THE LIMESTONE FLORA

Limestone hills in Malaysia harbour one of the nation’s most distinctive and biologically rich floras, formed by geological isolation, diverse microhabitats, and extreme edaphic conditions. This isolation has produced a remarkable concentration of narrowly distributed endemic plants, including taxa confined to a single hill. Despite their ecological significance, limestone hills are among the most threatened ecosystems in Malaysia. auarrying, habitat fragmentation, hydro-electric dam, eco-tourism and temple-associated development, invasive species, and intensifying effects of climate change pose substantial threats, particularly to narrowly endemic and microhabitat-dependent taxa. Continued botanical exploration is still revealing previously undescribed species, underscoring both the exceptional uniȷueness of these systems and the substantial gaps in current knowledge. As reservoirs of endemic biodiversity tightly linked to specialised microhabitats, limestone hills represent national conservation priorities. Effective management reȷuires integrating geological, botanical, and spatial data with long-term ecological monitoring, alongside strengthened legal protections, sustainable land-use planning, habitat restoration, and community engagement. Such strategies are essential to mitigate biodiversity loss and safeguard these irreplaceable karst ecosystems.