Flowering occurs from July to September and the fruits which follow are dry, oval-shaped, wrinkled, glabrous and 3–4 mm (0.1–0.2 in) long.

[3][2] The species was first formally described in 1882 by Ferdinand von Mueller and George Bentham from specimens collected by Augustus Frederick Oldfield at Port Gregory.

[2] Eremophila microtheca occurs in moist places between Kalbarri and Eneabba[3] in the Geraldton Sandplains biogeographic region.

[9] Eremophila microtheca is classified as "Priority Four" by the Government of Western Australia Department of Parks and Wildlife,[9] meaning that is rare or near threatened.

Mature plants tolerate long drought or temporary flooding but they do not grow well in areas of high humidity.