STRUCTURE.] 



STAUNTONIA EUONYMUS. 



213 



vascular system are separated. This vacancy is nearly filled 

 with bark, which projects into the cavity. 



Jiff. 38. 



In Stauntonia latifolia, (fig. 39.), which has a twining 

 stem, there are no concentric circles, and the medullary rays 

 are curved, part from right to left, and part from left to right, 



fig. 39. 



diverging at one point and converging at another : the bark 

 is pierced with extensive longitudinal perforations. 



In Euonymus tingens (fig. 40.), the vessels near the centre 

 of the stem are arranged in concentric interrupted circles, 

 but towards the bark there is no trace of such circles ; the 

 surface of the stem is deeply cut into lobes parallel with the 

 stem, and the vessels are all confounded in an uniform mass. 



Gaudichaud represents the stem of some Malpighiaceous 



