Strand and Dune Flora of the Pacific Coast 149 



makes a few scattered appearances north o£ Vancouver Island, 

 the farthest being at Prince William Sound, Alaska. It is re- 

 ported from a number of places in the interior of California, 

 Oregon, and Washington, and even in Idaho. The specimens 

 from these regions that I have seen are consistendy very differ- 

 ent in aspect from the coastal form, and seem to agree With, the 

 description of /. textilis Buch. (/. lescurii var. elatus Engelm.). 



The species occurs also on the Pacific coast of South America. 

 It is reported from Ecuador, Chile, Argentina, Patagonia (Buch- 

 enau, 1906; Skottsberg, 1910, 1916). According to Buchenau, it 

 is a good species, but transitional forms occur v^ith /. balticus 

 Willd., which is found in Europe, North and South America, 

 and Asia, and with /. andicola Hook., an inhabitant of the Andes 

 from Colombia to northern Chile. 



Polygonum paronychia C. and S. (fig. i^) is a minor but com- 

 mon inhabitant of unstable sands, usually not close to the strand. 

 Its range is not extensive — from Puget Sound on the north to 

 Monterey Bay on the south. It belongs to the section Avicularia, 

 which includes several species partial to sea beaches. 



Atriplex leucophylla (Moq.) Dietr. (fig. i/), most aggressive 

 of the foredune builders in its advance toward the sea, is con- 

 fined to the coast of California and Baja California, ranging 

 from Humboldt Bay on the north to Bahia de Sebastian Vizcaino 

 on the south. It occurs also on the islands off the coast of south- 

 ern California. It seems to belong with the pentandra group 

 of the subgenus Obione, but is more primitive than the species 

 which seem nearest to it (Hall and Clements, 1923). It is one of 

 the least variable of the North American species. According to 

 Hall and Clements, it seems probable that it originated in Mexi- 

 co and became separated from the ancestral line in the course of 

 its northward migration. 



