340 RUTACEiE. [part ii. 



ORDER LIV.— ZYGOPHYLLE^.— THE BEAN-CAPER 

 TRIBE. 



The flowers of the Bean-caper are usually 

 yellow; and the five petals are long, narrow, 

 and placed widely apart. The botanic name 

 of Zygophyllum signifies " with the leaves in 

 pairs," and this is the case to a remarkable 

 degree. Fagonia cretica is a very pretty plant, 

 with purple flowers very much like those of 

 Clarkia ; and Guiacian^ the Lignum Vitse, is 

 remarkable for the hardness of its wood and 

 the gum it produces. Melianthus belongs to 

 this order. 



ORDER LV._RUTACE^.— THE RUE TRIBE. 



This order has been divided into four sec- 

 tions; three of which contain well-known plants, 

 and have been divided into three orders by 

 many botanists. The Rue (Ruta graveolens) is 

 well known from its strong and disagreeable 

 smell, which is produced by the oil secreted in 

 transparent cells in the leaves, which have the 

 appearance of dots, when the leaves are held up 

 to the light. The leaves are of a bluish green, 

 and the flowers of a greenish yellow ; the latter 

 growing in cymes at the end of the branches. 

 There are four sepals, four petals, snd eight sta- 

 mens. There are four carpels, seated on an ele- 

 vated receptacle, and each containing one cell, 



