342 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



many other palms, is not tolerant of shade nor of long continued cool 

 and cloudy weather. Other species of Cocos that are less exacting 

 in their requirements of sunlight and heat have been found to do 

 well along the California coast. 



The possibility of introducing coconut palms into southern Cali- 

 fornia is not disproved by the absence of these palms from Egypt 

 and Palestine. Though the climatic conditions are probably favor- 

 able, it does not appear that any adequate effort has been made to 

 introduce the palms in those countries. 



The ability of the coconut to thrive on seacoasts shows that its 

 requirements of heat are not as great as those of the date palm. 

 Though probably less hardy than the date palm, it is not impossible 

 that the coconut may be able to exist in frost-free localities that have 

 not enough heat for the ripening of dates. 



The possibility of introducing the coconut palm into southern 

 California and Arizona can not be fairly tested by the planting of 

 the maritime varieties. The chances of success will be very much 

 greater with the varieties that are adapted to the dry interior locali- 

 ties of the temperate plateaus of the Andes. 



