BORAGINEAE.  Some very important amendments, in reference to the limits of certain genera of the order have been proposed by Mr. Brown in his Prodromus, where the characters are remodelled to the exclusion of certain species previously referred to them by authors.  Of Cordia (to which Varronia of Linne, and Cerdana of Ruiz and Pavon, have at length been united) only two species have been found in Terra Australis, of which one had been previously discovered in New Caledonia; and during the late voyages C. orientalis has been observed on the North-west Coast, where a third species of Tournefortia in complete fructification was discovered; and the Herbarium contains some species of that section of Heliotropium, having a simple straight spicated inflorescence, which were also found on those equinoctial parts of the continent.

BIGNONIACEAE.  Almost ninety species of this beautiful order are described by authors, the greater part of which are at present incorporated among the genuine species of Bignonia of Linne; a genus that will hereafter be divided, according to the shape of the calyx, the number of fertile stamina, and more especially the form of the fruit (which in some species is an orbicular or elliptical capsule, varying in others to a long cylindrical figure, with seeds partly cuneated, or thickened at one extremity, and in others, a truly compressed Siliqua) together with the relative position of the dissepiment, in respect to the valves of the fruit.

The greater portion of Bignoniaceae appears to exist in the equinoctial parts of America; Some, however, are natives of India, and a few occur on the western coast of Africa, and Island of Madagascar, but in Terra Australis the order is reduced to four plants, of which one is a recent discovery, and may be referred to Spathodea.  In that continent, the order exists only upon the North and East Coasts; it is not, however, entirely limited to the tropic, for Tecoma of Mr. Brown is also found in latitude 34 degrees South, on which parallel it has been traced at least three hundred and fifty miles in the interior to the westward of the colony of Port Jackson.

ASCLEPIADEAE and APOCINEAE.  Nearly the whole of the plants in the recently formed herbarium, that belong to these natural families, have been described from specimens formerly discovered upon the East and North Coasts, several of which appear to give a partial character to the vegetation of some parts of its shores.

Hoya (hardly Asclepias carnosa of Linne) Cynanchum, Gymnema, Gymnanthus, Sarcostemma, and probably Secamone, as belonging to Asclepiadeae, and all the genera of Mr. Brown (Lyonsia excepted) referred to the latter order, exist on that extensive coast, where Balfouria and Alyxia have each an accession of species.  Of Strychnos, which is also frequent, and probably produces its flowers during the rainy season (as has been remarked of this genus in other countries) specimens in that stage of its fructification are still a desideratum; all that is known respecting the plant being the form and size of its fruit, which in some species varies considerably.