The Small-leaved Mottlecah (Eucalyptus macrocarpa subsp. elachantha) is a priority species. The specimen at Broadway Arboretum is not Declared or Priority Flora.
Grows in a variety of soils.
Six novel phloroglucinol dialdehyde diterpene derivatives (macrocarpals B-G), which have antibacterial activity, were isolated from leaves of Eucalyptus macrocarpa (1); and A novel antibacterial compound, macrocarpal A, was isolated from the leaves of Eucalyptus macrocarpa (2)