This native shrub is commonly known as narrow-leaved acacia.
Acacia longissima is described as a "higher dicot" in the Leguminosae (Caesalpinioideae, mimosoid clade) family.
In the Queensland Nature Conservation Act it is classified as Least Concern. Under the Federal Environment Protection Biodiversity Conservation Act it is not classified.
Main distribution from Gympie region southwards.
It has been recorded in the Wide Bay district in the Queensland Herbarium Census but is not listed as occurring in the Fraser Coast region in Queensland Herbarium Wildlife Online.
Reported at 0 Fraser Coast localities: .
Fraser Coast distribution based on unverified field reports.