LINXEAN CLASSES AND ORDERS. 47 



*Silicles two-valved, entire or nearly so : 

 Ex. Whitlow-grass, (Draba) and Scurvy-grass, 

 (Cochlearia.) 



^Silicles two-valved, emarginate, notched : 

 Ex. Candy-tuft, (Iberis) and Thlaspi. 



2. SiUquosa is subdivided thus • 



" Calyx closed : 

 Ex. Wall-cress, (Arabis) and Wall-flower, (Chi- 

 ranthus.) 



* Calyx spreading :* 

 Ex. Water-cress, (Sisymbrium) and Mustard, 

 (Sinapis.) 



SIXTEENTH CLASS.— Monodelphia. 



Stamens united by their filaments in one set. 

 Flowers united. Corolla pentapetallous. Orders 8. 



* In Smith's English Flora, the arrangement of the order SiUquosa is 

 according to certain characters in the seeds. 



1st. — Cotyledons accmnheut (0=) the radicle lateral, and applied to 

 the two edges of the seed lobes. 



2nd. — Cotyledons incumbent (OH) the radicle originating from the back 

 of, and applied to, one of the lobes. 



