Arabica (Coffea arabica)

Coffea arabica is the dominant coffee species in world trade, representing approximately 60% of global production. It is botanically unique as the only naturally tetraploid Coffea species, with 44 chromosomes — the result of an ancient hybridization between Coffea canephora and Coffea eugenioides, most likely in the highlands of Ethiopia and South Sudan. Arabica grows best at altitudes of 800–2,200 metres, in temperatures of 18–24°C. Its caffeine content (0.8–1.4% of dry bean weight) is roughly half that of Robusta, while its aromatic complexity — driven by hundreds of volatile compounds — is considerably greater. Every specialty variety recognized by World Coffee Research (Bourbon, Typica, Geisha, SL28, Pacamara, etc.) is a cultivar of Arabica.

Background & Context

Coffea arabica is the species responsible for roughly 60–65% of global coffee production and virtually all specialty coffee. It evolved in the montane forests of south-west Ethiopia and South Sudan, where it grows wild at 1,500–2,000 metres. Arabica has 44 chromosomes (tetraploid), compared to Robusta's 22, which gives it greater genetic complexity but also greater vulnerability to pests and climate. The species' defining chemical profile includes lower caffeine (0.8–1.4% vs. Robusta's 1.7–4%), higher lipid content (responsible for sweetness and mouthfeel), and a characteristic ratio of chlorogenic acids that underpins its acidity. There are hundreds of named Arabica varieties — Bourbon, Typica, Geisha, SL28, Pacamara, Caturra — each with distinct flavour expressions shaped by genetics and terroir. SCA quality scoring protocols were built around Arabica, and a score of 80+ points on the 100-point scale defines specialty grade.

Practical Use

Understanding Arabica's distinction from Robusta is foundational to reading any specialty coffee label. When a bag states "100% Arabica", it signals lower caffeine, higher inherent sweetness potential, and sensitivity to processing and roast. The specific variety within Arabica further narrows the expectation: a Bourbon from El Salvador will show different acidity than a Typica from Java or a Geisha from Panama. For home brewers, Arabica's lower caffeine means a 20g espresso shot delivers roughly 60–70mg caffeine — comparable to a 200ml pour-over. For roasters, Arabica's higher lipid content means oils migrate to the bean surface faster after roasting (visible as shine on a dark-roasted bean), accelerating staling.

Related Terms

Related terms: Robusta, Geisha, Bourbon, Typica, Specialty coffee, Terroir.