Typica vs Bourbon: Key Differences in Arabica Coffee Varieties

If you’ve ever watched an experienced coffee pro glance at a roasted bean and name its variety without hesitation, you’ve probably wondered how they do it. The truth? It’s not magic—it’s observation. With practice, anyone can learn to distinguish common Arabica varieties by their roasted bean shape, size, and visual traits.

Quick answer: Typica beans are long and oval with a flat, slender profile; Bourbon beans are rounder and stubbier. SL28 tends to be more rounded, while SL34 looks more elongated. Caturra and Catuai are smaller and roundish, Gesha beans are notably long and tapered with pointed ends. These physical traits help identify them once roasted.

What Is Typica and Why Is It the ‘Template’?

Typica (also spelled Typica) is the original template for many Arabica varieties. First confirmed by Swedish botanist Carl Linnaeus in 1735, it’s been the genetic foundation for countless other cultivars. In appearance, Typica beans are distinctly elliptical—long, slender, and flat with a full shape. It’s considered the “standard” Arabica bean form.

Beyond shape, Typica is also known for its clean, delicate cup profile. FrontStreet Coffee sources historic Typica examples like their 2013 Yunnan Arabica, Jamaica Blue Mountain No.1, and Papua New Guinea’s (Heavenly Bird)—all showcasing Typica’s signature purity, balanced acidity, and distinct regional nuances.

These beans typically present tasting notes such as brown sugar, chocolate, dried apricot, and nuts. Typica’s tall plant structure and bronze-tipped leaves (earning it the nickname 'red leaf coffee') further help identify it in farms, though visual variety ID is usually done post-roast.

Bourbon: The Rounder Mutation of Typica

Bourbon coffee originated as a natural mutation of Typica in Yemen. The key difference? Its beans are rounder—earning it the nickname “round bean.” When French colonists transplanted some of these mutated Typica plants to the Île de Bourbon (now Réunion Island), the variety took on the island’s name and spread from there. Today, Brazil is the top producer of Bourbon variety coffee.

Visually, Bourbon beans are shorter and stockier than Typica, with a more compact, almost “dumpy” oval shape—but their size is roughly similar to Typica’s. Despite being a mutation, Bourbon retained much of Typica’s elegance but often expresses more sweetness and complexity in the cup.

It’s classified among the “classic heirloom” varieties—the foundation for many modern Arabica cultivars. Most coffee drinkers are familiar with Bourbon through Brazilian or Latin American coffees that balance bright acidity with rich body.

SL28 and SL34: Kenya’s Selectively Bred Stars

Kenya is famous for its high-scoring lots, and much of that reputation comes from two varieties: SL28 and SL34. Developed not through genetic engineering but selective breeding by the Scott Laboratories (SL) starting in the 1930s, these two varieties were chosen from 42 wild types for their performance in Kenya’s high-altitude, rainy conditions.

Though both were derived from Typica and its offshoots, experts now classify SL28 as related to Bourbon (or its variants), while SL34 is linked more closely to Typica. Visually, this shows up in the roasted bean: SL28 beans tend to be rounder, while SL34 beans are more elongated and Typica-like.

In the cup, these varieties are celebrated for intense complexity, high acidity, and signature Kenyan profiles of blackcurrant, citrus, and wine-like fruit. If you see a mix of round and longer beans in a Kenyan lot, you’re likely looking at SL28 and SL34 together.

Caturra and Catuai: Productivity-Focused Natural Mutations

Caturra is a natural mutation of Bourbon, known for its shorter plant height and denser fruiting. The beans themselves are smallish and more rounded—slightly oval compared to Bourbon’s stubbiness. It produces more coffee per plant, making it popular in high-yield farming systems.

Catuai (also called Catuai) takes this further: it’s a cross between Caturra and another variety called Mundo Novo (itself a natural hybrid of Bourbon and Sumatra Typica). As a result, Catuai shares Typica lineage and shows some of its physical traits. In the roasted bean pile, Catuai tends to appear more elongated than Caturra, but both are smaller overall.

