Australian Native Plants

  Casuarina obesa (Swamp Oak)


Casuarina obesa photo
Casuarina obesa

Photograph by Murray Fagg. Some rights reserved.    (view image details)

Casuarina obesa photo
Casuarina obesa

Photograph by Kevin Thiele. Some rights reserved.    (view image details)



Credits:
Description and Habitat information is sourced from: State of Victoria (Agriculture Victoria), Victorian Resources Online,http://vro.agriculture.vic.gov.au/dpi/vro/vrosite.nsf/pages/water_sip_scientific_a Licensed under Creative Commons CC BY 4.0 license.


Growth Characteristics information is sourced from: State Flora Catalog, Government of South Australia Licensed under Creative Commons CC BY 4.0 license.



SWAMP OAK FACTS

distribution map showing range of Casuarina obesa in Australia

Map is from The Atlas of Living Australia web site, licensed under Creative Commons Attribution 3.0 Australia License


Common Name
Swamp Oak

Description
The Swamp Oak is a tree from 6-15 m tall which frequently produces root suckers. The bark is finely fissured, scaly, grey-brown. The leaves are reduced to minute 1 mm long teeth in whorls of 12-16 on long, jointed, slender, wiry, ribbed, grey-green, branchlets.

Plants are either male or female. Male flowers in elongated spikes, 1.5-6 cm long, with alternating tooth-like bracts. Female flowers in globular to ovoid heads on short lateral branchlets. Fruit of pale yellow-brown to dull grey, winged seed contained in cones, 10-22 mm long and 8-12 mm long with valves well extended from the cone body.

Habitat
Grows in brackish or saline swampy ground near lakes or rivers.

Distribution
native to south west parts of Western Australia, with a much more restricted occurrence in Victoria and New South Wales. In Victoria mainly known from scattered locations in the Wimmera. Also around Karadoc Swamp near Red Cliffs in the Mallee where it has suffered from excessive salinity.

Growth Characteristics
Height (m): 10 - 15
Spread (m): 5 - 10
Soil Texture: sand, loam, clay, limestone
Soil pH: acid soils, neutral soils, alkaliine soils
Frost Sensitivity: resistant
Minimum Rainfall (mm): 350
Flower Colour: insignificant
Flower Season: winter, spring

(source: SA State Flora Catalog)

Wildlife Interest
birds, insects



Classification
Class:Magnoliopsida
Order:Fagales
Family:Casuarinaceae
Genus:Casuarina
Species:obesa
Common Name:Swamp Oak


Relatives in same Genus
  Casuarina pauper