226 MONOSEPALOUS OR GAMOSEPALOUS CALYX. 
so on. The number of divisions in the majority of cases 
corresponds to that of the component sepals of which the calyx 
is formed ; although exceptions to this rule sometimes occur, 
as for instance in those cases where the divisions are themselves 
Fie. 458. Fie. 459. Fie. 460, 
Fig. 458, Partite inferior calyx of the Pimpernel (Anagallis).—— Fig. 459. 
Cleft or fissured calyx of the Centaury (Hrythrea).—Fig. 460, Dentate 
or toothed calyx of Campion (Lychnis), 
divided into others. A little care in the examination will, 
however, generally enable the observer to recognise the primary 
from the secondary divisions. When a monosepalous calyx is 
entire, the number of sepals can then be ascertained by the 
Fie. 461. Fic. 463. 
TOM 
Fig. 461, Urceolate calyx of the Henbane (Hyo- 
scyamus ),——Fig. 462. Bilabiate calyx of the 
Dead-nettle (Lamium).—VFig. 463. Vertical 
section of the flower of the Myrtle (Myrtus 
communis). cal, Tube of the calyx adherent 
to the ovary, 0, s, Stamens, 
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 in a marked 
degree, the part where the sepals are united is called the tube, 
the free portion the limb, and the orifice of the tube the throat 
or faux (figs. 460-462). 
