1	"Upper surface of leaf blades glabrous or rarely with a few scattered hairs"	"Euphorbia australis var. glabra"
1	"Upper surface of leaf blades sparsely to densely hairy"	2
2	"Leaf margins entire; plants moderately to densely villous; seeds ≤ 1.3 mm long"	"Euphorbia australis var. subtomentosa"
2	"Leaf margins toothed, sometimes only distally; plants hispid to hispidulous, pilose or sparsely to densely villous; seeds 1-1.6 mm long"	3
3	"Plants hispid to hispidulous; hairs on capsules mostly ≤ 0.3 mm long; dorsal faces of seed faintly irregularly ridged or undulate"	"Euphorbia australis var. hispidula"
3	"Plants pilose to villous; hairs on capsules > 0.3 mm long; dorsal faces of seed distinctly irregularly ridged"	4
4	"Plants pilose to villous; leaf blades 9-16 mm long by 3-9 mm wide; cyathia mostly green; glands yellow to red; gland appendages often white to creamy yellow, shallowly lobed or toothed; grows in coastal and subcoastal areas"	"Euphorbia australis var. australis"
4	"Plants villous; leaf blades 3.2-8 mm long by 2-5 mm wide; cyathia and glands red; gland appendages red, usually acutely toothed; grows in inland arid areas"	"Euphorbia australis var. erythrantha"