LII. AURANTIACE^L 



319 



Orange. 



Transverse section of 

 fruit. 



Orange. 



Calyx and 



andrceciura (mag.). 



Orange. 



Calyx and 



pistil (mag.). 



Bergera. 

 Flower without 

 corolla (mag.). 



Bergera. 



Vertical section of 

 ovary (mag.). 



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



PETALS hypogynous, aestivation imbri- 

 cate. STAMENS hypogynous, double or 

 multiple the number of the petals, free, 

 monadelphous or polyadelphous. OVARY 

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



cell, pendulous or horizontal, anatropous. FRUIT a ~L-many-seeded berry. EMBRYO 

 exalbuminous. STEM woody. LEAVES alternate, imparipinnate or \-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, with the leaflet jointed, or the top an 

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

 FLOWERS generally $ , regular, terminal, solitary, or corymbose or racemed. CALYX 

 short, urceolate or campanulate, 4-5- toothed or -fid, rarely 3-fid (Triphasia], some- 

 times nearly entire, imbricate in aestivation, marcescent. PETALS inserted below 

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

 'connate at the base, imbricate in aestivation, 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. 



PRINCIPAL GENERA. 

 *Limonia. *Murraya. *Cookia. 'Citrus. 



