Volume II Part 49 (1/2)
Captain King brought home several minute species of Nautilus, which will be taken notice of at a future period, as they require particular examination and minute comparison with those found upon the coasts of Italy and other parts of Europe.
Note. Specimens of the sh.e.l.ls in the above catalogue, to which the following numbers refer, have been presented to the British Museum, namely, 2, 5, 7, 8, 12, 13, 17, 20, 25, 28, 29, 31, 46, 48, 90, 91, 92, 94, 95, 96, 97, 98, 99, 102 and 103.
A FEW GENERAL REMARKS ON THE VEGETATION OF CERTAIN COASTS OF TERRA AUSTRALIS, AND MORE ESPECIALLY OF ITS NORTH-WESTERN Sh.o.r.eS.
BY MR. ALLAN CUNNINGHAM, COLLECTOR TO THE ROYAL GARDENS AT KEW.
It having been resolved by the British Government to employ a colonial vessel from the settlement of Port Jackson in New South Wales, for the purpose of exploring the whole of the North-western Coasts of New Holland, and that portion of the North Coast, not seen by that able navigator, the late Captain Flinders; a most favourable opportunity was thereby afforded for a partial examination of the plants of those unknown sh.o.r.es, with a view of adding to our progressively augmenting knowledge of the very interesting Flora of this southern continent.
Having materially profited by a twelvemonth's previous residence in New South Wales, acquainting myself with the characters (and princ.i.p.al peculiarities of structure) of many genera of plants absolutely proper to Terra Australis; and particularly in that period, throughout the progress of a long and very interesting journey in the interior, to the westward of Port Jackson, I was most happy and desirous to obey an instruction I received from the Right Honourable Sir Joseph Banks, on behalf of the Government, directing me to place myself under the orders of Captain P.P.
King, to whom the execution of this important service had been intrusted, and to accompany him to those particular coasts, destined for his investigation, in order to form and prepare such collections of their vegetation, for the use of His Majesty's gardens at Kew, as circ.u.mstances, and the particular season of the year proper for visiting those sh.o.r.es, might afford me. My very limited knowledge of the plants of that continent, especially of genera, that form a striking feature in its Flora, was moreover essentially improved during our stay at King George's Sound on the South-west Coast, previous to our arrival upon the North-west Coast, at the commencement of the first voyage of His Majesty's cutter the Mermaid.
Although the reader may inform himself, from Captain King's relation of the several voyages, of the opportunities that were afforded me in forming my collections of plants, still it appears necessary, in this place, to take a general retrospective view of those parts of the coasts under examination, whereon my researches were made, adverting, at the same time, to the prevalent unfavourable seasons for flowering plants, during which it should seem the survey of the North-west Coast could alone be effected with safety.
During the progress of the survey of the southern extreme of the North-west Coast (at which part Captain King commenced his examinations, in 1818) I landed in Exmouth Gulf, then upon one of the islands of Dampier's Archipelago, at the Intercourse Islands, and on Malus Island; but the results of these several excursions (in some of which ample time was afforded me) did by no means answer my expectations; herbaceous plants being for the most part dead, and the few (hard woody) shrubs scarcely bearing fructification: disadvantages arising, in fact, from the extreme barrenness of the land, and more particularly from the prevalent droughts of the season, previous to the change of the monsoon, which soon afterwards took place, obliging us to quit the North-west Coast altogether; the remaining periods of the voyage being employed in the examination of certain parts of the North Coast.
We again reached the North-west Coast, in the month of September of the following year, resuming the survey at its northern extremity, under the most flattering views, and with a favourable season for the prosecution of that primary object of the voyage. Between the meridians of 125 and 129 degrees, on the parallel of 14 degrees, although a large proportion of the vegetation was for the most part destroyed by the long established droughts, the number of specimens of plants bearing fructification, gathered at Port Keats, Vansittart Bay, Port Warrender, and especially in Cambridge Gulf (where we spent ten days) was nevertheless considerable and highly interesting, belonging, however, almost wholly to established genera of which Grevillea and Acacia were the most striking. The breaking up of the monsoon at length again obliged Captain King to close his examination of the coast for that season, to which we, however, returned in September, 1820, continuing the survey westerly from the point at which we had left those sh.o.r.es the preceding year. I had very eligible opportunities of landing upon the sh.o.r.es of Montagu Sound, Capstan Island, Cape Pond, York Sound, especially at the head of Hunter's River, at Brunswick Bay, and in Careening Bay, Port Nelson; at which several parts the collections formed were very important, but not extensive.
