NO. 3 DUNKLE : PLANT ECOLOGY, CHANNEL ISLANDS 289 



seaward slopes on Anacapa but exists in many and varied locations 

 on the three larger islands. The coastal sagebrush, Artemisia californica 

 or the variety insularis is on all the islands. On southern exposures the 

 species grows stiffly erect and compact, while on northern or eastern 

 exposures it grows with long, flexuous branches and longer leaves. As 

 this association is commonly found on hillsides and canyon slopes the 

 soil is rather coarse in texture and often relatively shallow. There is a 

 great difference in the evaporation rates of southern and northern ex- 

 posures as was indicated in the preceding section. 



TABLE 4 



DISTRIBUTION OF CHAPARRAL SHRUBS 

 ON THE FOUR LARGER ISLANDS 



Islands 



KEY ^ - a 



C3 N rt g 



A - Abundant J U O J 



X - Occasional 5 5 5^ 



c c c c 



p3 cd c3 c3 



CO C« CO </D 



Quercus dumosa Nutt _ X X A - 



Dendromecon Harfordii Kell X A X X 



Prunus Lyonii Sarg _ _ X X A X 



P. ilicifolia Walp „ X X X X 



Cercocarpus betuloides Nutt _ XXX- 



var. alnifolius Dunkle XXX- 



var. multiflorus Jepson _ - X X - 



var. Traskiae Dunkle , _ - - X - 



Photinia arbutifolia Lindl _ X A - - 



var. macrocarpa Munz „ - - A X 



var. cerina Jepson - - X - 



Rhamnus crocea insularis Sarg. „ _ _ X X X X 



Ceanothus arboreus Greene _ _ X X A - 



C. crassifolius Torr _ XXX- 



C. megacarpus insularis Munz _ _ _ X X A X 



Rhus laurina Nutt „ „ _ X A A X 



R. diversiloba T. & G _ _ X X A X 



R. ovata Wats _ - X A X 



R. integrifolia Benth. & Hook _ _ X X X X 



Arctostaphylos diversifolia Parry _ _ X A X - 



A. tomentosa Lindl ^ _ X A X - 



A. insularis Greene X A X - 



A. subcordata Eastw » X X - - 



A. bicolor Gray - - X - 



