162 XXIX. RUTACEiE. 



Petals free. Stamens twice as many, free. 

 Calyx inconspicuous or non^. Petals induplicate-valvate, tomentose 



outside 7. Astekolasu. 



Calyx distinct but shorter than the petals. 

 Petals broad, much imbricate, not scurfy, without inflexed tips. 

 Filaments hairy. 



Anthers minutely or not at all apiculate 4. Ebiostemon. 



Anthers tipped with long, horn-like, hairy appendages .... 3. Ceowea. 

 Petals valvate or slightly imbricate, with inflexed valvate tips, glabrous 

 or scaly. 

 Ovary of 5, rarely fewer carpels, the styles attached below the 



middle 5. Phebalium. 



Petals free. Stamens of the same number, free . 16. Geijeba. 



TuiBE II. Zantboxyleae. — Trees or shrubs. Leaves pinnate or S-foliolate with opposite 

 leaflets, or 1-foliolate {truly simple in Geijera), the leaflets usually large. Ovary lobed. Fruit 

 separating into distinct 2-valved cocci. Endocarp persistent, or separating elastically. Seeds 

 Kith or with,out albumen. Cotyledons usually flattened and broader than the radicle. 



Stamens twice as many as petals. 

 Leaves all or mostly opposite. Cocci dehiscent. 



Leaves pinnate. Petals valvate or slightly imbricate. Seeds without 



albumen 9. Bosistoa. 



Leaves 3-foliolate. Petals valvate or slightly imbricate, with inflexed 



lips .10. Melicope. 



Leaves 1-foliolate. Petals large, broadly imbricate, not inflexed . . .12. Medicosma. 

 Leaves alternate, pinnate. Petals valvate. Cocci winged, indehiscent . . 17. Pentaceras. 

 Stamens the same number as petals. Cocci dehiscent. 



Leaves all or mostly opposite, usually 3-foliolate 11. Evodia. 



Leaves simple. Stamens 8. Filaments almost ovate, 4-petaloid, sterile . 13. Bbombya. 

 Leaves simple, or 2 or 3-foliolate. Stamens 10, free, all fertile .... 14. Pagetia. 



Leaves alternate, simple 16. Geijeka. 



Leaves alternate, pinnate 15. Zanthoxtlum. 



(See also Flindersia among MeliaceiB.) 

 Leaves simple. Petals decid,uous. Cocci 5 to 9 18. Pleiocooca. 



Teibe III. Toddaliece. — Trees or shrtibs, with the liabit of Zanthoxylese. Ovary not lobed. 

 Fruit several-celled, indehiscent, or rarely loculicidally dehiscent. Seeds albuminous (in the 

 Australian genus). 



Leaves 1-foliolate. Stamens twice as many as petals 19. Acbonychia. 



Leaves simple. Stamens 10 20. Halfoedia. 



Tkibe IV, AurantieSi — Trees or shrubs. Leaves pinnate, with usually alternate leaflets, 

 or 1-foliolate or simple. Stamens twice as many as petals or more. Ovary not lobed. Fruit 

 indehiscent. Seeds without albumen. 



Leaves all or mostly pinnate. No thorns. 

 Flowers in terminal, flat, corymbose panicles. Filaments subulate 



Petals valvate or nearly so. Cotyledons much folded. Flowers small . 22. MiCBOMELDJr. 

 Petals imbricate, erect. Cotyledons flat. Flowers large . . ... 23. Mureaya. 



Flowers in oblong, pyramidal, or loose axillary or terminal panicles. Fila- 

 ments dilated at the base or middle. 



Ovules solitary. Leaflets few 21. Glycosmis. 



Ovules 2 in each cell. Leaflets numerous .... 24. Clacsena. 



Leaves all simple or 1-foliolate, coriaceous. Thorns axillary. 



Ovary 5 or fewer-celled, with 1 or 2 ovules in each cell 25. Atalantia. 



Ovary 6 or more-celled, with 4 or more ovules in each cell 26. Citeus. 



]. ZIERIA, Sm. 



(After M. Zier.) 



Calyx 4-oleft. Petals 4, imbricate or almost valvate in the bud, spreading. 

 Disk witb 4 distinct gland-like lobes, alternating with the petals. Stamens 4, 

 inserted on the outside of the glands of the disk. Carpels 4, distinct or nearly 

 so ; styles nearly terminal, short and united at least at the top ; stigma capitate, 

 4-furrowed or shortly 4-lobed. Ovules 2 in each carpel, superposed. Cocci 4, 

 2-valved, the endocarp cartilaginous and separating elastically. Seeds solitary. 



