THE EDITORS MEDICAL BOTANY. 



37 



NINETEENTH CLASS, SYNGENE8IA. 



Chamomile (Anthemis nobilis). 



This perennial plant, which be- 

 longs to the Jussieuan order, Co- 

 rymbifercK, is a native of Britain, 

 flowering in August and September. 

 The calyx is hairy, and has broad 

 membranaceous edges ; the florets of 

 the disk are yellow of the circum- 

 ference, white, and more than five in 

 number; the receptacle is chaffy; 

 the seed is downless. . The dried 

 flowers are the parts used. 



a Florets of the circumference; 

 6, florets of the disk ; c, the recep- 

 tacle, showing the insertion of the 

 two kinds of florets ; d, floret of the 

 circumference, consisting of a single 

 strap-shaped petal; c, floret of the 

 disk ; /, the five stamens, adhering 

 by their anthers, together forming 

 a tube, through which the single 

 pistil, g, passes. 



TWENTIETH CLASS, GYNANDRIA. 



Snake Root, or Birthwort (Aristo- 

 lochia Serpentaria). 



This perennial plant, which be- 

 longs to the Jussieuan order, Aristo- 

 lochice, is a native of North America, 

 flowering in May and June. The 

 flowers, which are brownish purple, 

 grow upon bending foot stalks, from 

 the joints near the root. There is 

 no calyx ; the corolla has one petal, 

 with a triangular lip, and bulging 

 out at the base ; the seed vessel is 

 inferior, with six cells and many 

 seeds. The root, which consists of 

 bundles of yellow fibres, is the part 

 used. 



a The flower ; 6, section of the 

 same, showing the situation of the 

 stamen and pistils, c ; <l, the stamens 

 attached to the pistils, e. 



