UMBELLIFERJE. 



123 



the fruit, oval or more or less didymous, otherwise resembles that of 

 Camm proper in its solitary vittse. The face of the seed is flat or 

 slightly concave. What most generally distinguishes it at a glance 

 from Camm is the great development of the involucral bracts, which 

 are numerous and trisected. The involucels are also formed of 

 numerous bract eoles. They are perennial or biennial herbs of 

 Europe, the Mediterranean region and the north-western African 

 isles. 



In Cicuia (fig. 123, 124), the calyx is more developed, and its 

 small folioles are pointed and incurved. The stylopods are depressed. 



Cicuta rirosa. 



Fig. 123. Fruit (f). 



Fig. 124. Trans, sect, of fruit. 



and the fruit becomes short, sometimes even wider than long, didy- 

 mous. Its transverse section is eUiptic or nearly so, the shorter 

 diameter of the elhpse corresponding to the interlocular partition. 

 The primary ridges are formed by thick columns of the whitish tissue 

 called suberose ; the marginal are prismatic. Interposed there is an 

 equal number of wide vittae, filled with odorous oil-resin. The face 

 of the seeds is flat or convex. They are perennial aquatic glabrous 

 herbs, having flowers collected in compound umbels, with involucres 

 formed of a few bracts or nil. They grow in the northern hemi- 

 sphere of both worlds. 



The genus Sium was one of the most heterogeneous. To it have 

 been referred Camm, Ajniim, &c. It now comprises perennial glabrous 



