58 SPIRiEEjE. [part i. 



with the Raspberry in the construction of their 

 fruit, though they differ in the number of their 

 leaflets, the size and colour of their flowers, and 

 other minor particulars. 



Several other genera belong to this tribe, 

 among which may be mentioned Geum Aveiis^ or 

 Herh Bennet^ the carpels of which have each a 

 hooked style; Sieversia separated from Geum, 

 because the carpels end in a straight feathery 

 awn ; and Tormentilla^ the flowers of which bear 

 a general resemblance to those of Potentilla, 

 but which have an eight-parted calyx; a corolla 

 of four petals; sixteen stamens, and dry wrinkled 

 carpels on a depressed receptacle. All these 

 genera my readers will find it interesting to 

 procure flowers of, in order to compare them 

 with each other. This and the preceding tribe 

 are considered by some modern botanists to 

 form the order Rosacese ; the other tribes being 

 formed into separate orders. 



TRIBE III.— SPIRiEE^. 



The only genera in this tribe which contain 

 well-known plants are Spiraea and Kerria. 

 In Spirsea the calyx is five-cleft (see a in Jig, 

 24) and lined with the dilated receptacle, forming 

 a shallow tube or rather cup for the reception 

 of the carpels. There are five small roundish 