Our encampment on the sh.o.r.e of the latter bay, during the repair of the vessel, enabled me to examine the country around, to the distance of four or five miles; but it being at the height of the dry season, comparatively few flowering plants were detected, and no herbaceous plants of importance. Our prolonged stay there also enabled me to form some idea of the Flora of its sh.o.r.es and neighbouring country, from which I gathered materials for comparison with the vegetation of Endeavour River, situated at the eastern extreme of its parallel on the opposite sh.o.r.e of the continent: the ident.i.ty of certain species on either coast, together with the inference drawn therefrom, will appear stated, towards the close of this general notice. Very few new genera were the fruits of this third voyage, but many undescribed plants of old genera were discovered, and with those that are frequent on the North Coast, and tropical sh.o.r.es of New South Wales, some were remarked that were originally discovered on the South Coast. The period again arrived, that rendered it necessary to depart from the coast, independent of the leaky state of our vessel, which materially hastened our return to Port Jackson, when the cutter was considered wholly unfit for a fourth voyage, in which the complete survey of the north-west, and the examination of the line of west coasts were contemplated. To effect this important service, the colonial government purchased a brig, subsequently named the Bathurst, and I again accompanied Captain King from Port Jackson, in May, 1821, to those parts of the coasts then remaining unexplored, at which we arrived at the close of July. Our very limited stay on those sh.o.r.es, however, was at that season wherein all vegetation was suffering under the excess of drought; I had nevertheless the means afforded me of ascertaining the general ident.i.ty of the plants of Prince Regent's River, Hanover Bay, and Port George the Fourth (portions of the coast explored in the voyage) and other parts in the vicinity, that were examined the preceding year, at a like season, but under circ.u.mstances much more favourable. Upon our return to the North-west Coast from the Mauritius, early in 1822, the only part visited was Cygnet Bay, situate about 2 1/2 degrees to the south-west of the last-mentioned sound, and it happening at a season when some rain had fallen, I met with several plants in an abundant flowering state, of species, however, in part originally discovered upon other coasts, and described by Mr. Brown, during the Investigator's voyage.
Of the West Coast (properly so denominated) which was seen during the Bathurst's voyage, very little can be said in reference to its vegetable productions, and most probably nothing can be here advanced, tending to augment our very scanty knowledge of its Flora, acquired in part long since, through the medium of the celebrated navigator, Dampier, but more especially by the botanists accompanying Captain Baudin's voyage. I had no opportunity of examining any part of the main, during our run northerly along its extensive sh.o.r.e, but I landed on Rottnest Island, and repeatedly visited the northern extremity of Dirk Hartog's Island, off Shark's Bay, where I gathered, under every discouragement of season, some of the most important portions of its rich vegetation; in many instances, however, in very imperfect conditions of fructification. Its general features led me decidedly to a.s.similate it to the striking character of the botany of the South Coast; a characteristic of which it is more than probable the mainland largely partakes, if we may draw an inference from its aspect at widely distant parts.
Upon those portions of the North Coast, which were chiefly surveyed during the Mermaid's first voyage, at a period immediately subsequent to the season of the rains, I had very favourable opportunities of increasing my collections upon the Goulburn Islands, Ports Essington and Raffles, Croker's Island, Mount-Norris Bay, and on the sh.o.r.es of Van Diemen's Gulf; and among many described species, discovered formerly in the great Gulf of Carpentaria, there were several most interesting new plants. With a view towards an entire completion of the survey of the several coasts of the continent, that part of New South Wales within the tropic, north of Cape Bedford, which was not seen by Captain Cook, entered into the plans of the Mermaid's second voyage; and it was highly gratifying to my feelings to reflect that it was reserved for me to complete several specimens discovered formerly in imperfect states by those eminent naturalists who accompanied the above great circ.u.mnavigator, in 1770, desiderata, that have been wanting ever since this period of their discovery; no mediums of communication with those particular parts of the coast having presented themselves.
