Coffea stenophylla is a wild West African coffee species that tastes like high-quality arabica but grows in mean annual temperatures 6.2 to 6.8 °C hotter than arabica can tolerate. That is the finding of Davis, Mieulet, Moat, Sarmu and Haggar, “Arabica-like flavour in a heat-tolerant wild coffee species”, Nature Plants 7, 413–418 (2021). In a blind evaluation, 81 per cent of the tasters said the stenophylla sample was arabica. (That percentage, and the fact that 18 experts took part in total — a CIRAD panel plus specialists sent samples separately — come from the authors’ own write-up of the study rather than from the paper’s abstract.) It is not yet a commercial crop, and almost nothing you can buy today is stenophylla.
Table of Contents
This page previously published three tables of numbers that were not real
They have been deleted rather than corrected, because correcting an invented table into a different invented table is not an improvement. What was on this page, and why each one had to go:
- A “Flavor Profile Ratings” table scoring stenophylla and arabica out of 10 on fruitiness, sweetness, acidity and body, described as “based on expert tasting panels”. No such panel produced those scores. There was a real sensory panel — described below — and it did not work on a 1-to-10 attribute scale or produce anything resembling those numbers. Presenting invented scores as panel data is the worst thing a coffee page can do, and this one did it.
- A “Nutritional Profile” table giving caffeine content as “1.2 mg/100g” for stenophylla and “1.5” for arabica. Those units are impossible. Arabica caffeine is usually reported as a percentage of dry weight — around 1.2 per cent, which is 1,200 mg per 100 g, a thousand times the figure printed here. The chlorogenic acid, lipid and protein figures in the same table had no source either. We have not found a caffeine measurement for C. stenophylla in a source we have read, so this page prints no caffeine figure at all rather than a plausible-looking one.
- A “Climate Tolerance” table giving stenophylla a maximum temperature tolerance of 30 °C against arabica’s 29 °C. A one-degree advantage is not the finding, and it badly understates the point of the species. The published figure is a gap of 6.2 to 6.8 °C in mean annual temperature — a difference that changes which countries can grow premium coffee, not a rounding.
- It also said stenophylla “prospers in well-drained soils often found in high-altitude areas like Sierra Leone and Liberia”. Stenophylla is a lowland species; that is much of why it matters. The 2025 genetics survey below collected its wild Sierra Leonean material at 375 m, 416 m and 466 m above sea level. For comparison, our page on Kenyan coffee puts that country’s arabica at roughly 1,400–2,100 m.
- Three of its internal links were written with a category folder in the path, which this site’s permalinks do not use, so each one burned a redirect. Every link on this page is now in the site’s flat form.
What the research actually found
Coffea stenophylla is native to Upper West Africa and had been effectively lost to cultivation for most of a century. Researchers relocated it growing wild in Sierra Leone, and also worked with material originally from Ivory Coast that had been kept alive in a collection on Réunion. Both sources went into the 2021 study.
Heat tolerance
The paper’s abstract states that stenophylla grows and crops under the same rainfall conditions as robusta and Liberica, but at mean annual temperatures 6.2 to 6.8 °C higher than arabica. Writing up their own work, the authors put the absolute figure at a mean annual temperature requirement of 24.9 °C, “which is 1.9 °C higher than robusta, and a staggering 6.2–6.8 °C higher than Arabica.”
Note carefully what that figure is and is not. It is a mean annual temperature for the climate the plant grows in — not a peak temperature it survives, and not a heat-shock threshold. It says stenophylla can be farmed in places arabica cannot be farmed at all. It does not say a stenophylla tree will shrug off a heatwave that kills an arabica tree next to it.
| Species | Mean annual temperature it grows at |
|---|---|
| C. stenophylla | 24.9 °C |
| Robusta | 1.9 °C below stenophylla |
| Arabica | 6.2–6.8 °C below stenophylla |
The sensory panel that really happened
The Sierra Leone sample was first tasted by Union Hand-Roasted Coffee in London. A full evaluation of the Ivory Coast sample was then run in 2020 by CIRAD at its sensory analysis laboratory in Montpellier, with a panel of 18 judges assessing stenophylla alongside arabica and robusta. Asked whether the stenophylla sample represented arabica, 81 per cent said yes. The authors describe the profile as complex, with natural sweetness, medium to high acidity, fruitiness and good body.
Daily Coffee News, reporting on the same tasting, gives the stenophylla sample an SCA cupping score of 80.25 — over the 80-point speciality threshold — and notes the caveat that matters most: this was wild coffee, “wild plants selected at random and crudely processed”, not a cultivated and carefully prepared lot. The score is a floor for what the species might do, not a ceiling.
This site has not tasted stenophylla. Nobody reading this page is likely to have the chance to soon. Everything above is what a published panel reported, and it is presented as their result rather than ours.
Where it grows
A 2025 genetics study of wild Sierra Leonean stenophylla — Lahai and colleagues, “Genetic basis of phenotypic diversity in C. stenophylla“, Frontiers in Genetics — records its collection sites at 375 m, 416 m and 466 m above sea level. That is lowland forest. Arabica’s quality reputation is built on high-altitude farming, where cooler temperatures slow cherry development; stenophylla appears to deliver an arabica-like cup without needing the altitude. If it holds up under cultivation, that is the commercially interesting part.
A taxonomy note, because this gets muddled
Coffea stenophylla is its own species. It is not a variety of arabica, not a variety of robusta, and — despite sharing a West African range — not part of the Liberica group. That last point matters because the Liberica group has recently been reclassified, with C. liberica split into three species including C. dewevrei, the coffee sold as excelsa. Our page on excelsa coffee beans covers that reclassification and its sources; it has nothing to do with stenophylla, and the two questions should not be run together.
For the species you can actually buy, see arabica coffee beans, robusta coffee beans and liberica coffee beans.
Why anyone cares
Arabica supplies most of the world’s speciality coffee and is fussy about temperature. As growing regions warm, the land that suits arabica shrinks and moves uphill, and there is only so much uphill. A species that produces an arabica-like cup at 24.9 °C mean annual temperature, at low elevation, widens the map rather than shifting it. Our page on the climate change impact on coffee farming covers the pressure this is a response to.
What stands between that idea and a bag on a shelf is ordinary and considerable: stenophylla has essentially no agronomic package behind it — no established yields, no disease-resistance data at scale, no processing conventions, no supply chain, and no buyers used to asking for it. The 2025 genetics work above exists precisely because breeders need a genetic map before they can select cultivars. Expect years, not months.
If you ever get hold of some
Treat it as you would an arabica of unknown origin. Start at 55 g of coffee per 1 litre of water — about 1:18 by weight, the standard brew ratio in SCA Standard 310-2021, Home Coffee Brewers, section 7.1.5: “The standard brew ratio of 55 g of coffee per 1.000 kg of 17±3°C water”. Remember that a coffee “cup” is 6 fl oz rather than 8, and that stronger means more coffee, not less. For water temperature see our page on the best temperature for French press coffee. A filter method suits a coffee described as sweet, fruity and medium-to-high in acidity better than espresso does — but this is reasoning from the panel’s descriptors, not from a cup anyone here has drunk.
One last warning about sourcing. Because stenophylla is famous and scarce, the name is worth more than the coffee is available. If a retailer offers it, ask which population or collection it came from and expect a specific answer.
