188 



Affinities. Placed hy Mr Brown as a section of Goodenoviae, from which 

 they, in my judgment, differ essentially in their superior 1 -celled ovarium and 

 capitate flowers, thus approaching some species of Dipsaceae, from which they 

 differ in the want of an involucellum, their erect ovulum, superior ovarium, and 

 peculiar stigma. With reference to this, Mr. Brown says : " Brunonia agrees 

 with Goodenovire in the remarkable indusium of the stigma, in the structure 

 and connexion of the anthers, in the seed being erect, and essentially in the 

 aestivation of corolla. It differs from them in having both calyx and corolla 

 distinct from the ovarium, in the disposition of vessels in the corolla, in the fila- 

 ments being jointed at top, in the seed being without albumen, and in its re- 

 markable inflorescence, compatible, indeed, with the nature of the irregularity 

 in the corolla of Goodenoviae, but which can hardly co-exist with that charac- 

 terizing Lobeliaceoe. With Compositae it agrees essentially in inflorescence, in 

 the aestivation of corolla, in the remarkable joint or change of texture in the 

 apex of its filaments, and in the structure of the ovarium and seed. It differs from 

 them in having ovarium liberumorsuperum,in the want of a glandular disk, in the 

 immediately hypogy nous insertion of the filaments, in the indusion of the stigma, 

 and in the vascular structure of the corolla, whose tube has five nerves only, 

 and these continued through the axis of the laciniae, either terminating simply, 

 (as is at least frequently the case in Brunonia sericea,) or (as in B. australis) 

 dividing at top into two recurrent branches, forming lateral nerves, at first sight 

 resembling those of Compositae, but which hardly reach to the base of the la- 

 ciniae. It is a curious circumstance that Brunonia should so completely differ 

 from Compositae in the disposition of vessels of 'the corolla, while both orders 

 agree in the no less remarkable structure of the jointed filament; a character 

 which had been observed in a very few Compositae only, before the publication 

 of M. Cassini's second Dissertation, where it is proved to be nearly universal in 

 the order. In the opposite parietes of the ovarium of Brunonia two nerves or 

 vascular cords are observable, which are continued into the style, where they 

 become approximated and parallel. This structure, so nearly resembling that 

 of Composite, seems to strengthen the analogical argument in favour of the 

 hypothesis advanced in the present paper, of the compound nature of the pistil- 

 lum in that order, and of its type in phaenogamous plants generally; Brunonia 

 having an obvious and near affinity to Goodenoviae, in the greater part of whose 

 genera the ovarium has actually two cells with one or an indefinite number of 

 ovula in each ; while in a few genera of the same order, as Dampiera, Dias- 

 pasis, and certain species of Scaevola, it is equally reduced to one cell anda single 

 ovulum." R. Brown in Linn Trans. 12. 132. The habit of this order is very 

 much that of Globularineae. 



Geography. Natives of New Holland 



Properties. Unknown 



Example. Brunonia 



CLXXX PAPAYACU/i: The Papaw Tribe. 



Papav.k, Agardh Classes. (1824).- Carkek, Thurpin in Atl.dit Diet, des Sc. Nat. (7)— 

 Papayaceje, Von Vlartius H. R M. (1829.) 



Diagnosis Monopetalous dicotyledons, with regular diclinous flowers, and 

 a superior 1-celled ovarium with 5 parietal placentae. 



