Family: Araliaceae
Origin, Description & Uses:
Heptapleurum calyptratum, commonly known as mallet flower, is native to Assam, southern Yunnan in China, and parts of Indochina. It is a scrambling tree or large woody climber that grows naturally in wet tropical forests, where it can weave through surrounding vegetation as it seeks light. The species belongs to the ginseng family (Araliaceae) and is valued for its attractive foliage, unusual growth form, and ornamental appeal in tropical gardens and landscapes. Its ability to thrive in warm, humid conditions makes it suitable for cultivation in tropical and subtropical regions.
Risks & Threats:
Although Heptapleurum calyptratum is not known to be naturalized in Hawaiʻi, it possesses traits that warrant further evaluation. As a vigorous scrambling species adapted to wet tropical environments, it may have the potential to spread beyond cultivation under favorable conditions. Its climbing habit could allow it to compete with other vegetation if it were to establish in natural areas. At present, there is insufficient evidence to determine whether this species poses a significant invasive risk in Hawaiʻi. Ongoing evaluation is needed to determine if it could impact Hawaiʻi’s ecosystems, and caution is recommended when planting it near sensitive natural areas.
High Risk Traits:
- Thrives in tropical climates
- Roots may damage pavement
- Other Schefflera species are invasive
- May cause contact dermatitis
- Trees, small, at first erect, later becoming lofty climbers (potential to smother supporting vegetation)
- Seeds dispersed by birds, possibly other animals and intentionally by people
- Gaps in biological and ecological information may reduce accuracy of risk prediction
Low Risk Traits:
- No reports of invasiveness or naturalization, but limited evidence of widespread introduction outside native range
- Unarmed (no spines, thorns, or burrs)
- Ornamental
- Herbicides used to control other invasive Schefflera species would likely be effective if needed
