1 62 W. S. Cooper 



Guadalupe Island, off the coast of Baja California, N Lat. 29°, 

 and, on the peninsula, San Ramon, N Lat. 32°. Very likely it 

 goes farther south. F. chamissonis has a much less extended 

 range — from Ucleulet, Vancouver Island, on the north, to Mon- 

 terey Bay on the south. ' 



The two species are closely allied and seem to intergrade. Two 

 additional forms have been segregated, F. villosa (Rydb.) East- 

 wood and F. lessingii Mey. and Walp. These approximate F. 

 chamissonis in range. Several hybrids have been reported (Ryd- 

 berg, 1922). 



The tribe Ambrosieae of the Compositae comprises genera 

 mostly American, and especially North American. Franseria 

 occurs mainly in western North America and northern and 

 central Mexico, with a very few species in South America (Hoflf- 

 mann, 1894). Rydberg's treatment of the genus (1922), in which 

 rather minute splitting is evident, recognizes 39 species in North 

 America. The generic center comprises Arizona, southern Cali- 

 fornia, and Baja California. The last named possesses the great- 

 est number of species. 



Tanacetum douglasii DC. and T. camphor atum Less. (fig. 6;') 

 are frequent members, within their ranges, of the foredune 

 community. The first is most abundant on the coast of Wash- 

 ington and Oregon ; a few records indicate its presence on Van- 

 couver Island and the Queen Charlotte Islands. The second 

 occurs on the coast of Oregon and California, frequently as far 

 south as Humboldt Bay, with an outlying station at San Fran- 

 cisco. The Pacific Coast species have been frequendy confused 

 with the eastern T. huronense; because there has been no oppor- 

 tunity to make a critical study of the doubtful specimens, the 

 ranges of the two Pacific species have been combined in figure 6;. 



Following Rydberg's treatment of the genus (1916), we find 



