His contributions to the description of the Australian flora were prolific; he described hundreds of species of Australian Proteaceae, and many Australian species from other families, especially Fabaceae, Mimosaceae and Myrtaceae.
Kontribusinya terhadap deskripsi flora Australia adalah produktif; ia menggambarkan ratusan spesies Proteaceae Australia, dan banyak spesies Australia dari familia lain, terutama Fabaceae, Mimosaceae dan Myrtaceae.