The aggregate of the several collections that have been formed during the progress of the four voyages under the general circ.u.mstances above briefly referred to, and which, as const.i.tuting a small Herbarium, will be thus collectively spoken of in the following remarks, does not exceed one thousand three hundred species of Phaenogamous plants; of these five hundred and twenty are already described by authors, the other portion being in part unpublished species, previously discovered on other coasts of Terra Australis, and in part absolutely new, referable, however, mostly to well defined genera. Of Cryptogamous plants, there are but few species, and of these, or parasitical Orchideae, none have been detected in these voyages in addition to those already described: a circ.u.mstance, that with respect to the North-west Coast can reasonably be accounted for, from the non-existence of primary mountains, or land above very moderate elevation; by the absence of lofty dense forests (points of character necessary to that permanency of atmospheric moisture, which const.i.tutes an essential requisite to the existence of almost the whole of these tribes): and the consequent general exposure to the sun of those arid sh.o.r.es.
Limited in number as the new species really are, they will nevertheless const.i.tute, when added to the discoveries recently made, through the medium of expeditions to the interior, from the colony of Port Jackson, very important materials to carry on that Flora of Australia, so very ably commenced by Mr. Brown. Since that eminent botanist has already advanced much important matter in the valuable essay, published at the close of the account of Captain Flinders' voyage, respecting the relative proportions of the three grand divisions of plants in Australia, as far as they had been discovered at that period, and has, from very extensive materials, given us a comparative view of that portion of its Flora, and the vegetation of other countries; I shall now simply submit a few general remarks in this notice, on certain plants of established natural families, that have been discovered in the progress of these voyages; closing this paper with some observations, chiefly ill.u.s.trative of the geographical diffusion of several Australian plants known to authors, whose localities have hitherto been exceedingly limited.
PALMAE. On considering the vast expanse of the continent of Terra Australis, and that great extent of coast which pa.s.ses through climates favourable for the production of certain genera of this remarkable natural family, it is singular that so few of the order should have been discovered: a fact in the history of the Australian vegetation, which (upon contemplating the natural economy of many other genera of plants) can only be considered as accounted for, by the great tendency to drought of at least three-fifths of its sh.o.r.es.
To Corypha, Seaforthia, and Livistona, the only three genera that have been enumerated in the productions of the Australian Flora, may now be added Calamus; of which a species (discovered without fructification, by Sir Joseph Banks, during the celebrated voyage of Captain Cook) has at length been detected bearing fruit in the vicinity of Endeavour River.
The existence of this palm, or rattan, on the East Coast, to which it is confined, seems almost to be limited to an area within the parallels of 15 and 17 degrees South; should, however, its range be more extensive, it is southerly one or two degrees, in which direction a remarkable primary granitic formation of the coast continues, throughout the whole neighbourhood of which is a peculiar density of dark moist forest, seemingly dependent on it, and evidently indispensable to the life of this species of Calamus; but at the termination of this geological structure, it most probably ceases to exist. A dioecious palm of low stature, and in habit similar to Seaforthia, was detected in the shaded forests investing the River Hastings, in lat.i.tude 31 degrees South, bearing male flowers; but as it may prove to be a dwarf state of a species of that genus, which has lately been observed, with all its tropical habits, in a higher lat.i.tude, it cannot now be recognised as a sixth individual of the family whose fructification has been seen.
Although this order has been observed to be sparingly scattered along the line of East Coast almost to the thirty-fifth degree of south lat.i.tude, its range on the opposite sh.o.r.es of the continent is very limited. Upon the North-west Coast, the genus Livistona alone has been remarked, in about lat.i.tude 15 degrees South; beyond which, throughout a very extensive line of depressed sh.o.r.e, towards the North-west Cape, no palms were seen. If the structure of a coast, and its natural disposition to produce either humidity or drought be consulted (a point, with respect to this order, as well as certain other tropical tribes, appearing very important) those portions of the western sh.o.r.es recently seen, indicate no one character that would justify the supposition of the existence of the Palmae in the corresponding extremes of the respective parallels that produce them on the opposite or East Coast. Another remark relative to the economy of this family is, that in New Holland it seems confined to the coasts, Corypha australis, so frequent in particular shaded situations in the neighbourhood of Port Jackson, having never been detected in the vicinity of, or upon the mountains, much less in the distant country to the westward of that extensive boundary.
