Territory Stories

Mary River Floodplain Vegetation



Mary River Floodplain Vegetation


Lynch, D; Northern Territory. Department of Lands, Planning and Environment. Resource Capability Assessment Branch


E-Publications; E-Books; PublicationNT; Technical Report No. 08/2015




Mary River


The Mary River Flood Plains are approximately 100km east of Darwin and have a catchment area of about 7700 kn12 (Woodroffe 1993). The headwaters are approximately 18Skm inland. The southeast corner of the catchment includes Coronet Hill and a sandstone/siltstone plateau. Further to the south west in the Pine Creek region are undulating to rolling hills (includes strike ridges) of greywacke, sandstone and siltstone. The west side of the catchment includes undulating to rolling granite rises with some rugged hills. The McKinlay River joins the Mary River just south of the Arnhem Highway. From here the river divides into a series of streams and billabongs which are only connected in the Wet season.


Please replace the current item on the system with this report. This is the original report, produced in 1996 by the then Department of Lands, Planning and Environment. The report was resubmitted in order that it could be correctly filed with a Technical report number.

Table of contents

Introduction -- Climate -- Vegetation -- Method -- References




Floodplains -- Northern Territory -- Mary River; Vegetation surveys -- Northern Territory -- Mary River Region; Floodplain plants -- Northern Territory -- Mary River Region; Mary River Floodplain Vegetation

Publisher name

Northern Territory Government

Place of publication



Technical Report No. 08/2015


1 volume (no pagings) : illustrations (some col.), maps ; 30 cm.

File type



Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government



Parent handle


Citation address


Page content

Backswamp areas which receive runoff from nearby creeks and dry out for only a month or two. Occurs throughout the floodplain . 9. Sedge land of Eleocharis dlllcis, tnixed with Eleoc!wris sphacelala and other Eleoclraris ~1Jecies, Ipomea aqllatica, Lu(hvigia adscendens, [-{ymenachne aClltiglwl1a, Pistia stratoites, Pseudoraphis spinescens, Spirodela polyrhiza, Chara species and Ne/llmbo flllc~fera and Nymp/wea violaceae. Mi1110sa pigra located in some areas. Extensive areas with intermediate water depths and extends to the paleoestuarine plain. 10. Grassland of Olyza rllfipogofl with dominating patches of E/eocharis d({/cis. Other species which OCCllr throughout are Ipomea aqllatica, Ludwigia adscendens, Marsilea mutica, Phyllantlllls nodijlora, and Me/ocllia cotchor(folia. Mitllosa pigra may occur in this unit. nraclziaria l1llltica has invaded areas of this unit. 11. Low areas with a mixed Grassland/Sedgeland of 01YZ(l tlljlpogon and E/eoc!laris ~phacelata Other associated species are Chara and Eleoc!wtis species, Pseudoraphis spinescens and Nymphaea violaceae. Ali1110sa pigra may occur in this unit.. Billabongs and deep drainage channels which lTIay join up in the wet season. 12. Vegetation forms floating lllats covering the billabong. Species include Ludwigia adscensdeTls" Ipomea aquatica" Leersia hexaTldra, l-Iymellacl1l1e aClitigllllna. Also Azolla pinnala, Ceraloplzyllllll1 demcrsllIl1, Chara sp., E/eoclwris ~1)lrace/ata, Najas lellul/alia, Ne/llmbo llllc({era, Pislia stratoites, and Spirode/a polyr/riza are found . Figure 4: Unit 12.