OF MARINE COASTS. 141 



Ammophila arenaria, for which it is a substitute on the dunes of the 

 Iberian Peninsula. 



It occurs on sandy tracts everywhere in the western parts of the 

 Mediterranean. A closely allied species, 8. arenaria Brot., is found on 

 similar localities in Spain and Portugal. 



8. teretifolia Steud. 



Perennial; stems in dense tufts, 45 — 75 cm. high; leaves long, 

 slender, terete. 



On middle beach and in salt marshes on coasts of Australia (Western 

 Australia to Victoria), Tasmania, and New Zealand. 



Thuarea sarmentosa Pers. 

 Creeping and rooting perennial, forming short tufts; leaves flat, 

 lanceolate, 3 — 5 cm. long, densely silky-pubescent on both sides. 

 On sandy beaches in the tropics from Madagascar to Samoa. 



Zoysia pungens Willd. 



Ehizome creeping; stems erect, 5 — 15 cm. high; leaves flat or con- 

 volute, with rigid, pungent points, glabrous; spike terminal. 



Coastal sands of tropical and Eastern Asia, New Zealand, Tasmania, 

 and Australia, from Moreton Bay to Victoria. 



OPHIOGLOSSACEAB. 

 OpMofflossum arenarium E. G. Britton. 

 Bootstock slightly thickened, with 1 or 2 stalks, stem rigid, erect, 

 5 — 17 cm. high, bearing the sessile lanceolate fleshy leaf below the 

 middle; blade 2 — 5 cm. long, acute or apiculate. 



Gregarious in a colony of many plants in" sandy ground under trees 

 at Holly Beach, New Jersey. (Bull. Torr. Bot. CI. 24: 555. 1897.) 



0. vylgatum L. 



Perennial rootstock; stem single, 8 — 15 cm. high, with one oblong, 

 entire leaf, 5 — 8 cm. long, narrowed into a sheathing footstalk. 



Although not confined to -the coast this plant is often found on in- 

 undated sands in the Finnish Archipelago, and on the Swedish east 

 coast. 



