Henckelia monophylla Rediscovered After 189 Years: Rare Plant Found in Arunachal Pradesh’s Lohit District
Botanical Survey of India (BSI) scientists have rediscovered the rare perennial herb Henckelia monophylla in Lohit district, Arunachal Pradesh, after it was last documented nearly 189 years ago in 1837. This significant find during a field survey in the Eastern Himalayas underscores the region’s unexplored biodiversity and the value of sustained botanical expeditions.
Discovery Timeline and Background
Henckelia monophylla was first collected in 1837 by British botanist William Griffith and remained undocumented until BSI researchers rediscovered it in Lohit district during a recent floral expedition in the Mishmi Hills. The gap of nearly 189 years classifies it as a “lost” species, now resurfacing in Arunachal Pradesh’s humid forests.
Arunachal CM Pema Khandu hailed the achievement, noting it as a “remarkable rediscovery” adding to the state’s ecological treasures and global botanical knowledge.
Botanical Characteristics
Henckelia monophylla belongs to the Gesneriaceae family (African violet family), known for ornamental herbs with tubular flowers. As a perennial herbaceous plant, it thrives in humid forest microhabitats:
- Habit: Erect or slightly creeping stems, simple ovate/lance-shaped leaves.
- Flowers: Axillary inflorescences bearing one or several tubular/funnel-shaped blooms in delicate bluish-purple or white hues.
- Reproduction: Elongated capsules with numerous tiny seeds.
- Habitat: Shaded, moist rock faces or near waterfalls in tropical evergreen forests of Eastern Himalayas.
Its rarity stems from a highly specific ecological niche in biodiversity hotspots like Lohit district.
Location: Lohit District, Arunachal Pradesh
Lohit district in eastern Arunachal Pradesh is part of the Eastern Himalayas biodiversity hotspot, featuring tropical evergreen forests, Mishmi Hills and high endemism. The rediscovery site highlights the region’s role as a refuge for “lost” species, with similar finds like Lysionotus namchoomii (another Gesneriad).
Arunachal harbours over 5,000 flowering plant species, many endemic, but faces exploration gaps due to remote terrain and infrastructure development.
Significance for Biodiversity and Science
Taxonomic and Conservation Value
The rediscovery enables:
- Updating Flora of India records and DNA barcoding to trace Henckelia genus evolution (40+ species, many Himalayan endemics).
- Potential IUCN status as Critically Endangered (CR) or Data Deficient due to narrow distribution.
It reveals “taxonomic gaps” in Northeast India, where many presumed-extinct species persist in unexplored pockets.
Threats and Conservation Needs
- Habitat loss: Road construction and hydropower projects fragment microhabitats.
- Climate change: Altered moisture regimes threaten specialized niches.
- Recommendations: Protected Area status, sustained BSI surveys, and community involvement in monitoring.
BSI emphasizes continued field surveys in Arunachal, one of India’s richest biodiversity hotspots.
Related Recent Discoveries in the Northeast
This follows:
- Osbeckia zubeengargiana (new species, Melastomataceae) in Assam’s Manas NP (2026).
- Lysionotus namchoomii (rare Gesneriad) in Arunachal.
These underscore Northeast India’s role in global botany, with Arunachal alone hosting 25% of India’s flowering plants.
UPSC Relevance: Environment and Ecology
Prelims:
- Eastern Himalayas hotspot, Gesneriaceae family, BSI role.
- E.g., “Henckelia monophylla belongs to: (a) Orchidaceae (b) Gesneriaceae (c) Melastomataceae (d) Ranunculaceae.”
Mains (GS-III):
- Biodiversity hotspots, endemism, conservation vs. development in Northeast.
- “Rediscoveries like Henckelia monophylla highlight the need for intensified surveys and protected status in Himalayan hotspots. Discuss.”
Key Features Table
FAQs on Henckelia monophylla Rediscovery
In Lohit district, Arunachal Pradesh, during a BSI field survey in the Mishmi Hills region.
Nearly 189 years, since its first documentation in 1837 by William Griffith.
Gesneriaceae, known for African violets; perennial herb with tubular flowers.
Thrives in specific humid forest microhabitats; erect/creeping stems, axillary inflorescences.
Highlights Eastern Himalayas’ unexplored biodiversity, updates botanical records, flags conservation needs.
Arunachal CM Pema Khandu praised BSI for the “remarkable” rediscovery.
Biodiversity hotspots, endemism, Northeast ecology; GS-III Environment syllabus.
Critically Endangered or Data Deficient due to narrow range and threats. Q1. Where was Henckelia monophylla rediscovered?
Q2. How long was it “lost” to science?
Q3. What family does it belong to?
Q4. What makes it unique?
Q5. Why is this significant?
Q6. Who congratulated the team?
Q7. UPSC angle?
Q8. Conservation status likely?
