Brook peppermint grows in the Darling Range along brooks, often in thickets. It is a slender shrub, growing up to 5 m tall. Small white flowers occur throughout the year, but especially in spring and early summer. The species name comes from Latin – linearis “linear” and folium “leaf”
Ref:
“Leaf and branch: trees and tall shrubs of Perth” by Robert Powell. Published by the Western Australian Department of Environment and Conservation, 2009.
Florabase website: florabase.dpaw.wa.gov.au, Nov 2022.