Narrative of a Survey of the Intertropical and Western Coasts of Australia — Vol. 2 / Performed between the years 1818 and 1822

by Philip Parker King

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.

GOODENOVIAE. The Herbarium contains very few specimens of this considerable Australian family, the greater mass existing in and to the southward of the parallel of Port Jackson. The order is reduced to Goodenia, Scaevola, Velleia, and the tropical Calogyne on the North-west Coast, and the few species of the two first genera prove to have been formerly discovered upon the South Coast during the voyage of Captain Flinders, of which one plant has alsa a much more extensive range than has been given it heretofore. It is Scaevola spinescens, which forms a portion of the harsh, rigid vegetables of Dirk Hartog's Island on the West Coast, and from that shore probably occupies a part of a very considerable extent of barren country in the interior, in a direction towards the East Coast, having been seen in abundance in the latitude of Port Jackson, so near that colony as the meridian of 146 degrees 30 minutes East. A new Velleia, discovered on the North-west Coast in latitude 16 degrees, augments that genus, belonging to the section with a pentaphyllous calyx.

RUBIACEAE. The existence of several plants of this extensive family in the intratropical parts of Terra Australis especially when aided by some individuals of almost wholly exotic tribes, that form a prominent feature in the Flora of other equinoctial countries, tend, in some measure, to diminish the peculiar character of the vegetation of Terra Australis on those shores, and thus it is a considerable assimilation to the Flora of a part of a neighbouring continent that has been traced. About thirty species are preserved in the collections of these voyages, for the most part belonging to genera existing in India, but more abundant in the tropical parts of South America.

Of these, Gardenia, Guettarda, Cephaelis, Coffea, Psychotria, and Morinda, are found on the East Coast; whilst, in corresponding parallels on the opposite, or north-western shores, the order, although not materially reduced, is limited to the two latter genera, with Rondeletia, Ixora, and Genipa.

It is worthy of remark, that the range of Psychotria, which has not been observed beyond the tropics in other countries, extends in New South Wales as far south as the latitude of 35 degrees; at the western extremity of which it does not appear to exist.

CAPRIFOLIAE, Juss. The situation of Loranthus and Visvum, in the system, appears to be undetermined by authors. M. Jussieu associated them with Rhizophora, in the second section of this order, from which Mr. Brown has separated this latter genus, and with two others found in Terra Australis, has constructed a distinct family, named Rhizophoreae; suggesting, at the same time, the analogy of Loranthus and Viscum to Santalaceae, and particularly to Proteaceae. The genus Loranthus, of which nearly the whole of its described species have been limited to the tropics, is, however, sparingly scattered on all the Coasts of Australia, where about eleven species have been recently observed, parasitical chiefly upon certain trees that constitute the mass of the forests of that vast continent; namely, Eucalyptus, Casuarina, Acacia, and Melaleuca.

A solitary and very remarkable deviation from the usual natural economy of Loranthus, is observed in a species (L. floribunda) described and figured by M. Labillardiere, which is found on the shores of King George's Sound, where, in no way recognising the dependent habits of its congeners, it rises from the soil to a tree fifteen feet high, being never remarked relying upon other vegetables for its subsistence. Viscum is found in the colony of Port Jackson, to which it is not confined, having been also gathered at Endeavour River, on the same coast, within the tropic. The southern range of the two genera seems to be nearly beyond the fortieth degree of latitude; but in the northern hemisphere, Loranthus exists in Siberia.

UMBELLIFERAE. The equinoctial portion of the Herbarium contains only three or four plants of this extensive European order, belonging to Hydrocotyle, Azorella of Cavanilles and Labillardiere (from which Trachymene of Rudge is probably not distinct) and a suffruticose plant referred to Cussonia, that have been collected upon the East Coast. Upon the north-western shores, Azorella was alone remarked, of which a species is very general upon its main and islands, and chiefly remarkable for its gigantic herbaceous growth.

MYRTACEAE. With respect to that portion of Myrtaceae, lately discovered upon the north-western shores of Australia, and which are alone worthy of remark here, it is to be observed, that, considering the many points of that coast visited during the progress of the relative voyages, the number of species observed are comparatively few, for, including Eucalyptus, it does not exceed sixteen plants. Of Eucalyptus itself, only seven species were detected on those shores, and these, for the most part, form small trees, more approaching the average dimensions of all their congeners in the colony of Port Jackson. Melaleuca is limited to three species, one of which was originally discovered by the celebrated navigator, Dampier, on the West Coast, where Beaufortia has been recently seen. Four species of Tristania, their related genus, were gathered in about latitude 15 degrees South, where also an Eugenia, bearing fruit, was observed; but of Leptospermum, or Baeckea, genera chiefly belonging to the higher latitudes of New Holland, no species appeared throughout the whole extent of coast examined.

RHAMNEAE and CELASTRINAE were formerly united among the Rhamni of Jussieu, but disposed in sections, differing from each other in the position of the stamina, with relation to the petals, and in the character of the fruit; which, when viewed with other important differences of fructification, induced Mr. Brown to modify and define them as distinct orders.