Introduction:Understanding coffee bean varieties not only helps you choose coffee that suits your taste preferences, but also allows you to delve deeper into the visual characteristics and flavor differences among different varieties. This article will provide a detailed introduction to the shape features, flavor profiles, and evolutionary relationships of major coffee varieties such as Typica, Bourbon, Geisha, and Caturra, while debunking common misconceptions — for example, whether Ethiopian heirloom beans are the same as Geisha. Whether you’re a beginner pour over enthusiast or looking to better understand how to adjust coffee extraction parameters, this guide offers practical reference.

Each coffee bean variety has its own unique physical characteristics. By observing the appearance of coffee beans, we can make preliminary judgments about their variety type. This article will guide readers through the shape, color, size, and other external features of coffee beans to further understand the flavor expression and traits of different varieties.

Typica (铁皮卡)

Typica is considered one of the oldest Arabica varieties, originating from Ethiopia and southern Sudan. Its top leaves are copper-red in color, hence it is also known as Red Top Coffee. Most current Arabica varieties have evolved from Typica. Typica beans are oval-shaped, long and plump in form, with a clean and refreshing taste, clear flavor layers, often featuring gentle acidity and delicate floral notes.

Bourbon (波旁)

Bourbon is a natural mutation of Typica, with its most distinctive feature being the transformation of the bean shape from the slender form of Typica to round and plump. This variety was first planted on Réunion Island in Brazil (formerly known as Bourbon Island), hence the name. Bourbon beans are relatively short and round, thick-bodied, with a smooth mouthfeel and prominent sweetness, suitable for coffee drinkers who prefer rounded flavors.

Geisha (瑰夏)

Geisha originates from the Gesha forest in Ethiopia and is one of the relatively rare varieties among many coffee types. Geisha coffee trees have growth characteristics such as long internodes and wide spacing between branches, with limited flowering and fruit yield. Its coffee beans are long and slender, with pointed ends and a full, plump center. To bring out the delicate floral and citrus flavors of Geisha, it needs to be grown in high-altitude environments with large day-night temperature variations to avoid the impact of low temperatures and frost.

Caturra (卡杜拉)

Caturra is a natural variant of Bourbon, characterized by shorter spacing between branches, smaller fruits, but higher yield per unit area. Caturra coffee beans are roundish and slightly elongated, with a slight curve at the tail end of the bean. In terms of flavor, they exhibit bright acidity and clear sweetness, making them suitable for consumers who prefer a fresh-tasting cup.

Catuai (卡杜艾)

Catuai is an artificially cultivated hybrid between Caturra and the Mundo Novo variety, combining the strengths of both parents. It inherits Caturra’s small fruit size and quality acidity, as well as Mundo Novo’s high yield and disease resistance. Catuai beans are oval and somewhat flat in shape, with a long, narrow tail. Their flavor profile includes soft acidity, a clean mouthfeel, and rich fruity aromas.

SL28 and SL34

These two varieties were cultivated by the Scott Laboratories between 1935 and 1939 and are prefixed with the code SL. SL28 belongs to the Bourbon genetic group, with short, round, and thick beans, and flavor profiles that include vibrant acidity and pronounced sweetness. SL34 falls under the Typica genetic group, with slightly flattened, oval-shaped beans, balanced acidity and sweetness, and a caramel-like aftertaste.

Heirloom (埃塞原生种)

Ethiopia boasts extremely rich coffee genetic diversity. Due to the vast number of varieties and the difficulty in classification, coupled with the local government’s intention to protect these precious resources, they are commonly referred to collectively as “Ethiopian Heirloom.” These coffee beans usually vary in size, are grown and harvested together, and often showcase intense floral, fruity aromas, and citrus acidity, making them a flavor source sought after by many specialty coffee enthusiasts.

Whether you're a beginner just getting into pour over coffee or an advanced enthusiast aiming to deeply understand the extraction parameter differences among various varieties, understanding the appearance and flavor characteristics of these coffee bean varieties can help you make more precise choices.

The above content is compiled by CoffeeHunters, a coffee news website.