40 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 13 



Malacothrix Clevelandii Gray, Bot. Calif. 1:433. 1876. 



Santa Barbara Island, August 12, Elmore 370. 



Aggressive on disturbed areas in cismontane southern California and 

 on the islands Anacapa, Santa Cruz, and on the above new extension of 

 range, Santa Barbara Island. Apparently migratory on the mainland. 



Malacothrix foliosa Gray, N. Am. Fl. ed. 2, 1, pt. 2, suppl. :455. 

 1886. 



Point Bennett, San Miguel Island, September 12, Elmore 338. 



On the islands Santa Cruz, San Clemente, Santa Barbara, and the 

 above extension of range, San Miguel. 



Malacothrix incana (Nutt.) Torr. & Gray, N. Am. Fl. 2:486. 

 1841-43. 



Tyler Bight, San Miguel Island, August 3, Elmore 322. San Miguel 

 Island, August 10, Elmore 327. 



Channel Islands of Santa Rosa, Santa Cruz, San Miguel, and the 

 adjacent coast. 



Malacothrix saxatilis implicata (Eastw.) Hall, U. C. Publ. 

 Bot. 3:269. 1907. 



Middle island of Anacapa group, August 1, Elmore 248, steep rocky 

 slope. 



Channel Islands of San Miguel, Santa Rosa, Santa Cruz, San Ni- 

 colas, and Anacapa. 



The evolution of the genus Malacothrix, judging from the numerous 

 segregates of varying rank that are known from the islands, has ap- 

 parently been highly responsive to the stimulation of successive disjunc- 

 tions and conjunctions of populations as induced by physiographic evo- 

 lution. 



Perezia microcephala (DC.) Gray, PI. Wright. 1:127. 1852. 



Prisoners Harbor Canyon, Santa Cruz Island, August 2, Elmore 

 263, dry rocky hillside. 



Open arid slopes of the chaparral belt from San Luis Obispo County 

 south to Baja California and the adjacent islands of Catalina, Santa 

 Rosa, and Santa Cruz. The limited island distribution of this strongly 

 successful perennial of the mainland, indicates at least recent appearance 

 on the islands. 



