BOTANY OF TERRA AUSTRALIS. 21 



and Carallia, all of which arc found in the ccjiiinoctial 

 part of New Holland, form a distinct natural order which 

 may be called lihizophorea. This order agrees with Cii- 

 noniaccoc in its opposite leaves and intermediate stipida3, 

 and with great part of them in the aestivation of its calyx, 

 and in the structure and cohesion of the ovarium. From 

 these it differs chiefly in the want of albumen and greater 

 evolution of its embryo. Jussieu^ has combined Rhizo- 

 phora and ]3ruguiera"witli Loranthus and Viscum, neglect- 

 ing some very obvious, and, as they appear to me, im[)ort- 

 ant differences in the flower, and probably never having 

 had an opportunity of comparing the very distinct struc- 

 tures of their ovaria ; the affinity too of Uhizophorca) to 

 Cunoniacese is unquestionable, and it will hardly be pro- 

 posed to unite both these tribes with Loranthus, whicli I 

 consider as even more nearly related to Proteaceac. 



HALORAGE^. The greater part of the genera of 

 which this order is composed, have been referred to Ona- 

 grariae, to certain parts of which they no doubt very nearly 

 approach ; but it must appear rather ])aradoxical to unite 

 Euchsia in the same family with Myriophyllum and even 

 Hippuris, and it would be in vain to attempt a definition [550 

 of an order composed of such heterogenous materials. By 

 the separation of the order here proposed it becomes at 

 least practicable to define Onagrariae. It is still, however, 

 difficult to characterise Halorageae, which will ])robably be 

 best understood by considering as the type of the order the 

 genus Haloragis, froan which all the others differ by the 

 suppression of parts or separation of sexes. Thus Meio- 

 nectes, an unpublished genus of Xew Holland, is reduced to 

 half the number of parts both of flower and fruit. Fro- 

 scrpinaca is deprived of petals and of one fourth of all the 

 other parts. Mj/riopJij/IIum, which is monoecious, has the 

 complete number of parts in the male flower, hut in the 

 female wants both calyx and corolla; what several authors 

 have described as petals being certainly bracteee. 



^ Anuales da 7nus. 12, p. 2S8. 



