ORGANS OF REPRODUCTION. 225 



as in the Pimpernel {AnagalUs) {fig. 443), when the calyx is said 

 to be partite ; or it may take place to about the middle, as in 

 the Centaury {Erythrcea) {fiy. 444), when it is cleft ox fissured ; 

 or the sepals may be united almost to the top, as in the Lychnis 

 {fig. 445), when it is toothed; or if the union is quite complete, 

 as in the Chrysanthemum {fig. 450), and some Correas, it is 

 said to be entire. The number of partitions, fissures, or teeth, 

 is indicated by the same prefixes, as those previously re- 

 ferred to as being used in describing analogous divisions in the 

 blade of a leaf ; thus the above calyx where the divisions 

 are five, would be described as five-parted or quinquepartite, 

 five-cleft or quinquefid, five-toothed or quinquedentate, according 

 to the depth of the incisions. In like manner the terms tripar- 

 tite, trifid, or tridentate, would indicate that a calyx was 

 three-parted, three-cleft, or three toothed, and so on. The 

 number of divisions in the majority of cases corresponds to the 

 number of component sepals in the calyx, although exceptions 

 to this rule sometimes occur, as for instance in those cases 

 where the divisions are themselves divided into others ; a little 

 care in the examination will, however, generally enable the ob- 

 server to recognise the primary from the secondary divisions. 

 When a monosepalous calyx is entire, the number of sepals 

 can then only be ascertained by the venation, as the principal 

 veins from which the others diverge generally correspond to 

 the midribs of the component sepals. In a monosepalous calyx 

 in which the union exists to some extent, the part where the 

 sepals are united is called the tube, the free portion, the limb, 

 and the orifice of the tube, the throat ov faux {fig. 446). 



If the union between the sepals is unequal, or the parts are of 

 different sizes, or of irregular form, the calyx is said to be irre- 

 gular {fig. 447) ; if, on the contrary, the parts are alike in form, 

 of the same size, and united 



so as to form a symmetrical Fig. 446. Fig. 447. 



body, it is regular {fig. 445). 

 Some forms of the irregular 

 and regular calyx have re- 

 ceived special names. Thus 

 in the Dead-nettle {Lamium) 

 {fig. 447), &c., the irregular 

 calyx is said to be bilabiate 

 or two-lipped, because the five 

 sepals of which it is composed 

 are united in such a manner 

 as to form two lips. Of the 



regular forms of the mono- ^ig- +4(5. UrceoUte calyx of Henbane 



1 1 V. „ {Hf|oscyam^ts^ J^tV;. 447. Bilabiate 



Sepalous calyx, a number are calyx of the Dead -nettle (Zanuum). 



distinguished under the 



namesof^u6uZar, bell- shaped or campanulate, urceolate orpitchcr- 

 Q 



