116 DE CANDOLLE'S SYSTEM. 



U SES . The powerfully scented oil possesses active proper- 

 ties. Ruta graveolens, common Rue, is anthelmintic, sudo- 

 rific, and emmenagogue. Various species of Barosma, called 

 at the Cape of Good Hope Bucku, are powerful antispasmo- 

 dics. The bark of Cusparia febrifuga, called Angostura bark, 

 is a valuable febrifuge ; and that of many other American 

 trees of the order seems to possess the same quality. 



TYPICAL GENERA. Ruta, Boronia, Dictamnus, Correa is 

 remarkable for having a monopetalous corolla. 



47. Xanihoxylacea. Trees or shrubs. Leaves without 

 stipules, with pellucid dots. Flowers unisexual. Calyx in 3, 

 4, or 5 divisions. Petals usually longer than the calyx, convo- 

 lute. Stamens equal to the petals in number, or twice as 

 many. Ovary of the same number of carpels as there are 

 petals, or a smaller number ; ovules 2 ; styles more or less 

 combined. Fruit berried or membranous, sometimes consist- 

 ing of several drupes or 2-valved capsules. Seeds solitary or 

 twin, pendulous, usually smooth and shining; embryo lying 

 within fleshy albumen ; radicle superior. 



USES. Aromatic, pungent, and stimulant. Xanthoxylum 

 Clava Herculis is a powerful sudorific and aperient. The 

 bark of Brucea, of Xanthoxylum caribeeum, and others, is 

 febrifugal. The capsules of some Fagaras are used as pepper. 



TYPICAL GENERA. Xanthoxylum, Ptelea. 



48. Zygophyllacea. Herbaceous plants, shrubs, or trees ; 

 branches often articulated at the joints. Leaves opposite, with 

 stipules, not dotted. Flowers hermaphrodite. Calyx con- 

 volute. Petals unguiculate. Stamens dilated at the base, 

 sometimes placed on the back of a small scale. Ovary with a 

 disk, and 4 or 5 cells ; ovules pendulous or erect ; style 

 simple. Fruit capsular, rarely fleshy, with angles or wings. 

 Seeds few ; radicle superior ; albumen whitish. 



USES. Zygophyllum Fabago is- an anthelmintic. Guaia- 

 cum yields the wood called Lignum Vit, known in turnery 

 for its hardness, and in medicine for its sudorific qualities. 



TYPICAL GENERA. Zygophyllum, Guaiacum. 



49. Simamlacea. Trees or shrubs. Leaves without 



