). .0+. «004 nee 319 
San Diego districts)... cicysic oie icles etree tee eee eee 319 
Mohave desert.’ .i¢\. tiv. J2 v's cic babe ot oie bie eters eee ee 320 
Colorado desert .:.:60.4.5 5 0)250,s\00 5 4s + es bie el 321 
Explanation of iplates i) 3.00001. 0. «cies =e fn elas cele ee 322 
Annotated catalogue of the southern California trees and shrubs......... 323 
PREFACE 
In the study of the trees and shrubs of southern California I have 
endeavored to discuss the phytogeographic as well as the taxonomic 
features, as trees and shrubs, being long-lived and non-migratory, 
furnish excellent materia! for phytogeographic observations. 
The present paper is the result of field studies carried on along 
these lines for a number of years, together with an examination of 
specimens in the principal herbaria of the United States. 
Many helpful suggestions in the study of the phytogeographical 
( 300) 
