INTRODUCTION TO BOTANY. xxiii 



permia^ 5eeds in a capsule, mostly numerous : snapdragon, 

 (Antirrhinum.) 



III. The orders of the fifteenth class are distinguished by 

 the shape of their seed-vessel. 1. Silicidosa, fruit, a poucli or 

 silicle. See Plate, 139. 2. Siliquosa, fruit, a silique, or 

 lengthened pod. See Plate, 138. 



In the classes Monadelphia, Diadelphia, Polyadelpliia, and 

 Gyndndria, the orders are characterised by the number of the 

 stamens ; for example, Pentandria^ &c. 



IV. In the nineteenth class, Syngenesia, the orders are 

 marked by the perfect, separated, harren, fertile, or abortive 

 nature of the florets. 1st order — Polygdmia tequdlis ; florets 

 all perfect, and alike, each producing one seed. See Flora, 

 for examples. 2nd. Polygdmia superfua, florets of the disk, 

 or centre, perfect; those of the- margin or ray, furnished with 

 pistils only, but both kinds of florets producing perfect seed. 

 Srd. Polygdmia frustrdnea, florets of the disk, or centre, per- 

 fect, that is, with stamens and pistils ; those of the margin, 

 with an abortive pistil only, or none at all. See Flora, for 

 examples. 4th. Polygdmia necessdria, florets of the disk, or 

 centre, with stamens only ; those of the margin, with pistils 

 only. See Flora, for examples. 5th. Polygdmia segregdta, 

 several flowers either simple, or compound, but with united 

 anthers, and a proper or peculiar calyx, all included in one 

 general or common calyx. No English plant, for an example. 



V. The orders of the twentieth class, Gyncindria, are 

 distinguished by the number of their stamens; for example, 

 Gyndndria Mondndria, &c. Those of the twenty-first and 

 twenty-second are marked by the stamens also ; including in 

 their orders the classes MonadelpMa, and Polyadelphia. See 

 Flora, for examples, here and elsewhere. 



VI. In the twenty-third class, Polygdmia, are three orders, 

 Monce'cia, Dice'cia, Trio^cia, of which last, there is no British 

 plant known. 



(The orders of the 24th class, Cryptoga'mia, have been 

 already noticed.) 



In the order 1, Monce'cia, the two or three different 

 descriptions of flowers are all on the same plant. 2. In the 



