Eucalyptus myriadena is a mallee or tree that typically grows to a height of 3 to 12 metres (10 to 39 ft) and forms a lignotuber.

[3] In 1993, Ian Brooker described two subspecies and the names have been accepted by the Australian Plant Census:[7] Eucalyptus myriadena is part of the subgenus Symphyomyrtus section Dumaria in a sub-group of nine closely related species called series Ovulares.

[10] This eucalypt is found on plains and low rises and around clay flats and salt lakes and swamps in the Mid West, Wheatbelt and Goldfields-Esperance region of Western Australia where it grows in gravelly sandy-clay-loam soils.

[4] It has a scattered distribution from Coorow in the north west to Ravensthorpe in the south extending to Coolgardie in the east.

Associated species in the variable understorey includes Rhagodia drummondii, Enchylaena lanata, E. tomentosa, Sclerolaena diacantha, Atriplex paludosa, A. vesicaria, Austrostipa elegantissima, Actinobole uliginosum, Eremophila decipiens, Scaevola spinescens, Lycium australe, Melaleuca acuminata, M. lateriflora, M. lanceolata, M. pauperiflora and Maireana erioclada.