On the eastern side the plains and rocky ridges, where not artificially cleared, are occupied by shaggy and often sombre forests mainly composed of the following genera: Eucalyptus (gum tree), Casuarina, Bursaria, Acacia, Leptospermum, Drimys, Melaleuca, Dodonaea, Notolea, Exocarpus, Hakea, Epacris, Xanthorrhoea, Frenela.
The Proteaceae, according to Heer, are still common, the Australian genera Hakea, Dryandra, Grevillea and Banksia, being represented.
The chief genera are banksia (honeysuckle), and hakea (needle bush).
Heer has described such Australian genera as Banksia, Eucalyptus, Grevillea and Hakea from the Miocene of Switzerland.
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