Casuarina obesa Miq.

Swamp Sheoak

in Lehm., Pl. Preiss. 1: 640 (1845) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Threat status:Victoria: endangered (e); listed in Flora and Fauna Guarantee Act 1988

Freely root-suckering and able to form extensive copses. Trees to c. 15 m high. Branchlets drooping or spreading, to 21 cm long; internodes 8–20 mm long, c. 1 mm diam., smooth, usually waxy; ribs flat or slightly rounded. Teeth 12–16, erect on new shoots, then occasionally spreading slightly, but soon breaking off. Male spikes 1.5–6 cm long, 7–10 whorls per cm. Cones sessile or on peduncle to 10 mm long, cylindric; cone body 10–22 mm long, 8–12 mm diam. Winged seeds 3–5 mm long. Flowers seldom seen.

Glep, MuM, RobP, VRiv, Wim. WA, NSW (where now possibly extinct). Known only from the edge of the Karadoc Swamp near Red Cliffs, and from scattered localities in the Kiata-Warracknabeal-Mt Arapiles area. Grows in occasionally flooded, sometimes brackish or saline areas.

The cones of C. obesa tend to be less broad than those of C. pauper, and the valves are generally less pointed and thinner, but such distinctions are not always clear in Victorian material. Plants with viral or fungal infections may be grossly distorted: e.g. material has been observed with branchlets to 2 mm diam., teeth numbering more than 20, and fruits to 30 mm long and 19 mm diam.

Populations of C. obesa from Karadoc Swamp seldom produce cones, and the trees are apparently suffering from the increased salinity of water entering the swamp.

Source: Entwisle, T.J. (1996). Casuarinaceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 3, Dicotyledons Winteraceae to Myrtaceae. Inkata Press, Melbourne.
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Rosanae
order Fagales
family Casuarinaceae
genus Casuarina
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Casuarina obesa in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Casuarina obesa in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Murray Mallee present native
Wimmera present native
Glenelg Plain present native
Victorian Riverina present native
Robinvale Plains present native
Central Victorian Uplands present cultivated

State distribution

Distribution map
Western Australia
South Australia
New South Wales