Guwahati: Arunachal Pradesh, the northeastern frontier of India, has once again proven to be a cradle of botanical wonders with the discovery of Piper kiminensis, a new species of climbing vine belonging to the Piperaceae family.
With its striking shingling, variegated leaves and limited population, this plant adds a unique dimension to the rich biodiversity of the Eastern Himalayas.
“It has been almost six years since I first encountered this remarkable plant,” recalls Dipankar Borah, one of the study’s co-authors. “The discovery happened in one of our most frequented botanizing sites—Kimin. Over the years, I have visited this place multiple times, sometimes with my non-botanist friends, sometimes with Momang, and occasionally with my juniors. In 2022, during a trip with Momang to observe Begonia medogensis in bloom, we came across this striking plant again—at the same spot where we had last seen it. Its sheer beauty makes it impossible to ignore.
One might mistake it for a horticultural hybrid that had escaped into the wild—so vivid, with two of the most common colours blending in a mesmerizing pattern: white and green. As we were capturing its beauty through our lenses, Momang noticed something at the top of a small cliff. ‘Check this other Piper—it’s flowering!’ she exclaimed. To our astonishment, two Piper species were coexisting in the same spot. But what shocked us even more was that, upon closer observation of the basal stems, we realized that the same creeping Piper had developed erect branches with completely different leaves. This was something we had never noticed before. We had always searched for flowers in the axils of the creeping plant, unaware that it followed a different flowering pattern altogether.”
The moment of realization led Borah and his colleagues to immediately contact Padma Raj Gajurel, a leading botanist at NERIST. “Gajurel Sir was visibly thrilled as he examined the samples. ‘I have been after this species since 2003!’ he exclaimed.” Gajurel had first spotted it in Kimin but had never had the opportunity to see it flower again. After years of dedicated efforts, the species was finally described and named Piper kiminensis in honor of the place of its discovery. The discovery was made possible through the collaborative research of Padma Raj Gajurel, Tage Yakang, Soyala Kashung, and Dipankar Borah, who co-authored the scientific paper documenting the species.
Despite its unique characteristics, Piper kiminensis faces an uncertain future. The species is currently known only from a single locality, where it was found in a tropical evergreen forest at an elevation of approximately 800 meters. Habitat destruction due to road construction and deforestation threatens its existence, with only 12 individual plants documented within a 10-square-kilometer area. Alarmingly, only two of these were mature male plants, and the female counterpart remains elusive, raising concerns about natural regeneration.
Recognizing the vulnerability of Piper kiminensis, researchers have proposed classifying it as Critically Endangered under the International Union for Conservation of Nature (IUCN) criteria. Ex situ conservation efforts have already begun, with propagation initiatives undertaken at the Department of Biotechnology’s Arunachal Pradesh State Council for Science and Technology (DBT-APSCS&T) and the Forestry Department of the North Eastern Regional Institute of Science and Technology (NERIST).
Molecular analysis of the species has revealed intriguing evolutionary connections. The internal transcribed spacer (ITS) sequence analysis indicates that Piper kiminensis shares distant genetic links with Piper infossibaccatum, Piper thomsonii, and Piper boehmeriifolium, yet remains highly distinct from them.
Phylogenetic studies place it within a clade of Southeast Asian Piper species, further underscoring the interconnected biodiversity of the Indo-Malayan region.
The discovery of Piper kiminensis reinforces the importance of continued botanical exploration in the biodiverse landscapes of northeastern India. With the region undergoing rapid infrastructural development, proactive conservation strategies must be prioritized to protect such unique and fragile species before they vanish.
As scientists work to locate additional populations and understand the ecological role of this remarkable plant, Piper kiminensis serves as both a symbol of nature’s hidden treasures and a reminder of the delicate balance that must be preserved in our ecosystems. The challenge now is to ensure that this newly discovered species does not become a fleeting marvel but rather a well-preserved chapter in the story of Arunachal Pradesh’s botanical heritage.
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