148 
jWoncecia , 
Tetrandria. 
Urtica. ( 1 ) Cal. four-leaved ; cor. none ; rudi- 
ment of the germen cup-formed. (2) Cal. two-leaved; 
Cor. none •, seed one, superior, shining. 
Urt. Urens, Small Nettle ; with opposite, elliptical, 
about five-nerved leaves ; racemes nearly simple. Very 
common in cultivated places. 
Urt. Dioica , Great Nettle; with leaves opposite, 
heart-shaped, racemes much branched, double, flowers 
sometimes dioecious. Common in waste places and 
hedges. 
Buxxjs. Gen. char. — (1) Cal. three-leaved, petals 
two, with the rudiment of a germen. (2) Cal. four, 
leaved, petals three, styles three, caps, three-beaked, 
three-celled. 
Bux. Sempervirens, Box-tree ; on some of the chalk 
hills in England, and well known, as it is employed as 
edgings of borders, for which it is well fitted by its ever-* 
green leaves. The close texture of the wood, and the 
fine polish of which it is susceptible, render its use ex- 
tensive for the purpose of turnery. 
Betura. Gen. char. — (1) Cal. scale of the catkin 
■one-leafed, three-cleft, three-flowered ; cor. four-part- 
ed. (2) Cal. scale of the catkin one- leafed, nearly 
three cleft, two-flowered ; styles two, seeds compress- 
ed. 
Bet. Alba, Common Birch ; with ovate-pointed, ser- 
rated, smoothish leaves ; common in woods. In the 
beautiful variety with pendulous branches, from which 
