£0 DIFFERENT STRUCTURES OF CALYX. 



in most plants serrate, sawed, as in some species of Hypers 

 cum ;...or ciliate, fringed with hairs, like an eye-lash, as in some 

 species of Centaurea. 



In respect to its apex, or top, it is either acute, sharp, as in 

 Primula, and Ammosxcv;... acuminate, pointed, as in Hyoscya- 

 mus;... obtuse, blunt, as in Nymph^a, and Garcinia ;...or with one 

 of its indents lopped off, as in Verbena. 



In respect to Proportion, it is either longer than the corolla, 

 as in Agrostemma, Sagina, and some species of Antirrhinum ;... 

 equal to it, as in some species of Cerastium ;.,.or shorter, as in 

 Silene. 



In respect to Situation, it is either a calyx of the flower, as 

 in LiNN^EAand MoRiNA;...of the fruit, as in Linnjea and Morina*; 

 ...or of the fructification, as in P^eonia. 



The Duration of the calyx may also be considered. In re- 

 spect to which it is either caducous, falling off at the first opening 

 of the flower, as in Papaver and "EpmEViuw;... deciduous with 

 the corolla, as in Berberis, and in the plants of the class lh» 

 tradynamia-f or persisting, till the fruit is come to maturity, as 

 in the plaints of the class Didynamiai. 



VARIATIONS OF AN INVOLUCRUM. 



The preceding varieties of the calyx chiefly respect a peri- 

 anthium. An involucrum is either monophyllous, as in Bupleu- 

 rum ;..,diphyllous, as in Euphorbia ;.»»triphyllous, as inBuTOMUs 

 and Alisma ^...tetr aphyllous, as in Cornus ;„.pentaphyllous, as in 

 DAUcus;...or hex aphyllous, as in Hjemanthus. 



* The Lrnncea and Marina have each of them two calyxes, one of the flower, 

 the other of the fruit ; which is the reason of their being given as instances of both 



cases. 



t See Part II. Chap. XVIII, % See Part II. Chap, XVII.' 



