1893.] Oh King — Materials for a Flora of the Malayan Peninsula. 205 



Order XXIII. RUTACE.E. 



Trees or shrubs, rarely herbs, abounding in pellucid glands filled 

 with essential oil. Leaves opposite or alternate, simple or compound, 

 exstipulate. Floivers in axillary or terminal cymes or panicles, never 

 spiked, usually bisexual and regular in the Indian species. Calyx 

 of 4-5 small lobes or sepals. Petals 4-5, hypogynous (in the Indian 

 genera), valvate or imbricate. Stamens 4-5 or 8 or 10, rarely more 

 (Citrus, JEgle) ; filaments usually free, hypogynous; anthers 2-celled, 

 opening inwards. Disc within the stamens, crenate or lobed, some- 

 times large or long. Ovary of 4-5 free or connate carpels ; styles 

 as many, free or variously united ; stigmas terminal, entire or lobed ; 

 ovules usually 2 in each cell. Fruit a capsule, berry or drupe, or 

 1-4 capsular cocci. Seeds usually solitary in the cells, testa various, 

 albumen fleshy or ; embryo straight or curved, radicle superior. — 

 Distrib. Tropical and extratropical. Genera 83, and about 70 species. 

 Ripe fruit separating into dehiscent cocci or 

 follicles. 



Flowers generally unisexual ; disc free or 

 absent ; ovaries partially united ; styles 

 basilar or ventral, free at the base ; cells 

 2-ovuled. 



Leaves opposite. 



Stamens 4 or 5 



Stamens 8, four perfect opposite 



the sepals, alternating with four 



imperfect opposite the petals... 



Stamens 8, all perfect 



Leaves alternate, stamens 3 to 5 ... 



Ripe fruit indebiscent. 



Flowers polygamous : petals 4, stamens 8 ; 

 disc free : ovaries and styles 4, united, 

 the cells 2-ovuled ; fruit syncarpous, 

 4-celled, indehiscent, seed albumiuous ; 

 leaves 1-foliolate 

 Flowers hermaphrodite, petals and sta- 

 mens free or connate, ovaries and 

 styles completely united, cells 1-to many- 

 ovuled : fruit a berry, sometimes with 

 but little pulp, seed exalbuminous 

 Unarmed. 



Style short, persistent ; leares 



1 to 5-foliolate ... ... 6. Glycosmis, 



1. Fvodia. 



2. Tetractomia. 



3. Melicope. 



4>. Zanthoxylum. 



5. Acronychia. 



