Family: Solanaceae
Brunfelsia densifolia, commonly known as serpentine hill raintree, is a flowering shrub native to Puerto Rico, where it grows naturally on serpentine soils. This compact, evergreen plant features glossy green leaves and clusters of bright yellow, tubular flowers that attract pollinators and provide a vivid splash of color in the landscape. Because of its showy blooms and ability to thrive in poor or rocky soils, it is often cultivated as an ornamental shrub and used in gardens as a hedge, border plant, or striking specimen.
In Hawai‘i, Brunfelsia densifolia is not known to be naturalized or invasive. It has not shown aggressive spread in areas where it is grown, and there is currently no evidence of ecological impact. As with other members of the nightshade family, parts of the plant may contain toxic compounds and should not be ingested by pets or livestock. With responsible planting and routine observation, the species is considered low risk for cultivation in Hawai‘i.
High Risk Traits:
- Climate-suited to tropics/subtropics
- Shade-tolerant
- Sold as an ornamental (human-dispersed)
- Self-compatible
Low Risk Traits:
- Very low reproductive output
- Not naturalized outside native range
- Requires specialist pollinators
- No vegetative reproduction
- Poor natural dispersal (fruit drops near parent)
- Restricted to serpentine soils
- No spines or thorns
