The flowers are borne singly in leaf axils on a thin pedicel 4–11 mm (0.16–0.43 in) long and with a top-shaped tip.

[3] In 1843, James Drummond published a description of a plant he called Boronia molloyi in the London Journal of Botany.

The same species was given the name Boronia elatior by Friedrich Gottlieb Bartling in 1844 and B. semifertilis by Ferdinand von Mueller in 1861.

[4][5][6] Tall boronia grows in sandy soils along watercourses and near swamps between Gingin and Albany in the Jarrah Forest, Swan Coastal Plain and Warren biogeographic regions.

[2][3] Boronia molloyae is classified as "not threatened" by the Government of Western Australia Department of Parks and Wildlife.