OF MABINE COASTS. 121) 



Common in Europe, from Mediterranean to the Arctic, and in 

 Northern Asia. 



J. falcatus Mey. 



Perennial, with slender, creeping rootstock; stems 15 — 25 cm. high, 

 leafy, terete, in compressed tufts. 



Driftsand at Pacific Grove, San Francisco and other places on 

 Californian coast. 



J. mwritimus Lam. 



Perennial, with densely tufted stems, horizontal rhizome, rigid, 6 — 10 

 dm. high, with sheathing scales at base, of which one or two inner ones 

 terminate in a rigid, terete, pungent stem-like leaf, shorter than the 

 real stems; flowers in little clusters. 



In maritime marshes and moist sands on shores of Atlantic North 

 America, Europe from Mediterranean to the Baltic, where rare, Caspian 

 Sea, and in New Zealand, Tasmania, and Australia from Queensland 

 to Western Australia. Also in the interior of Australia. 



XAJADACEAE. 



Najas marina L. 



Slender, branching, submerged plant, with stout stems, often armed 



with prickles twice as long as their breadth; leaves linear, with 6 — 10 



spine-pointed teeth on each margin; the broad sheathing base entire or 



with few teeth on each side. 



Widely distributed in Europe, temperate and tropical Asia, Algeria. 

 North America, West Indies, Brazil, Australia, and Hawaiian Islands. 



Phyllospadix Scouleri Hook. 



Submerged maritime herb, with elongated, narrow-linear, radical 

 leaves, 1.5 — 5 mm. wide, from much-branched, creeping, brittle root- 

 stock. 



Together with another species, R. Torreyi Wats., from which it does 

 not differ essentially in habit, growing on sand covered stones and rocks 

 on the submerged beach of the Pacific coast of North America. 



Potamogeton marinus L. 



Perennial marine plant, with filiform, branched stem; very leafy; 

 leaves narrow-linear, 5 — 15 cm. long, 1 mm. broad. 



In salt water in Europe and North America. Often confused with 

 the following species. 



