EUPHORBIACEAE.  The Herbarium contains thirty-three plants of this very numerous order, whose maximum seems decidedly to exist in India and equinoctial America.  The whole of the Australian species are referable to established Linnean genera, of which Croton and Phyllanthus are most remarkable and numerous, existing on all the intratropical shores of Terra Australis, but by no means limited to them, both genera, together with Euphorbia and Jatropha, being found in the parallel of Port Jackson; and Croton exists likewise at the southern extreme of Van Diemen’s Land, which is probably the limit of the genus on that hemisphere.

A Tragia (scarcely distinct from a species indigenous in India) is sparingly scattered on the East and North Coasts; and Acalypha has been remarked on these, as well as the north-western shores.

PITTOSPOREAE.  Of this small family, whose characters and limits were first described by Mr. Brown, there are sixteen species in the Herbarium of these voyages, referable to Bursaria, Billardiera, Pittosporum, and two unpublished genera.

Billardiera, whose species are wholly volubilous, and which are not found north of the parallel of Port Jackson, is frequent on the South-west Coast, and has been recently remarked on the West Coast of Van Diemen’s Land.  Bursaria on the other hand, appearing limited to New South Wales, has been traced within the tropic to latitude 19 degrees South on those eastern shores, and although the genus Pittosporum is even more extensively diffused on that coast, it has not been met with upon the north-western shores, whilst the islands off the West Coast furnished me with two new species.

DIOSMEAE, although very frequent in the higher latitudes of Terra Australis, where they are so frequent as to give a peculiar character to their vegetable productions, is comparatively rare within the tropic; for upon the East Coast Eriostemon and Phebalium appear to be the only genera, the latter having been recently discovered, in about latitude 20 degrees South.

With some undescribed species of Boronia, a new genus allied to Eriostemon has been observed on the north-western shores, in the parallel of 15 degrees South, having a remarkable pinnatified fimbriated calyx.

Of the related family ZYGOPHYLLEAE (an order proposed by Mr. Brown to be separated from the Rutaceae of Jussieu) Tribulus is frequent on the tropical shores of New Holland, and a species of Zygophyllum, with linear conjugate leaves and tetrapterous fruit, was remarked upon an island off Shark’s Bay, on the West Coast.

MELIACEAE.  The several genera of this order, whose maximum is in the equinoctial parts of America, differ from each other in the form of the remarkable cylindrical nectarium, the situation or insertion of the antherae upon it, as well as the character of its almost wholly capsular fruit.  This structure of nectarium is most striking in Turraea, of which a species was observed upon the East Coast, far within the tropic; where also, as well as on all the other equinoctial shores of the continent, Carapa, more remarkable on account of the valvular character of its capsules, and the magnitude and irregular figure of its nuts, is very general, and probably not distinct from the plant (C. moluccensis, Lam.) of Rumphius, who has given us a figure in his Herbarium Amboinense volume 3 table 61, 62.