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‘Mystery plant’ in the Amazon is finally confirmed as a new species

'Mystery plant' in the Amazon is finally confirmed as a new species

A ‘mystery plant’ discovered in the Amazon rainforest nearly 50 years ago has finally been confirmed as a new species.

The original 20-foot specimen was discovered by Robin Foster, a retired curator at Chicago’s Field Museum, in Peru’s Manu National Park back in 1973. 

Scientists couldn’t declare it a new species for so long because they couldn’t tell what family it belonged to. 

But now, thanks to DNA analysis, they’ve finally given it a name, Aenigmanu alvareziae, as well as a full description in a new research paper.

The attractive plant species is notable for its tiny, delicate orange fruits, which are said to be shaped like Chinese paper lanterns, and white flowers.  

A specimen of a leaf and tiny orange fruit from the ‘mystery plant’, now christened Aenigmanu alvareziae

An Aenigmanu alvareziae plant in the Amazon rainforest. Although Aenigmanu alvareziae is new to scientists, it has long been used by the Indigenous Machiguenga people

The original 20-foot specimen was discovered by Robin Foster, a retired curator at Chicago’s Field Museum, in Peru’s Manu National Park back in 1973


Species: Aenigmanu alvareziae 

Genus: Aenigmanu 

– Small, edible orange fruits. 

– A gracefully branched (rather spindly) understory tree or shrub – i.e. growing in the shade of large trees

– The leaves are very plain and simple, like leaves of Magnolia. They ‘have no distinguishing features’

– The plant sprouts from the base to form small clumps

– The tiny white flowers in small clusters are not conspicuous 

– Grows on rich fertile soils of high floodplain. These soil types are often used for indigenous agriculture, so undisturbed habitat of this type in Amazon is rare

Source: Nancy Hensold et al 

Although Aenigmanu alvareziae is new to scientists, it has long been used by the Indigenous Machiguenga people. 

‘When I first saw this little tree, while out on a forest trail leading from the field station, it was the fruit – looking like an orange-coloured Chinese lantern and juicy when ripe with several seeds – that caught my attention,’ said Foster, now a researcher with the Smithsonian Tropical Research Institute. 

The attractive fruit is said to be edible, with something of a ‘sweet and creamy’ taste, the researchers told CNN – but it’s unlikely to become a food source for humans.   

The genus name of the new plant, Aenigmanu, means ‘mystery of Manu’, while the species name is in honour of Patricia Álvarez-Loayza, who collected the first specimens used for the genetic analysis.  

When Foster first stumbled upon the plant in 1973, he thought it looked unlike anything he’d ever seen. 

‘I didn’t really think it was special, except for the fact that it had characteristics of plants in several different plant families, and didn’t fall neatly into any family,’ he said

‘Usually I can tell the family by a quick glance, but damned if I could place this one.’  

At the time, Foster collected samples of the plant’s leaves and fruits, but all the scientists he showed them to had no idea what it was either.

Not only were they unable to identify the plant as a previously-described species, but they couldn’t even declare it a new species, because they couldn’t tell what family it belonged to. 

Foster showed a dried specimen of the plant to Nancy Hensold, a botanist at the Field Museum, more than 30 years ago.   

A recent shot of Aenigmanu alvareziae in the Amazon rainforest. The identity of the species has for nearly 50 years been flummoxing scientists

Pictured, the white flower on the female Aenigmanu alvareziae plant. The leaves of the plant are ‘very plain and simple, like leaves of Magnolia’


Two fifths of the world’s plants are at risk of extinction, up from an estimated fifth in 2016, according to Kew Gardens. 

Kew’s State of the World’s Plants and Fungi report for 2020 classified species at risk of extinction, including 723 plants we use for medicine

In total, 140,000, or 39.4 per cent, of plants are threatened, up from an earlier estimate of 21 per cent from 2016, it found.  

The biggest threat to plants is the clearance of natural habitats such as rainforest for agriculture, Kew experts claimed. 

Scientists are now in a ‘race against time’ to find and save new species before they vanish.    

‘I came to work at the Field Museum in 1990, and Robin showed me this plant,’ she said. 

‘I tried to get it identified using little fine technical characters like boiling up the ovaries of the flowers and taking pictures of the pollen, and after all that, we still didn’t know. It really bugged me.’

The mystery plant sat in the Field Museum’s herbarium, a library of dried plant specimens, for years, but it wasn’t forgotten about. 

Luckily, Hensold and her colleagues eventually got a grant to study the plant, funded by the Field Museum’s Women’s Board.

The team attempted to analyse the plant’s DNA using the dried specimens, but these efforts proved fruitless, because DNA testing doesn’t work on some dried material. 

So they enlisted the help of Álvarez-Loayza, a scientist who works in the Manu National Park and has spent years monitoring the forest there.

Álvarez-Loayza found a fresh specimen of the plant, which was sent to the Field Museum’s Pritzker DNA Laboratory for genetic analysis.

Researchers were shocked by what they found; specifically the family that the plant belongs to – Picramniaceae. 

This was a ‘big deal’ because the mystery plant didn’t look anything like its closest relatives, other plants in the Picramniaceae family, at least at first glance.  

Left to right, scientists Nancy Hensold, Patricia Álvarez-Loayza, and Robin Foster are pictured working in the Field Museum’s herbarium

‘When my colleague Rick Ree sequenced it and told me what family it belonged to, I told him the sample must have been contaminated. I was like, no way, I just couldn’t believe it,’ said Hensold.  

‘Looking closer at the structure of the tiny little flowers I realised, oh, it really has some similarities but given its overall characters, nobody would have put it in that family.’ 

Aenigmanu alvareziae is is closest related to another genus in the Picramniaceae family, called Nothotalisia, which was only described 10 years ago.

‘Nothotalisia has smooth rounded fruits of a similar colour, compound leaves (many-segmented, like walnut leaves), and elongate spikes of flowers,’ Hensold told MailOnline.

‘Like the other two genera of PIcramniaceae, it lacks stipules – small scales at the base of the leaf stalk, the presence or absence of which is usually significantly important in family identification.’  

Other plants in the Picramniaceae family are known for their anti-cancer properties, so further research on Aenigmanu alvareziae could reveal similar qualities.  

The research paper has been published this week in the journal Taxon


A plant species discovered deep in a Hawaiian rainforest may be the only one of its kind, experts revealed in 2020. 

Named Cyanea heluensis, the flowering plant was spotted in a part of West Maui by botanists exploring the steep slopes of Helu above Lahaina.

The large plant is similar to other native vegetation on the island known as hāhā, but this one has ‘gently curved, long white flowers’ that some Facebook users likened to uncooked French fries.

A new plant species has been discovered deep in a Hawaiian rainforest that experts say may be the only one of its kind

Because surveys have failed to locate any more of the Cyanea heluensis, experts have removed a new growth from the plant that will be used to propagate more in a nursery before it is eaten by goats or destroyed during a weather event.

Cyanea heluensis is now added to the list of species being managed by the University of Hawaii’s Plant Extinction Prevention Program, the state said. 

This content was originally published here.