224 CALIFORNIA ACADEMY OF SCIENCES. 



California in general, and then the absence of certain genera 

 and species does not appear so remarkable. 



The summit of the coast range seems to be a barrier that 

 limits the habitat of many species, but there are a few from 

 the interior not found in the Coast Range flora that unex- 

 pectedly reappear upon the islands. 



The known flora of Santa Cruz and Santa Rosa Islands 

 now numbers close upon four hundred species, that of Santa 

 Cruz amounting to three hundred and eighty, and that of 

 Santa Rosa to nearly two hundred species, with only twenty 

 found upon Santa Rosa that have not been reported from 

 Santa Cruz. 



If the insular endemic flora of these islands is supposed 

 to number twenty species, some doubtful ones must be in- 

 cluded; nine of these twenty endemic species inhabit also 

 Santa Catalina and Guadalupe Islands, leaving eleven or 

 less, peculiar to Santa Cruz, Santa Rosa and San Miguel. 



Of the remaining three hundred and eighty species, over 

 three hundred and fifty-five grow about Santa Barbara and 

 in the adjoining Santa Inez mountains, leaving twenty-five 

 species still to be accounted for, which, with the present 

 knowledge of their distribution may be considered as be- 

 longing to the San Diego flora, or in a few instances, to the 

 plants of the interior region. 



The following notes and observations concerning main- 

 land and insular plants having, perhaps, sufficient value to 

 be worthy of publication, are here appended : 



Delphinium Pareyi, Gray. Bot. Gazette, XII, 50. 

 This seems to be the most common species of the Santa 

 Inez mountains, and is abundant upon the islands. 



Platystigma Californicum, Benth. & Hook. =P. denti- 

 culatum, Greene. 



