88 THE SAND STRAND FLOKA 



it is a conspicuous feature of the older dunes of the Californian coast, 

 especially at Monterey Bay. It is one of the characteristic plants of the 

 chaparral formation in certain parts of California. 



Argentina anserina (L.) Rydb. 



Perennial, stemless herb, silvery with white tomentum especially be- 

 neath, rootstock sending out numerous, long, slender, jointed runners 

 from the nodes; leaves 8—15 cm. long, in tufts, unequally pinnate; 

 leaflets in 5—30 pairs, oblong or rounded, with very small ones inter- 

 mixed, deeply toothed, white-silky, tomentose beneath or on both sides; 

 flower large, yellow. 



In temperate countries in both hemispheres, extending to the Arctic. 

 Seems to follow the coast in California, and is never absent from suit- 

 able localities on the sea shores of the Baltic. 



Fragaria chilensis Duchesne. 



Perennial acaulescent herb, with stout runners; upper surface of 

 leaves glabrous; rest of herbage densely pubescent with long weak hairs, 

 especially beneath; leaves of firm texture, dark green, leaflets 1 — 3 cm. 

 long; flowers 2 cm. in diameter, white. 



Coastal sands from S'an Francisco northward to Alaska. Also in 

 Chili. 



Potentilla reptans L. 



Perennial herb, with slender, prostrate stems, rooting at the nodes; 

 leaves petiolate; leaflets 5, obovate, coarsely toothed; flowers large, 

 yellow. 



Dispersed over Europe, Northern and Western Asia. Also natural- 

 ized in New Zealand. 



Rosa pimpinellifolia L. 



Erect shrub, with widely creeping subterranean stem, much-branched, 

 2 — 4 dm. high; leaflets small, glabrous; flowers pinkish. 



Europe and temperate Asia, but not in Arctic. Occurs generally 

 not far from the sea, and is a characteristic plant on the dunes of the 

 Friesian Islands (Buchenau). 



CRASSULACEAE. 

 Sedum acre L. 

 Perennial tufts, procumbent, consisting of numerous short, barren 