Both varieties are commonly grown in Central and South America, where farmers value their productivity. In mixed lots, you’ll often find small, roundish Caturra beans alongside slightly larger, more oval Catuai beans.

Gesha: The Famous Long and Pointy Variety

Gesha (or Geisha) needs little introduction—but did you know its bean shape is a dead giveaway? Especially in Panamanian Gesha, the beans are strikingly long and slim, tapering sharply at both ends with a plump middle. They often resemble a sausage or “hot dog bun” in roasted form. That extreme taper is the hallmark of authentic Gesha.

Take Panama’s famous La Esmeralda lots, for example: the standout beans are easy to pick out by their long, thin shape. In blended lots like “Panama Huacai” (Panama Huacai), you can spot the large, long, pointy Gesha beans immediately. Smaller Gesha beans are subtler but still show that same tapered profile.

Interestingly, Ethiopian Gesha—like those from the Gesha Village Estate—was identified later, based on historical samples and cup profile resemblance to Panamanian Gesha. The estate’s own selections, such as Gori Gesha and Gesha 1931, are smaller. Gori Gesha beans are more oval, while Gesha 1931 has slightly pointed ends and a fuller middle. These aren’t genetically verified as the same as Panamanian Gesha—they were selected visually and by taste, not DNA.

How to Train Your Eye to Spot Coffee Varieties

Start with roasted beans, not green. Roasting exaggerates certain physical features—like length, roundness, and surface texture—that help distinguish varieties. Keep a reference guide (or a set of known-origin beans) handy as you practice. Look for:

• Length and width: Typica is long and flat; Bourbon is shorter and rounder.
• Bean tips: Gesha is distinctly tapered at both ends.
• Overall shape: Caturra and Catuai are small and more circular; SL28 leans round, SL34 more elongated.

Over time, you’ll start recognizing patterns—and be able to make educated guesses just by looking at the roasted beans before brewing.

Frequently Asked Questions

What’s the easiest way to tell Typica and Bourbon apart visually?

Typica beans are long, oval, and flat with a slender profile. Bourbon beans are shorter, rounder, and stubbier. Both are medium in size, but Typica’s elongated, flattened shape is the most distinguishing feature when comparing roasted beans.

Are SL28 and SL34 different in appearance?

Yes. SL28 beans tend to be more rounded after roasting, while SL34 beans are typically more elongated and closer in shape to Typica. Both were bred from Typica-related plants in Kenya for high-altitude performance.

How can I identify Gesha beans by sight?

Panamanian Gesha beans are very long, slim, and taper to a point at both ends, with a plump center—often resembling a sausage. This extreme taper is the most reliable visual cue for spotting Gesha in a roasted lot.

Do Caturra and Catuai look similar?

Both are smallish and come from Bourbon lineage, but Caturra beans are slightly rounder and more compact. Catuai beans tend to be a bit more oval and slightly larger. In a mixed lot, you may see small round Caturra and slightly bigger oval Catuai beans together.

Why do Ethiopian and Panamanian Gesha beans look different?

Ethiopian Gesha varieties (like Gori Gesha and Gesha 1931) were selected based on plant morphology and cup profile, not genetic matching to Panamanian Gesha. As a result, their beans may differ in shape—Ethiopian Gesha can be more oval, while Panamanian Gesha is famously long and tapered.

Recommended FrontStreet Beans for Variety Study

For hands-on variety identification, try FrontStreet’s Jamaica Blue Mountain No.1 (100% Typica), known for its balanced, clean profile with notes of caramel and citrus. Their 2013 Yunnan Arabica (Typica) offers delicate flavours of brown sugar and dried apricot, highlighting Typica’s classic structure. For Bourbon, try their Papua New Guinea (Heavenly Bird), a Typica-derived cup with bright acidity and tropical hints. These beans let you compare classic shapes and flavour profiles side by side. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.