Robert Wayne Davis

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Wadithamnus artemisioides is a species of flowering plant belonging to the family Amaranthaceae. It is a subshrub or shrub native to Yemen and Oman in the southern Arabian Peninsula. It is the sole species in genus Wadithamnus. Two subspecies are accepted: Wadithamnus artemisioides subsp. artemisioides – southern Yemen Wadithamnus artemisioides subsp. batharitica (A.G.Mill. & J.A.Nyberg) T.Hammer & R.W.Davis – southern Oman

Westringia ophioglossa is a species of plant in the mint family that is endemic to Western Australia.

Westringia fitzgeraldensis is a species of plant in the mint family that is endemic to Western Australia.

Ptilotus luteolus is a species of flowering plant in the family Amaranthaceae and is endemic to inland Western Australia. It is a shrub or perennial herb with a single hairy stem, and oval or cylindrical spikes of yellow flowers.

Ptilotus eremita is a species of flowering plant in the family Amaranthaceae and is endemic to the south-west of Western Australia. It is a sometimes prostrate, annual herb with hairy leaves on the stems and at the base of the plant and green or yellow, oval or cylindrical spikes of flowers.

Ptilotus benlii is a species of flowering plant in the family Amaranthaceae and is endemic to northern Western Australia. It is an erect, perennial herb with a ribbed stem, narrowly lance-shaped stem leaves with the narrower end towards the base, green or white, oval or cylindrical spikes of flowers with long, silky hairs, and five fertile stamens.

Ptilotus halophilus is a species of flowering plant in the family Amaranthaceae and is endemic to Western Australia. It is a prostrate or low-lying perennial herb, with spoon-shaped, egg-shaped or elliptic leaves, spherical to oval spikes with a silvery sheen.

Ptilotus giganteus is a species of flowering plant in the family Amaranthaceae and is endemic to the north-west of Australia. It is an erect annual herb, with lance-shaped leaves with the narrower end towards the base, and cylindrical green spikes of flowers.

Ptilotus falcatus is a species of flowering plant in the family Amaranthaceae and is endemic to Western Australia. It is a prostrate to ascending perennial herb with annual stems from a woody rootstock, lance-shaped stem leaves with the narrower end towards the base, and single green or white, oval spikes of flowers.

Ptilotus exiliflorus is a species of flowering plant in the family Amaranthaceae and is endemic to the west of Western Australia. It is an annual plant with several more or less prostrate stems becoming glabrous as they age, hairy leaves, and green or white, oval or cylindrical spikes of flowers.

Ptilotus chrysocomus is a species of flowering plant in the family Amaranthaceae and is endemic to inland Western Australia. It is a compact, perennial shrub with erect, glabrous stems, narrowly lance-shaped stem leaves with the narrower end towards the base, yellow to straw-coloured, oval to spherical spikes of flowers with five stamens.

Ptilotus andersonii is a species of flowering plant in the family Amaranthaceae and is endemic to a restricted area of Western Australia. It is a prostrate, hairy, perennial herb with a spatula-shaped to lance-shaped leaves at the base of the plant, lance-shaped cauline leaves, and pink, oval spikes of flowers with two fertile stamens.

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Eremophila calcicola is a flowering plant in the figwort family, Scrophulariaceae and is endemic to a small area in the south of Western Australia. It is a low, spreading, short-lived shrub with broad leaves, and pale, greenish-yellow flowers over a long period.

Swainsona thompsoniana is a species of flowering plant in the family Fabaceae and is endemic to inland northern Western Australia. It is a prostrate annual herb, with imparipinnate leaves with 3 to 6 pairs of narrowly egg-shaped to egg-shaped leaflets with the narrower end towards the base, and racemes of up to 3 mauve and cream-coloured to yellow flowers.

Swainsona katjarra, commonly known as Birriliburu swainsona, is a species of flowering plant in the family Fabaceae and is endemic to inland Western Australia. It is an erect annual herb with imparipinnate leaves with 4 to 6 lance-shaped to egg-shaped to elliptical leaflets, and racemes of 15 to 25 magenta flowers.

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Ptilotus clivicola is a species of flowering plant in the family Amaranthaceae and is endemic to the south-west of Western Australia. It is a prostrate perennial to upright herb with flat, lance-shaped leaves with the narrower end towards the base on the stems, magenta, oval or cylindrical spikes of flowers with five stamens.

Ptilotus actinocladus is a species of flowering plant in the family Amaranthaceae and is endemic to inland Western Australia. It is a prostrate annual herb with a central stem and radiating lateral stems, linear to lance-shaped stem leaves, pink spherical or cylindrical spikes of flowers with long, silky hairs, and four fertile stamens.

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Grevillea hystrix, also known as porcupine grevillea, is a species of plant in the Proteaceae family and is endemic to Western Australia.