CHAP. I.] RUTACE^. 341 



whichgrow into a four-celled fruit. InFraxinella 

 {Bictamnus) the petals are unequal ; there are 

 ten stamens, one style, and the carpels are 

 two-seeded. In Diosma there are only five 

 stamens, the style is arched, and the capsule 

 consists of five-horned cai'pels. In Corrsea the 

 leaves are opposite ; there are eight stamens, 

 and the four petals grow together into a tube 

 at the base ; and in Crowea there are five 

 sepals, five petals, and ten stamens ; the leaves 

 are also alternate. The Diosmas have as strong 

 a scent as the Rue, and a perfume is made from 

 them called Bucku at the Cape of Good Hope, 

 of which country they are natives. 



The section Zanthoxylese contains the Zan- 

 thoxylum, also called the Toothache Tree, or 

 Prickly Ash, a native of North America, the 

 bark of which is very fragrant, and is said to be 

 a cure for toothache and rheumatism ; Ptelea 

 or Shrubby Trefoil ; and Ailantus glandulosa. 

 Zanthoxylum fraxineum has very pretty pinnate 

 leaves, and small purple flowers ; Ptelea trifo- 

 liata has curiously winged fruit, which resemble 

 those of the elm ; and the Ailantus has re- 

 markably long compound leaves, one leaf having 

 been known to have fourteen pairs of leaflets, 

 and to be upwards of three feet long. The two 

 following orders are included in Rutacese by 

 some botanists. 



