CALYCIFLORiE 235 



The fruit is dispersed by water, and wind actuating 

 the water. 



The plant is also called Bottle Brush, Cat's-tail, 

 Cats'-tails, Joint-weed, Knotgrass, Mare's Tail, 

 Paddock Pipes, Paddow Pipe, Witches' Milk. 



HippuRis VULGARIS. — In Fig' 47 tlie habit of the 

 Mare's Tail is shown, also a section of the stem, anthers, 

 and stigma, anthers and stigma in another stage, and the 

 seed and a cross-section of the same. 



Water Milfoil (Myriophyllum spicatnm). 



Like the last plant the Water Milfoil is an aquatic 

 plant, which, however, is entirely submerged, and 

 exhibits in its habit complete adaptation to aquatic 

 conditions. The stem in such plants is limp and weak, 

 thus enabling them to be borne with the current, 

 and to support themselves in this manner, having no 

 w^oody tissue. Many are hollow-stemmed. The leaves 

 are very narrow, linear, finely divided (hence myrio- 

 phyllum), and born in whorls in many cases, an 

 arrangement which gives them, with the long inter- 

 nodes in each whorl, the best conditions for obtaining 

 as much light as possible. Further, proportional to 

 their volume, the leaf surface is large. These plants 

 may be sometimes amphibious. 



The plant is common in most parts of the British 

 Isles. In the Highlands it rises to an altitude of 

 1200 ft. 



The habitat is aquatic, ponds, ditches. The Water 

 Milfoil occurs in the freshwater aquatic formation, 



