OF MARINE COASTS. 117 



A. umbellata Lam. 

 Perennial, with slender, prostrate stems, 2 — 10 dm. long, viscid; 

 leaves almost glabrous, roundish ovate, the margin often sinuate, 2 — 4 

 cm. long, narrowed at base to a slender petiole; calyx rose-purple. 



Sand dunes along coast of California from Columbia Eiver to Lower 

 California. 



PKOTBACBAB. 



Bariksia marginata Cav. 



Common on coastal sand dunes at St. Vincent's Gulf in South 

 Australia (Tepper), but not confined to coast. 



Several other species of this genus occur on the dunes of Victoria and 

 Western Australia, as well as on those on the Queensland coast. 



ILLICEBRACEAE. 

 Corrigiola litoralis L. 

 Annual, with numerous stems, procumbent or ascending, slender, 

 glabrous; leaves linear, obtuse, tapering at base. 



On sandy sea shores of western and southern Europe, and on the 

 Mediterranean coasts. Sometimes in the interior of Europe. 



Pentacaena ramosissima H. & A. 

 Perennial herb, tufted; prostrate stems forming dense mats, 12 — 45 

 cm. broad, pubescent; subulate pungent leaves crowded on the stems, 

 1 cm. long; silvery-hyaline stipules, % or nearly as long. 



Coast of California. Abundant on dunes at San Francisco and 

 Pacific Grove. 



CHENOPODIACEAE. 



Atriplex Billardieri Hook. f. 



Much-branched herb, prostrate, succulent, spreading, covered with 

 papillas like Mesembryanthemum ; leaves shortly petiolate, ovate, obtuse, 

 entire, 5 — 15 mm. long. 



Sandy beaches near highwatermark. Coasts of Victoria, Tasmania, 

 and New Zealand. 



A. calif ornica Moquin. 



Perennial herb; prostrate stems, wiry, slender, mostly herbaceous, 

 often much branched and forming a thick mat; root cylindrical, large, 

 1 — 3 cm. thick, fleshy; herbage greenish, finely white-mealy or somewhat 

 glabrate in age; leaves thinnish, ovate-lanceolate, 5 — 17 mm. long, sessile 

 or narrowed at base into a short petiole. 



Sandy beaches of California, from San Erancisco to S'an Diego. 



