SECT. I. ORGANOGRAPHY AND GLOSSOLOGY. Q3 



into a tube, and the calyx is then " monosepalous, " 

 or " monophyllous," or more correctly " gamosepalous." 

 In proportion as this cohesion extends from the base 

 towards the apices of the sepals, the several modifi- 

 cations which it presents receive different appellations. 

 It is termed " partite," when the cohesion extends but 

 a short way; "divided," when it reaches about half- 

 way up; "toothed," when it is nearly complete; and 

 "entire," when the sepals are completely united to the 

 very summit. In this last case, the number of the 

 sepals can only be ascertained by their venation, each 

 separate sepal being indicated by the position of its 

 midrib ; but in the other cases, which are most usual, 

 the free apices of the sepals readily point out their 

 number. Some sepals are so firmly united by their 

 apex into one piece, that no separation 

 takes place in this part, as the corolla 

 enlarges. The calyx is then ruptured 

 round the base, or transversely across 

 the middle, and is thrown off in the 

 form of a little cup, as in Eucalyptus 

 (fig- 90.). When the cohesion is more 

 perfect between some sepals than others, so as to form 

 two lobes to the calyx, it is termed ec lipped." An 

 analogy is frequently maintained be- 

 tween sepals and the leaves, in such 

 plants as bear stipules. This is indicated 

 by the presence of little scales, re- 

 sembling bracteae, seated on the outside 

 of a monosepalous calyx, and alternating 

 with the sepals themselves, as in Poten- 

 tilla (fig. 91.). 



(95.) Corolla. The petals are generally even less 

 leaf-like than the sepals, more highly coloured, and 

 more variously modified in shape. Like the sepals, 

 they are either free, or cohere by their edges, forming a 

 "monopetalous" corolla. In many cases, the petals may 

 be divided into two parts the " claw," which is ana- 

 logous to the petiole of the leaf; and the "limb," which 



