Stenophylla: The Rediscovered Coffee Species

Stenophylla is a once-abandoned West African coffee species that researchers rediscovered growing wild in Sierra Leone in 2019–2020. A 2021 study found its flavor comparable to arabica's while showing notably better heat tolerance, which is why it draws outsized attention from climate-focused coffee researchers despite still being essentially unavailable to buy.

What is Coffea stenophylla?

Coffea stenophylla is a shrub or small tree, generally 3 to 6 meters (10–20 ft) tall, with glossy, narrow leaves around 4 to 10 cm long and white flowers, according to Wikipedia's summary of the species. One easy way to tell it apart from arabica in the field: its ripe cherries turn dark purple, almost black, rather than the red typical of arabica.

Where does stenophylla coffee grow?

Stenophylla is native to the West African forest belt, in and around Guinea, Ivory Coast, Liberia and Sierra Leone, per Wikipedia's summary of the species. It was first documented scientifically in the 18th century by the Swedish botanist Adam Afzelius and formally described in 1834 by the British botanist George Don. Seeds reached Kew Gardens by 1894 and were later trialed in Trinidad, where the plants fruited successfully and growers praised the resulting coffee's quality by the late 1890s. Kew's own Bulletin of Miscellaneous Information documented the Sierra Leone trade in "highland coffee," as stenophylla was then known, as early as November 1896, describing local growers' long-standing familiarity with the plant.

Why was stenophylla abandoned, and how was it rediscovered?

Despite that early praise, stenophylla never became a commercial crop at any real scale. Its low yield and small berries made it uneconomical next to arabica and robusta, and cultivation faded out over the 20th century — by 2018, field surveys in Sierra Leone found no commercial stenophylla plantings left at all, according to Wikipedia's summary of the species.

A research team led by Kew botanist Aaron Davis went looking for surviving wild plants and located them in 2019 and 2020, publishing the find in Frontiers in Plant Science in 2020 under the title "Lost and Found: Coffea stenophylla and C. affinis, the Forgotten Coffee Crop Species of West Africa."

What did the 2021 flavor research find?

Once researchers had located living stenophylla plants, the next question was whether the coffee was actually any good. A follow-up sensory and agronomic study, led by Davis and colleagues and published in Nature Plants in 2021 under the title "Arabica-like flavor in a heat-tolerant wild coffee species," evaluated the rediscovered coffee and described it as complex and naturally sweet, with medium-high acidity, fruitiness and a good mouthfeel — qualities trained tasters found broadly comparable to arabica rather than to robusta, according to Wikipedia's summary of the research.

The same body of research pointed to another advantage: stenophylla appears able to tolerate meaningfully warmer growing conditions than arabica, a trait that has made it a case study in climate-resilient coffee breeding ever since. Comprehensive caffeine figures for stenophylla aren't well documented in the sources available, so they're left out here rather than guessed at.

Can you buy stenophylla coffee today?

Not really, at least not yet. As of the most recent published reporting, stenophylla remains outside commercial cultivation, and the IUCN Red List classifies the wild species as Vulnerable, largely because deforestation continues to threaten the Sierra Leone forest patches where it survives, according to Wikipedia's summary of the species. That conservation status sits awkwardly alongside the plant's research profile: a species rare and threatened enough to warrant protection is, at the same time, one of the most closely watched candidates in coffee-breeding science.

That combination — genuinely promising flavor and climate research, paired with a species that essentially doesn't exist in commerce — is why stenophylla shows up more often in coffee-science coverage than on any retailer's shelf. Shoppers looking for a coffee to actually drink today are better served browsing rare coffees that, unlike stenophylla, are already in the market.

How does stenophylla compare with Jamaica Blue Mountain?

Stenophylla and Jamaica Blue Mountain are both linked to scarcity, but for very different reasons. JBM is scarce because it comes from a small, legally defined growing area that is already fully planted and in commercial production; stenophylla is scarce because it barely exists in cultivation at all, decades after being abandoned. JBM's mildness and balance are documented by a century of trade, discussed further on arabica coffee; stenophylla's arabica-like sweetness is, so far, mostly documented in a single research study rather than in the wider market.