300 



PETAL0IDE. 



Ruppia Maritima 

 (Sea Ruppia) 



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 {Homed Pond-weed) 



1. Z. palustris (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) 



1. 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 used as beds, and are 

 also employed in packing glass. Fl. 

 July, August. Perennial. 



Zostera Marina 

 (Grass-wrack) 



Helleborine latifolia (Broad-leaved Ilelleborine) 1-3 ft. ; flowers 

 green with red lip in loose raceme. Perennial. Flowers in August 

 in woods. H. alba (White H.) 1-2 ft. ; flowers milky white, cup- 

 shaped. Perennial. Flowers in June. Woodson chalk. H. palustris 

 (Marsh H.) I ft. ; green sepals striped with red ; bracts shorter 

 than flowers. Marshy ground. Perennial. Flowers in July and 

 August. 



