108 PROCEEDINGS OF THE AMERICAN ACADEMY 



Mexico or Texas, the remainder being peculiar to the peninsula or ex- 

 clusively Mexican. The peninsula shares in tliis difference with 

 Mexico itself, the type of whose whole floi-a accords rather witli that 

 of the eastern portion of the continent northward, except so far as 

 it would necessarily be affected by the more tropical character of the 

 climate. Of this a good and sufficient illustration is seen in the fact 

 that of the Phaseoleoe, a tribe which is well represented in all the 

 Atlantic States, Texas, Southei'n New Mexico, Eastern Arizona, 

 Sonora, Lower California, and all of Mexico southward, not one 

 species is found within the limits of California, nor in the interior 

 basin west of the Rocky Mountains. 



The only collection that we have of the plants of Guadalupe is that 

 made by Dr. Edward Palmer during the last season, from February to 

 INIay, which is probably as complete as was possible, tiiough attended 

 with much labor and difficulty. He visited all parts of the island, 

 often finding it necessary to reach places which the goats had found 

 inaccessible, in order by means of ropes and poles to secure rare speci- 

 mens of species which appeared to have been elsewhere completely 

 extirpated. The entire number of species is 131, including 102 

 exogenous and 8 endogenous, the remaining 21 belonging to the 

 higher cryptogamic orders, — ferns, mosses, and liverworts. Omit- 

 ting a single phjenogamous species (a Heuchera), of which the ma- 

 terial is insufficient for a satisfiictory determination, the remaining 



109 may be divided into five groups : (1) Introduced sjDecies, of which 

 there are twelve ; (2) Those that range from the Pacific to the 

 Atlantic States, of which there are nine ; (3) Those that are found 

 throughout California, or at least as far north as San Francisco, num- 

 bering forty-nine ; (4) Those found only in Southern California, 

 below Los Angeles, or in Arizona, numbering eighteen ; lastly, those 

 peculiar to the island itself, of which there are twenty-one. 



The twelve species * of whose comparatively recent introduction 

 there can be little doubt, are all of European origin, and chiefly from 

 Southern Europe, and are all also found more or less widely natural- 

 ized in California. The original introduction of most is probably due 

 to the Spaniards, at least up<m the mainland, where the extent to 

 which several have become distributed is somethin<r marvellous. The 

 most remarkable is the Alfilaria (^Erodium cicutarium), which, unlike 



* Brussica nigra ; Oli(jomfris subitlata ; Silene GaUica ; Malva horealis ; Ero- 

 dlum cicutarium and E. mnsrhntum ; Sonrhiis ohrareus ; Anar/allis aruensis ; Solanutn 

 nigrun; Cheiwpodium album ; Avena J'utuu ; Brainus sterilis. 



