A Tree with Two Kinds of Flowers: The New Arunachal Species That Rewrote a Genus
Mitrephora rashmiae, found as a single tree in Upper Subansiri, is the first of its genus to show andromonoecy — and a reminder of how much the Eastern Himalaya still hides
What happened
Environment answers gain depth when a candidate can connect a single discovery to a bigger truth about India's biodiversity. A new tree found as one individual in a corner of Arunachal is not a trivia item — it is evidence that the Eastern Himalaya remains under-explored, that new species are still being described, and that conservation begins with knowing what exists. That framing turns a factual snippet into an analytical point.
India's Four Biodiversity Hotspots
India's Biodiversity Hotspots
| Himalaya | Northern & NW mountains |
| Indo-Burma | Eastern Himalaya & NE India — where M. rashmiae was found |
| Western Ghats | Peninsular west coast |
| Sundaland | Nicobar Islands |
Source: Thackeray Wildlife Foundation; EastMojo
Mitrephora rashmiae is a newly described tree species in the family Annonaceae (the custard-apple or soursop family), discovered in Upper Subansiri district, Arunachal Pradesh, by the Thackeray Wildlife Foundation.
●It is only the second Mitrephora species recorded from the Eastern Himalaya biodiversity hotspot — one of the world's most species-rich and under-explored regions, and part of the larger Indo-Burma hotspot.
●Its distinguishing feature is andromonoecy: the presence of both male (staminate) flowers and bisexual (hermaphrodite) flowers on the same individual plant — the first record of this reproductive strategy in the genus.
●The tree bears pale-yellow flowers with purple stripes and a dome-shaped structure formed by the inner petals; it was found at about 410 m along a forest stream between Daporijo and Taliha.
●With only a single individual known so far, it is provisionally classified 'Data Deficient' on the IUCN scale — meaning there is insufficient information to assess its extinction risk.
●New-species descriptions in India are validated against records maintained by the Botanical Survey of India (BSI), the nodal body for plant taxonomy.
A new tree known from a single individual in Arunachal underlines two things: the Eastern Himalaya is still a biodiversity frontier, and conservation cannot protect what has not yet been named.
◎ In Simple Words
Scientists exploring a remote forest in Arunachal Pradesh found a kind of tree that no one had ever officially described before. They named it Mitrephora rashmiae. What makes it special is its flowers: it has two different types on the same tree — some that are only male, and some that can make seeds — which is very unusual for its family. So far, the scientists have found just one such tree in the whole world, so they are not yet sure how rare it is. The discovery is a reminder that even today, there are still plants and animals in India's forests that we have never named, and we can only protect what we know exists.
Factual Pointers
Practice · 2 questions
The newly discovered species 'Mitrephora rashmiae' belongs to which plant family and was found in which region?
The term 'andromonoecy', highlighted as a feature of the newly discovered Mitrephora rashmiae, refers to a plant that:
Mains Practice Questions
"You cannot conserve what you have not documented." Discuss with reference to new-species discoveries in India's biodiversity hotspots and the role of taxonomy. (150 words, GS3)
The Eastern Himalaya is a biodiversity frontier under growing development pressure. Examine the conservation challenges of documenting and protecting its flora and fauna. (250 words, GS3)
Frequently Asked
· People also askWhat is Mitrephora rashmiae?
Mitrephora rashmiae is a newly described flowering-tree species of the custard-apple family (Annonaceae), discovered in the Upper Subansiri district of Arunachal Pradesh by the Thackeray Wildlife Foundation, growing along a forest stream at about 410 metres elevation.
PrelimsIt is only the second species of the genus Mitrephora ever recorded from the Eastern Himalaya biodiversity hotspot, and is named in honour of Rashmi Thackeray.
SOURCE Thackeray Wildlife Foundation; EastMojo
Why is Mitrephora rashmiae scientifically significant?
It is the first species in its genus known to show andromonoecy — bearing both male and bisexual flowers on the same tree — and only the second Mitrephora recorded from the Eastern Himalaya biodiversity hotspot. It has pale-yellow flowers with purple stripes.
GS3 · S&TDocumenting a novel reproductive strategy in a new species shows how modern taxonomy integrates reproductive biology, deepening the scientific value of each description.
SOURCE Thackeray Wildlife Foundation; EastMojo
What is andromonoecy?
Andromonoecy is a reproductive strategy in which a single plant bears both male (staminate) flowers and bisexual (hermaphrodite) flowers. It is distinct from dioecy, where male and female flowers are on separate individual plants.
PrelimsIts documentation in Mitrephora rashmiae is the first record of this strategy for the entire genus — a genuinely novel finding, not just a new locality record.
SOURCE Thackeray Wildlife Foundation
Why is the new species classified as 'Data Deficient'?
Because researchers have so far found only a single individual, there isn't enough information to assess its extinction risk — the IUCN 'Data Deficient' category. It is not a statement that the species is safe; it may in fact be very rare.
GS3Poorly-known, narrow-range species can be lost before they are ever formally assessed, which argues for a precautionary approach in fragile, under-surveyed habitats like the Eastern Himalaya.
SOURCE Thackeray Wildlife Foundation; IUCN
Which biodiversity hotspots does India have?
India hosts four global biodiversity hotspots: the Himalaya, the Western Ghats, the Indo-Burma region (including the Eastern Himalaya and Northeast, where this tree was found), and Sundaland (the Nicobar Islands).
GS3A biodiversity hotspot has over 1,500 endemic vascular plant species and has lost most of its primary vegetation — the Eastern Himalaya is among the least botanically surveyed, so new species there are still frequently described.
SOURCE Thackeray Wildlife Foundation