ASPHODELEAE. Among the several described plants in the Herbarium, referred to this family, that were collected upon the East and South-west Coasts, are specimens in complete fructification of a remarkable plant of arborescent growth, having a caudex twenty feet high, and all the habits of Dracaena. It probably const.i.tutes a new genus distinct from Cordyline of Commerson, to which, however, it appears closely allied; and has an extensive range on the East Coast, where, although it has for the most part been observed within the tropic, it extends nevertheless as far as lat.i.tude 31 degrees South. The only plants of Asphodeleae remarked on the north-western sh.o.r.es, were an imperfect Tricoryne, probably Tenella of Mr. Brown, discovered by that gentleman during the Investigator's voyage on the South Coast; and the intratropical Asparagus, which is frequent in lat.i.tude fifteen degrees South.
CONIFERAE. To the general observations already made on that part of Coniferae inhabiting the southern hemisphere, may be added some important facts, to be gathered from the plants in the Herbarium of the late voyages, that will afford a very correct view of the fructification of some doubtful genera, as well as their limits. Among these the fruit of Podocarpus aspleniifolia of M. Labillardiere, was observed, together with the female fructification of another tree (the Huon pine) found also at the southern extremes and western coast of Van Diemen's Land, which may prove to be a Dacrydium. Callitris, of which seven species are known, and princ.i.p.ally found in the parallel of Port Jackson, has also been discovered upon the North-west Coast, in about lat.i.tude 15 degrees South; and another species, remarkable for its general robust habit, was observed at Rottnest Island, on the West Coast. A tree, most certainly of this family, and probably (from habit) a Podocarpus, has been seen upon the East Coast, within the tropic, but the absence of fructification prevented its genus being satisfactorily determined. With respect to the extent of the order in the Islands of New Zealand, some recent specimens gathered upon the northern, prove one of its pines to be a Podocarpus; and another, producing a cone, and solitary, alternate scattered elliptical leaves, shows its relation to Agathis of Salisbury, or Dammar pine of Amboina.
URTICEAE, whose ma.s.s appears also to be confined to equinoctial countries, may be considered very limited in those parts of Terra Australis lying within the tropic recently explored. Ficus is the most considerable genus of the order in that continent; and although chiefly found on the north and north-western sh.o.r.es, is also traced on the East Coast, almost to lat.i.tude 36 degrees South, where the trees attain an enormous size. About sixteen species are preserved in the collections of the late voyages; all small trees, and one half of which has been gathered on the North-west Coast.
A species of Morus, bearing small white fruit, was discovered upon the continent and islands of New South Wales within the tropic, where also a new genus of the order, with radiated leaves, has been traced as far as Endeavour River. Of the genus Urtica, whose numerous species can simply be considered as of herbaceous duration, although a few of tropical existence a.s.sume a fruticose habit, there is one plant in the vicinity of the Colony of Port Jackson, remarkable for its gigantic, arborescent growth; many specimens having been remarked from fifteen to twenty feet in height, of proportional robust habit, and of highly stimulating nature.
SANTALACEAE. Nearly three-fourths of the Australian portion of the order described, were formerly discovered in the parallel of Port Jackson, upon the sh.o.r.es of the South Coast, and in Van Diemen's Land. The genus Ch.o.r.etrum, however, heretofore limited to the southern extremes of the continent, approaches within about two degrees of the tropic on the West Coast, having been lately observed on Dirk Hartog's Island. It is rather remarkable that neither Leptomeria nor Ch.o.r.etrum form a part of the feature of the vegetation of the arid, depressed portions of the North-west Coast,* where several of the more harsh, rigid kinds of plants, of various genera, of the South Coast have been remarked. Those extensive sh.o.r.es (generally speaking) are not wanting in the order, for two species of the tropical genus Santalum, Exocarpus, and a globular-fruited Fusa.n.u.s, were collected in and about the parallel of 15 degrees South.
(*Footnote. Towards the North-west Cape.)
PROTEACEAE. Since the publication of Mr. Brown's valuable dissertation on this very extensive natural family, in which were described all the species known at that period, a few important discoveries have been made in Terra Australis, particularly on the North-west Coast, where the order seems to be limited to Grevillea, Hakea, and Persoonia.