302 .XXYIII. RUTACEifi» 



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with glandular pellucid dots on tlie leaves and oilier tliin herbaceous parts. 

 Indumentum usually stellate, if any. Leaves opposite or alternate, simple or 

 compound, entii'e or rarely toothed or lobed. Stipules none. Flowers axillary 

 or terminal, solitary', clustered, cymose, or paniculate, very rarely racemose 

 and seldom if ever spicate. 



A large Order, rangiug over the hotter and temperate regions of the whole world, but 

 chiefly abundant within the tropics, in South Africa atid in Australia. Among the Austra- 

 lian genera, the large tribe of Boroniea is entirely endemic, vvith the exception of one New 

 Zealand and one New Caledonian species. The monotypic genera, Bosistoa^ Medicosma^ 

 and PentaceraSy and the small genus Geijera^ are also endemic. Melicope extends to the 

 Pacific islands, and the remaining genera range over tropical Asia, three of them exteuding 

 into Africa. Zanthoxyhim alone, a wide spread tropical genus, is common to America and 

 Australia, and even here the Australian species belong to the exclusively Australasian section 

 Blackburnia. 



DifTicult as it is to distinguish Eutacecs by well-marked floral or carpological characters 

 from Geraniacea, ZtjgophylletB, or SimaruhecBy they are so readily known by their dotted 

 exstipulate leaves, that the ambiguous genera are remarkably few. They have usually been 

 distributed into 3 or 4 0):il.(^x%, Ruiace^^ (Including or not Biosmem), Zanthoxiflea'.^y,^ 

 AnraHiiecBy upon characters which break down upon a close scrutiny ; the Toddallem 

 being much nearer to the Auranti€(e\h^\). to the Zanthoxylece proper, which again have only 

 vague diiTcrences to distinguish them from Boroniea. We therefore, in our ' Genera Plan- . 

 tarum/ proposed the union of iha whole into 1 Order, divided into 2 series, according as 

 the ovary is lobed or entire, and subdivided into 7 tribes, of which 4 only arc Australian. 



M 

 W 



Trtue I. Boroniese, — Shrubs, very rarely arhoresceut. Leaves simple, Z-foliolate or 

 rarely piiinate, with opposite small leajlets. Ovary lobed. Fruit separating into distinct, 

 2'Va(ved cocci, Endocarp separaUvg elastically. Seeds albuminous. Embryo usually 

 tei'ete. 



Leaves opposite (except in one Zieria) simple or compound. 



Petals 4, united or conniveut in a cylindrical or campanulate * 



corolla. Leaves petiolutc, simple 12. Courea. 



, Petals 4, free, spreading. 



Stamens 4, inserted on 4 prominent glands or lobes of the disk 1. Zieria. 

 Stamens 8. Disk without proniineut glands (excepting B. te- 



irandra) 2. BoKONlA. 



Petals 5, rarely more, free, spreading 3. Ackadenia. 



Leaves alternate, simple. 



. Flowers in dense peduncidate reflexed heads. Stamens much ex- 



sertcd. 



Bracts subulate. Sepals 5. Petals narrow. Leaves lobed . 14. Chokil/ENA. 

 Bracts ovate or lanceolate, numerous and imbricate- Sepals 0, 



Petals very narrow. Leaves entire 15. DifX.ot.*NA. 



(See also Fhebulitan Rahioni.) 

 Flowers distinct or in sessile, erect heads. 



Petals united or ronnivnit in a tubular corolla 13. NEMATOLKris. 



Petals free. Stamens twice as maiiv, monaddphons 



Stamens all perfect . . . . ' '. . , . 9. Piiilotheca. 



Stamens 5 perfect, 5 without anthers 10. DkumaiuXIUTA. 



Petals free. Stamens twice as many, free. 



Calyx inconspicnons or none. 'PutalJ iuduplicate-valvate, 



tomcntose outside , ... 11. Asterolasia, 



Calyx distinct but shorler than the petals. 



Petals broad, much imbricate, not scurfy, without inflexed 

 tips. Filaments hairy. 



Anthers minutely or not at all npiculate 6. Eriostemon. 



Anthers tipped with long, horn-like, hairy ax>pendages . 4. Ckovvea. 



