Landerolaria macdonnellensis

Landerolaria macdonnellensis is a species of flowering plant in the family Asteraceae which is endemic to a restricted part of the Northern Territory of Australia. It is an erect, bushy shrub with broadly elliptic to broadly egg-shaped leaves and yellow, or white and yellow, daisy-like inflorescences.

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Landerolaria macdonnellensis is an erect, bushy shrub that typically grows to a height of up to 1.2 m (3 ft 11 in) and has angular stems and hairy young branchlets. Its leaves are arranged alternately along the branchlets, broadly elliptic to broadly egg-shaped, 17–27 mm (0.67–1.06 in) long and 8–15 mm (0.31–0.59 in) wide on a petiole 2–6 mm (0.079–0.236 in) long and with a few small teeth on the edges. The heads or daisy-like "flowers" are arranged in clusters of two to five on the ends of branchlets on a peduncle 7.5–24 mm (0.30–0.94 in) long, each head 30–35 mm (1.2–1.4 in) wide with six to eight white or yellow ray florets, the ligule 7–11 mm (0.28–0.43 in) long, surrounding fifteen to twenty yellow disc florets. Flowering occurs from May to October and the fruit is a hairy achene, the pappus with 20 to 32 bristles.

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The species was first formally described as Olearia macdonnellensis by David Alan Cooke in 1986 in the journal Muelleria from specimens collected by Peter Latz in 1983 near the "Ellery Creek Big Hole". In 2020 Guy L. Nesom placed the species in the newly-described genus Landerolaria as L. macdonnellensis after Olearia had been found to be polyphyletic.

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