A team of Filipino and international botanists has identified a new Begonia species, Begonia ilinensis, discovered clinging to the coastal limestone cliffs of Ilin Island, just off the southwestern coast of Mindoro.
The discovery, published in the scientific journal Taiwania, adds a unique entry to the Philippines’ rich biodiversity. Unlike many of its relatives, Begonia ilinensis has developed a specialized survival mechanism to endure the region’s harsh dry season.
According to the research team led by botanist Mark Angelo C. Bucay, the plant undergoes a period of seasonal dormancy.
During the dry months, the species survives only as tiny underground rhizomes, appearing to vanish from the landscape. It re-emerges with reddish young leaves and small white blooms at the onset of the rainy season, typically between June and November.
“This discovery underscores the ecological importance—and fragility—of coastal limestone habitats,” the researchers noted.
These environments, often referred to as “karst” ecosystems, are frequently understudied and are particularly vulnerable to environmental changes and human activity.
Morphologically, Begonia ilinensis is smaller than most other species in the Baryandra section, a group of begonias largely endemic to the Philippine archipelago.
While it resembles Begonia luzonensis found on the neighboring island of Luzon, it is distinguished by its more compact size and specific leaf margins.
Beyond the identification of the new species, the study mapped similar coastal begonias across the Philippines. Researchers believe these findings provide “new insights into how these begonias adapted to harsh coastal ecosystems and how rapid evolution occurred across the archipelago.”
The team included experts from various institutions, including Danilo N. Tandang and Mikko Angelo G. Reyes, who emphasized that the unique limestone formations of Mindoro continue to be a significant frontier for botanical discovery.