Family: Fabaceae
Acacia stenophylla, commonly known as shoestring acacia, river cooba, or river myall, is a fast-growing, drought-tolerant tree native to inland Australia. It typically reaches heights of 6–20 meters and is recognizable by its long, narrow “shoestring” leaves and feathery yellow flower clusters that appear in late winter to spring. This species is well adapted to riverine environments and floodplains, tolerating periods of both waterlogging and drought. It is valued for its rapid growth, shade provision, and ability to stabilize soil, making it a popular choice for erosion control and ornamental planting in dry landscapes.
Despite its utility, Acacia stenophylla has traits that can pose ecological risks outside its native range. It produces abundant seeds that are easily dispersed by water, and it can establish quickly in disturbed habitats, potentially outcompeting native vegetation. Its resilience to harsh conditions and rapid growth increase its potential to naturalize in non-native regions, particularly in areas with similar climates to inland Australia. Management considerations are recommended for regions like Hawaii and the Pacific Islands, where it could alter native plant communities, impact water availability, or contribute to unintended ecosystem changes.
High Risk Traits:
- Broad climate suitability
- Grows in tropical climates
- Weakly naturalized in disturbed sites in urban areas of Arizona
- Considered a woody weed in parts of the Channel country in north?western Queensland (impacts unspecified)
- Other Acacia species are invasive
- Tolerates many soil types
- Forms dense, monospecific stands along rivers in native range
- N-fixing (may alter soil chemistry)
- Reproduces by seeds and vegetatively by suckering
- Seeds dispersed by water and intentionally by people
- Able to coppice and resprout after cutting
Low Risk Traits:
- Unarmed (no spines, thorns, or burrs)
- Provides fodder for livestock
- Non-toxic
- Ornamental
- Requires full sun
- Herbicides may provide effective control
