A Phytogeographic and Taxonomic Study of the Southern 
California Trees and Shrubs 
By LeRoy ABRAMS 
CONTENTS 
PAGE 
Pret a Ceo seen eects eases ee tine ap ieee tue on ea ee 300 
Introduction: 44.13 cnce en. Hw ease atendai iene a SS ead pee ag elas 301 
Physiography :as:cd ade naieae ans Gan eat ae wed ata wave edie 301 
Climatology sii0. ci sietaae cea edind wae ba ce ele Sioa eee 304 
General -descriptiony fos wweneinataeedds Viewed ee Eee ad 404 
compere tite and rainfallrecords.... 0.0.0.2... 00000 e sees 305 
Phytogeographic features... 0.0... nee 307 
General deveripuen de Diane saucy reretle GEM ahecite deena chs Cul ee ean ee otartee eet tees 307 
Boreal tépion &..2.23, iawsse oy ee Pha eeat ed eas See 308 
General description. ...... 00.0.0... 0c cece eee 308 
Canadian :26ne ascidian eae ae ees unre tion 308 
Austral repiome: ico. eden Soho ee on ge a ees 310 
Geneéral description’: «esa cry02 au eenena de eapns de dew eee a od 310 
ALTansitlOn:ZONne ys aicvales ioe a Seah en Saeed ee eS 310 
pper austra TN pede ahd ine de acres aa mi eum ant ed aap: ake Me ER oe paca Sh Sct 312 
eneral description... 2.2.0.0... 2.02. c cee eee eee eee 312 
Coastal:slope: sha. Mae ee beta tie ne ht cede acne ees 312 
Desert slopes sii-ci1 gach enw eas atti doit Hees 317 
Lower austral 2One 9 2 cds decency bee Barra bE nae RS 318 
General description <4 ica cee kater awe aie sede wees 318 
Interior valleys... ee ee ene 319 
San Diego-district «e'0i¢ wisd ane we duaavadaw eee eee ees 319 
Mohaverdesert.is.c% eye dees aos ae Yates Me eae Dae 320 
LOTad Ord CSer tr ssa ht Sap ceca ees staat nares eat erage 321 
Explanation: of plates <3 sataciaieat tae en a chad gadis warned ans 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 material 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) 
