iS4 OCHNACEM. [chap. 



It is unifoliolate in the Orange, as in the Barberry. In other 

 Indian genera alUed to the Orange the leaves are pinnate 

 or trifoliolate. Observe, also, the frequently broad wings 

 on each side of the petiole : the translucent dots of the 

 leaves, easily seen when they are held up to the light : also 

 the glandular dots of the flowers ; similar immersed "glands," 

 or receptacles of essential oil, are common to most of the 

 genera of the Family : the cup-shaped disk between the 

 stamens and ovary : the frequent occurrence of two or more 

 exalbuminous embryos in the seeds ; they are found irregu- 

 larly and closely compressed together, so that the cotyledons, 

 normally plano-convex, are much distorted. 



By examining a series of ovaries in different stages, inter- 

 mediate between the flower and fruit, the development of 

 the pulp, which ultimately fills the numerous cells of the 

 fruit, may be observed. It originates in cellular, papillaeform 

 projections from the inside of the outer wall of the ovary. 



The Tribe {Aura^ttiece) of this large Natural Order, to 

 which our type belongs, is characterised by a succulent, 

 indehiscent fruit ; but in other Tribes, including by far the 

 larger number of species, the fruit is dry, often separating, 

 when ripe, into nuts or cocci. 



In Common Rue {Riiia) the capsule is deeply four- or 

 five-lobed. In the climbing shrub Zanthoxylum alatui?i the 

 fruit-carpels are free and dehiscent. The flowers of the 

 last-named are unisexual. 



Besides the Orange and its congeners the Lemon, Lime, 

 Shaddock, and Citron, the Family includes the Bael {/Egle 

 Marmelos) and the Wampi (Clausena Wampi)\ the former 

 is in great repute as a medicine in Southern India. 



26. Natural Order, Ochnacea. — The Ochna Family. 

 Shrubs or trees with alternate, shining, coriaceous, simple, 



