Broadway Arboretum

Species Information Page

Allocasuarina fraseriana Sheoak

   
 

 

Map loads from Florabase

Location in Arboretum: Northern Jarrah Forest
No on Map: NJF01

  • Timber used for shingles and (staves for wine casks (Bennett 1988)) by early European settlers (Powell 1990).  Sheoak splits well (Seddon 1972, p. 142).
  • Has a beautiful coloured wood.
  • Associated insects well camouflaged; A sap sucking bug lives in the twigs, invisible except for a protruding tube that exudes a honey dew, which falls to the ground and is eaten by ants; A weevil species that eats the foliage is shaped and coloured to match the needles. (Powell 1990).
  • Sheoaks have branchlets that function as leaves (Seddon 1972, p. 142).
  • Female plants release winged seeds, especially after fire (Seddon 1972, p. 142)

Wind pollination

  • Approximatly one third of plants are wind pollinated (Tinker 2007).
  • Casuarinas and Allocasuarinas are wind pollinated and can be pollinated from plants thousands of kilometres away. Sounds ludicrous but it works.  Wind pollinated viewed as primitive.  Plants need to produce billions of pollen grains.  
  • Wind pollinated plants need to be able to sort pollen grain. When the right pollen land there is a chemical reaction (like with Mistletoe seed) (Tinker 2007).
  • Genetic studies shown few wind pollinated plants have same male parent, and this affects the level of genetic diversity (Tinker 2007).
  • Male plants of some wind pollinated species are more slender than more solid female plants of the same species so the branches are more easily moved by wind to disperse pollen (Tinker 2007).

References
Bennett, E. M. (1988). The bushland plants of Kings Park.
Powell, R. (1990). Leaf and branch - Trees and tall shrubs of Perth, Department of Conservation and Land Management.
Seddon, G. (1972). Sense of Place, University of Western Australia Press.
Tinker, A. (2007) (From a tour conducted by Western Flora Caravan and Tourist Park)