244 CLASS MONADELPIIIA. 



SUiculosa. 



The First Order contains plants which produce a short and 

 round pod called a sillicula ; a distinction in this order is made 

 between such plants as have pods with a notch at the top, and 

 such as have none, or are entire. 



The pepper grass (Lepidium), and the shepherd's purse 

 (Thlaspi), afford examples of this order. At Fig. 118, d, is 

 a representation of the sillicula or pod of the Thlaspi. The 

 plants found here, belong to the natural family Siliquosa, the 

 properties of which are nutritious and medicinal. 



tSiliquosa. 



The Second Order contains such plants as have long and 

 narrow pods ; as the radish and mustard. The cabbage (Bras- 

 sica), is an exotic ; the turnip is a species of the same genus. 

 These belong to the same natural family as the plants of the 

 first order. The whole are included under the 63d order of 

 of Jussieu, the Crucifera. This order is in Jussieu's 13th 

 class, having seeds dicotyledonous, corollas polypetalous, and 

 Stamens hypogynous. 



At Fig. 118, fl, is the wall-flower (Cheiranthus) ; the calyx 

 consists of four oblong leaves ; the petals are obovate, spread- 

 ing, with claws as long as the calyx. At , appear the six 

 Stamens divested of the petals ; the germ is cylindrical, as long 

 as the stamens ; c, shews the silique or pod ; the valves are 

 concave and a thin membranous partition divides the silique 

 into two parts. 



In this lecture we have pointed out to you the most important 

 characters of the two classes, which depend upon considera- 

 tions derived from the number and comparative length of the 

 stamens ; the one class having four and the other six stamens 

 of varying lengths. Both classes we found to have two or- 

 ders, not as in the preceding classes, depending upon the styles ; 

 but in the one class, on the situation of the seed as lying in the 

 calyx, or enclosed in a seed vessel ; in the other class, from 

 the comparative length of the pericarp or pod. 



LECTURE XXXIII. 



CLASS XV MONADELPHIA. 



WE are now to consider the brotherhoods, as the names of 

 the 15th and 16th classes signify; Monadelphia meaning one, 



Order SUiculosa Order Siliquosa Recapitulation The Brotherhoods. 



