Family: Fabaceae
Origin, Description & Uses
Parkia speciosa (petai), also known as stink bean or bitter bean, is a large tropical tree native to Thailand and western to central Malesia, including parts of Malaysia, Indonesia, and surrounding regions. It produces long clusters of flattened green seeds with a strong sulfur-like odor that are widely eaten in Southeast Asian cuisine. The tree has a broad spreading canopy, feathery foliage, and distinctive hanging flower heads that attract pollinators such as bats and insects. Petai is cultivated as a food crop, shade tree, and ornamental in tropical regions, and its seeds are valued for their unique flavor and traditional medicinal uses.
Risks & Threats
Although Parkia speciosa is not currently known to be naturalized in Hawaii, it possesses traits that are cause for concern. As a fast-growing tropical tree capable of producing abundant seeds, it may have the potential to spread in suitable climates and compete with other vegetation if not properly managed. Large trees can also alter light availability and ecosystem structure in sensitive environments. Ongoing evaluation is needed to determine whether this species could negatively impact Hawaii’s ecosystems. Caution is recommended when planting, particularly near natural areas, and responsible management can help reduce the risk of unintended spread.
High Risk Traits:
- Possibly naturalizing in Hilo, Hawaii
- Thrives in tropical climates
- Can grow from 0-1400 m elevation within native range
- Shade-tolerant
- Tolerates many soil conditions (and potentially able to exploit many different habitat types)
- N-fixing (may alter soil chemistry)
- Can produce high numbers of seeds which may be dispersed by birds
Low Risk Traits:
- No negative impacts have been documented to date
- Unarmed (no spines, thorns or burrs)
- Fodder tree
- Non-toxic
- Landscaping and ornamental value
- Edible seeds
- Self-incompatible breeding system
- Reaches reproductive maturity in 5+ years
- Recalcitrant seeds lose viability rapidly
