DISTRIBUTION OF BRITISH PLANTS. 351 



Those plants limited to the east of England are such as 

 the Pasque-flower (Anemone Pulsatilla), common Mouse- 

 tail (Myosurus minimus), Tower Mustard (Turritis glabrd), 

 a plant called Smooth Sea Heath (Frankenia lavis), though 

 not in any way connected with that family. Jagged Chick- 

 weed (Holosteum umbellatum) , with flowers arranged in um- 

 bels of four or five together ; it grows on walls and roofs 

 about Norwich and at Bury. A species of Knawel (Scler- 

 antJius perennis), rather a poverty-stricken little plant which 

 grows in sandy fields; a species of Southernwood (Artemisia 

 campestris), Crested Cow- wheat (Melampyrum cristatum), 

 two of the Speedwells (Veronica verna and V. triphyllos) , and 

 the Water-soldier (Slratiotes aloides), that pretty flower, with 

 its pure white blossoms, and its bunches of leaves looking like 

 so many heads of Pine-apples floating on the water ; by no 

 means confined however to the eastern counties, being also 

 found in Cheshire and Yorkshire. One more flower is men- 

 tioned as limited to the east of England; a two-leaved 

 Orchis, which (still more unfortunate than the one before 

 mentioned) has had no less than seven different aliases im- 

 posed upon it, to the great mystification of its identity, and 

 the extreme confusion of inexperienced botanists. As those 

 who know it under one name might fail to recognize it under 



