84 THE STORY OF PLANT LIFE 



In waters poor in mineral salts, as in lowland and 

 highland lakes, etc., are found Quillwort, Water 

 Lobelia, Awlwort, Pillwort, Shoreweed, Floating 

 Bur Reed. 



The submerged species of the highland loch vegeta- 

 tion include Bladderwort, many Pondweeds, J uncus 

 bulbosus, Eleocharis acicularis, Scirpus fluitans, etc. 



Amongst those plants with floating leaves are in- 

 cluded White Water Lily, Yellow Water Lily, Apium 

 inundatum, Amphibious Knotgrass, and in the reed 

 swamp grow Bogbean, Common Spike Rush, Bul- 

 rush, Prickly Twig Rush, Sedges, Reed, etc. 



In quickly flowing streams the water may be 

 non-calcareous and such associations include Lenor- 

 mand's Water Buttercup, Ivy-leaved Water Crow- 

 foot, Glyceria fluitans. Star wort, Water Blinks, Bog 

 Stitchwort, etc. Where the water is calcareous other 

 types are found (see Fig. 20). 



The marsh formation is characterised by an asso- 

 ciation of Alders and Willow with also Elm, Ash, 

 Oak, Guelder Rose, Birch, Field Maple, and Creeping 

 Buttercup, Pilewort, Marsh Marigold, Water Cress, 

 Cuckoo Flower, Ragged Robin, Square-stalked St. 

 John's Wort, Golden Saxifrage, Great Hairy Willow 

 Herb, Small-flowered Willow Herb, Marsh Bedstraw, 

 Cleavers, Valerian, Marsh Thistle, Creeping Jenny, 

 Comfrey, Tufted Scorpion Grass, Marsh Forget-me- 

 not, Figwort, Brookweed, Skullcap, Great Water 

 Dock, Marsh Helleborine, Spotted Orchis, Yellow 

 Flag, Wood Club Rush, Panicled Sedge, Pendulous 



