Lir. AUEANTIACB^. 



319 



Orange. 



Transverse section of 



fruit. 



Orange. Orange. Bergera. 



Calyx and Calyx and Plower without 



androecium (mag.), pistil (mag.). corolla (mag.). 



Bergera. Bergera. 



Vertical section of Pistil 



ovary (mag.). (mag.). 



Orange. Seed, entire and cut (mag.). 



Petals hypogynous, cestivation imbri- 

 cate. Stamens hypogynous, double or 

 multiple the number of the petals, free, 

 monadelphous or polyadelphous. OvABT 

 several-celled. Ovules 1-2 or more in each 

 cell, pendulous or horizontal, ana.tropous. Fruit a l-m,any-seed6d berry. Embryo 

 exalbuminous. — Stem woody. Leaves alternate, imparipinnate or 1-foliolate. 



Trees or shrubs, usually glabrous; bark, leaves, calyx, corolla, filaments and 

 epicarp covered with vesicles containing a volatile oil. Leaves persistent, alternate, 

 compound, often 1-foliolate by suppression, witb the leaflet jointed, or the top an 

 often winged petiole ; stipules ; buds axillary, the outer often spinescent. 

 Flowers generally 5 , regular, terminal, solitary, or corymbose or racemed. Calyx 

 short, urceolate or campanulate, 4-5-toothed or -fidj rarely 3-fid {Triphasia), some- 

 times nearly entire, imbricate in sestivation, marcescent. Petals inserted below 

 the ovary at the base of a stipitiform, annular or cupuliform disk, free or slightly 

 connate at the base, imbricate in sestivation, deciduous. Stamens inserted on the 

 receptacle, double or multiple the number of the petals ; filaments free, or mona- 

 delphous at their base or to the middle, or polyadelphous, linear-subulate, usually 

 dilated, thinner above, equal or the alternate shorter ; anthers introrse, dorsi- or basi- 

 fixed, incumbent, dehiscence longitudinal. Ovary free, sometimes girt by the 

 cupuliform disk, 5-many-celled ; style terminal, simple, stout ; stigma capitate, 

 undivided or lobed ; ovules inserted at the inner angle of the cells, solitary or 2, 

 collateral or superimposed, or numerous and 2-seriate, pendulous or rarely hori- 

 zontal, anatropous. Berry fleshy or dry, bark thick, indehiscent, of 2 or several 

 usually 1-seeded cells filled with mucilage or vesiculose cellules. Seeds inverted or 

 sub-horizontal, testa membranous, raphe branching, chalaza coloured ; albumen 0. 

 Embryos (sometimes several in each cell) straight ; cotyledons either fleshy, amyg- 

 daloid, plano-convex, often unequal, or thick, green, lobulate, auricled ; radicle short, 

 near the hilum, superior. 



* Triphasia. 



PEINCIPAL GENERA. 

 *Limonia. *Murraya. *Cookia. 



"Citrus. 



