NO. 2 GENTRY : LAND PLANTS 23 



In canyons and on bluffs on the islands of Santa Cruz, San Clemente, 

 and Santa Catalfna; type from the latter. Elmore's collection from 

 Santa Barbara is apparently the first citation for that island. 



Eriogonum GRANDE Greene, Pittonia 1 :38. 1887. 



Middle island of Anacapa group, August 1, Elmore 232, steep rocky 

 slope. 



Southern California and the Channel Islands; the type from Santa 

 Cruz. It appears to be lacking only on San Nicolas Island. 



Eriogonum rubescens Greene, Pittonia 1:39. 1887. 



San Miguel Island, Tyler Bight, August 3, Elmore 321. Point Ben- 

 nett, September 12, Elmore 334. San Miguel Island, August 10, Elmore 

 325. 



Known only from the Channel Islands of Santa Cruz, Santa Rosa, 

 Santa Catalina, San Clemente, and San Miguel. 



This plant is closely related to E. grande Greene, to which it has 

 been referred as a variety by some authors. Numbers 325 and 334 are 

 atypical in the densely flocculose tomentum of the involucres and the 

 compact cymose head-like inflorescences. They may represent a hybrid 

 form, a condition also indicated by the tendency of the mature involucres 

 to double their number of teeth. 



The interesting genus Eriogonum shows considerable specific and 

 subspecific variation and in this it appears to be expressive of environ- 

 mental differences. Hence, since environments have varied in the geolo- 

 gic past, the present segregates of Eriogonum would be reactive products. 

 A cytogenetic study of the genus might find physiographic correlatives 

 in insular evolution. Who w^ill make it? 



POLYOGONUM AVICULARE L., Sp. PL 362. 1753. 



Santa Rosa Island, Becher Bay, August 2, Ebnore 213. 



A cosmopolitan weed native of Eurasia; on Santa Rosa and Santa 

 Catalina Islands also. 



Chenopodiaceae 



Atriplex leucophylla (Moq.) Dietr. in DC, Prodr. 132:109. 

 1849. 



Middle island of Anacapa group, August 1, Elmore 237, steep rocky 

 slope. 



A littoral halophyte from Plumboldt Bay, California to Vizcaino 

 Bay, Baja California; type from California. 



