Guwahati: A striking new species of cobra lily has been discovered in the remote Tlangpui peak area of southern Mizoram, adding to the rich botanical heritage of the Indo–Burma biodiversity hotspot.
The species, named Arisaema siahaense, has been formally described by botanists Rabishankar Sengupta and Sudhansu Sekhar Dash of the Botanical Survey of India in the Nordic Journal of Botany.
Discovered during floristic expeditions in 2023 and 2025, in Siaha district, the plant stands out for its dramatic whip-like floral structure, a pendulous spadix appendage measuring 15–21 cm, covered with long bristle-like projections. The plant grows up to 1.08 metres tall and bears a trifoliate leaf emerging from a subglobose tuber, distinguishing it from closely related species found in China and Southeast Asia.
According to the study, the species belongs to the ‘Fimbriata’ section of the genus Arisaema, commonly known as cobra lilies due to their hooded spathe resembling a rearing snake. India is home to more than 55 species of Arisaema, many concentrated in the Northeast, but this newly described taxon is currently known only from a narrow elevation range of 1,563–1,617 metres in the Tlangpui peak area of Siaha district.
Researchers note that the plant is strictly dioecious, meaning male and female flowers occur on separate plants, and does not show the sex-changing tendencies observed in some other Arisaema species. Its long filamentous appendage is believed to play a crucial ecological role in attracting specific pollinators, although further studies are needed to confirm this.
However, the discovery also raises conservation concerns. The species is currently known only from its type locality near Lungzarh?um village and faces threats from habitat disturbance, road expansion, grazing, and invasive alien species. Due to limited data, it has been provisionally assessed as ‘Data Deficient’ under IUCN criteria.
The species name siahaense honours Siaha district, acknowledging both its ecological richness and the role of local communities in biodiversity conservation.
The finding once again highlights Mizoram’s status as a botanical treasure trove and underscores the urgency of documenting and protecting species that may exist nowhere else on Earth.