30O 



RuppiA Maritima 

 (Sea Ruppia) 



PETALOIDEiE 



necessary to describe their characters 

 in an elementary work like this. 



2. Ruppia 



I. R. maritima (Sea Ruppia). — The 

 only species, growing in salt-water 

 ditches ; distinguished from Potamo- 

 geton pusillus by its spiral flower-stalks 

 and long-stalked fruit. — Fl. July, Au- 

 gust. 



3. Zannichellia {Horned Pond-weed) 



I. Z. falustris (Horned Pond- weed). 

 • — The only British species. A sub- 

 mersed aquatic, with the habit of 

 Potamogeton -pusillus, from which it 

 may be well distinguished by its small, 

 almost sessile, axillary flowers, the 

 stigmas of which are unevenly cup- 

 shaped. — Fl. August, September. Peren- 

 nial. 



4. ZosTERA (Grass-wrack) 



I. Z. marina (Grass - wrack). — A 

 submersed marine aquatic, with long, 

 cord - like stems, and bright green, 

 grass-like leaves, some of which serve 

 as sheaths to the bead -like rows of 

 small, simple flowers. The dried leaves 

 and stems are iised as beds, and are 

 also employed in packing glass. — Fl. 

 July, August. Perennial. 



ZcsTRRA Marina 

 (Gfass-wrack) 



THE END 



