APPENDIX. No. V. 443 



Of the two generic names given by M. du Petit Thouai-s, and published 

 somewhat earlier than M. de Candolle's Memoir, Leucosia will probably be 

 considered inadmissable, having been pre\dously applied bv Fabricius to a 

 genus of Crustacea; and Dichapetaliun is perhaps objectionable, as derived 

 from a character not existing in the whole genus, even allowing it to be really 

 polypetalous. It seems expedient therefore to adopt the name proposed by 

 M. de Candolle, who has well illustrated the genus in the memoir- refen-ed to. 

 It appears to me that Chailletia, a genus nearly related to it from India with 

 capsular fruit, and Tapura of Aublet (which is Rohr'ta of Schreber,) form a 

 natural order, very different from any yet estabhshed. The principal characters 

 of this order may be gathered from M. de Candolle's figure and description of 

 Chailletia, to which, however, must be added that the cells of the ovju-ium, 

 either two or three in number, constantly contain two collateral pendulous 

 ovida ; and that in the regular flowered genera there exist witliin, and opposite 

 to, the petal Uke bodies an equal number of glands, which are described by 

 M. du Petit Thouars in Dichapetalum, but are unnoticed by him in Leucosia, 

 where, however, they are equally present. 



It may seem paradoxical to associate ^vith these genera Tapura, whose flower 

 is irregular, trianckous, and apparently monopetalous. But it wiU somewhat 

 lessen then- apparent differences of structure to consider the petal-like bodies, 

 which, in all the genera of this order, are inserted nearly or absolutely in the 

 same series with the filaments, as being ban-en stamina ; a view which M. dc 

 Candolle has taken of those of Chailletia, and which M. Richard had long 

 before pubhshcd respecting Tapura.* It is probable also that M. de Candolle 

 at least will admit the association here proposed, as his Chailletia sessiliflora 

 seems to be merely an unperfect specimen of Tapura guianensis. 



The genera to which Chailletese most nearly approach appear to me to be 

 Aquilaria of Lamarck -f- and Gyrinops of Gsertner. But these two genera 

 themselves, which are not referable to any order j'et established, may either be 

 regarded as a distinct family, or perhaps, to avoid the too great multiplication 

 of famihes, as a section of that at present under consideration, and to which I 



* Diet. Elan, de Bolanique par Bulliard, revii par L. C. Richard, ed. 1802, /(. 3-*. 

 + Or Ophiospermum of tlie Flora Cochincbinensis, as I have proved by comparison 

 with a specimen from Loureiro himself. 



