The Coffee Family Tree Explained

by Marcus McCombe | Sep 25, 2026

TL;DR

The coffee family tree begins with the genus Coffea, which contains 120 to 130 species. Of these, only four matter commercially: Arabica, Robusta (Canephora), Liberica, and Eugenioides. Arabica itself is a hybrid of Robusta and Eugenioides, born tens of thousands of years ago in Ethiopia. From Ethiopia, Arabica left through two lineages, Typica and Bourbon, which diversified through mutation, hybridisation, and deliberate breeding into the hundreds of varieties grown today. This guide maps how they all connect.

The Genus: 130 Species, Four That Matter

Coffee belongs to the genus Coffea in the family Rubiaceae. Botanists have identified 120 to 130 species within the genus, most of them wild, uncatalogued, and found in the forests of Africa and Madagascar. Moreover, the vast majority have never been evaluated for cup quality or commercial potential.

Of those 130 species, only four have any relevance to the coffee you drink:

Coffea arabica (Arabica). Approximately 60 percent of global production. The species behind virtually all specialty coffee. Complex, aromatic, nuanced. Grows at altitude. Vulnerable to disease.
Coffea canephora (Robusta). Approximately 40 percent. Strong, bitter, disease-resistant. Higher caffeine. Grows at lower altitudes. Used primarily in instant coffee, commercial blends, and Italian espresso. Also one of Arabica’s two parent species.
Coffea liberica (Liberica). Less than 2 percent. The largest beans and tallest trees in commercial coffee. Bold, smoky, and divisive. Culturally important in the Philippines (Kapeng Barako) and Malaysia.
Coffea eugenioides (Eugenioides). Negligible commercial production. Intensely sweet, almost no bitterness, very low caffeine. Arabica’s other parent species. A handful of producers in Colombia now grow it as a specialty curiosity.

The remaining 120+ species are wild. However, they represent untapped genetic diversity that may hold traits (heat tolerance, disease resistance, drought tolerance) critical for the future of coffee as climate change reshapes growing conditions worldwide.

The Origin: How Arabica Was Born

The most important event in the coffee family tree happened tens of thousands of years ago in the highlands of southwestern Ethiopia. Two species cross-pollinated:

Coffea canephora (Robusta), the strong, bitter, high-caffeine parent, crossed with Coffea eugenioides, the sweet, delicate, low-caffeine parent. Their offspring doubled its chromosomes from 22 to 44 and became a new tetraploid species: Coffea arabica.

Arabica inherited sweetness and delicacy from Eugenioides. It inherited vigour and resilience from Robusta. The combination created a species with more flavour complexity than either parent, which is why Arabica dominates specialty coffee while neither parent does on its own. Moreover, this means every cup of Arabica, from the most expensive competition Gesha to the most affordable washed Colombian, carries both Robusta and Eugenioides genetics inside it.

For the full origin story, read our guide on what Arabica coffee is.

The Two Great Lineages

Arabica grew wild in Ethiopia’s forests for thousands of years, diversifying into thousands of local populations. Then, probably in the fifteenth or sixteenth century, coffee seeds left Ethiopia for Yemen. From Yemen, two lineages spread across the world:

Typica. Travelled east from Yemen to India and Indonesia (via the Dutch), then to the Amsterdam Botanical Garden, then to France, and finally to the Americas in the 1720s. Typica produces clean sweetness, bright acidity, and delicate complexity. Nearly every Typica tree in the Americas traces back to a handful of plants.
Bourbon. Travelled from Yemen to Île Bourbon (now Réunion) in the Indian Ocean in the early 1700s. Isolated on the island, it evolved into a genetically distinct variety. Bourbon produces caramel sweetness, red fruit, and a rounded body. From Réunion, it spread to East Africa and Latin America.

These two lineages, Typica and Bourbon, form the trunk of the modern coffee family tree. Together, they are the ancestors of the vast majority of commercially grown Arabica worldwide. However, they represent only a tiny fraction of the genetic diversity that exists in Ethiopia’s forests. This narrow genetic base is Arabica’s greatest vulnerability.

The Typica Branch

Typica diversified through natural mutation, natural hybridisation, and deliberate breeding:

Maragogype. A giant-bean mutation of Typica from Brazil. The largest beans in Arabica, nicknamed elephant beans. Smooth, sweet, and gentle.
Blue Mountain. A Typica selection from Jamaica. Mild, sweet, and balanced. One of the most expensive coffees in the world.
Kent. A Typica derivative from India with partial rust resistance.
Pache. A compact Typica mutation from Guatemala.

Typica also crossed with Bourbon to create Mundo Novo, a natural hybrid discovered in Brazil. Mundo Novo combined Bourbon’s sweetness with Typica’s vigour and became the parent of Catuai (Mundo Novo x Caturra), one of the most widely planted varieties in the world.

Furthermore, Maragogype crossed with Pacas (a Bourbon mutation) to create Pacamara, one of the most successful competition varieties in Central America.

The Bourbon Branch

Bourbon diversified even more extensively than Typica:

Natural mutations:

Caturra. A dwarf mutation from Brazil. Compact, high-yielding, bright acidity, clean sweetness. One of the most widely planted specialty varieties in Latin America.
Pacas. A compact mutation from El Salvador. Sweetness and wind resistance. Parent of Pacamara.
SL28 and SL34. Kenyan selections from Bourbon-related material. SL28 produces blackcurrant, grapefruit, and sparkling acidity. Among the most distinctive and intense flavour profiles in all of coffee.
Yellow and Orange Bourbon. Colour mutations producing yellow or orange cherries with slightly sweeter, more citrus-forward profiles.

The Pink Bourbon mystery:

Pink Bourbon. Originally assumed to be a colour mutation of Red Bourbon. Genetic analysis suggests it may be a Bourbon-Ethiopian Heirloom hybrid. Passion fruit, florals, honey, and a flavour profile dramatically different from other Bourbons. One of the most sought-after varieties in Colombian specialty coffee.

Caturra’s descendants:

Catuai. Caturra crossed with Mundo Novo. Compact, productive, chocolatey. Dominates production in Brazil and Central America.
Maracaturra. Caturra crossed with Maragogype. Large beans, tropical fruit, bright acidity.

The Disease-Resistant Bridge

One of the most consequential events in the modern coffee family tree was the Timor Hybrid: a natural cross between Arabica and Robusta that occurred on the island of Timor. This rare interspecies hybridisation transferred Robusta’s coffee leaf rust resistance into an Arabica-compatible plant. Breeders then crossed the Timor Hybrid with Arabica varieties to create disease-resistant offspring:

Castillo. Caturra x Timor Hybrid, developed by Colombia’s Cenicafé. Initially controversial for cup quality, now producing exceptional coffees through innovative processing.
Catimor. Caturra x Timor Hybrid, developed by multiple programmes worldwide. Strong rust resistance but often criticised for cup quality.
Sarchimor. Villa Sarchi (a Bourbon mutation from Costa Rica) x Timor Hybrid. Better cup quality than most Catimors.
Colombia (variety). Another Caturra x Timor Hybrid cross, widely planted across Colombia alongside Castillo.

Each of these carries a small proportion of Robusta genetics. The backcrossing programmes diluted the Robusta contribution as much as possible while retaining the rust-resistance genes. For the full story of how these varieties were developed, read our guide on how coffee varieties are created.

The Ethiopian Landraces

While Typica and Bourbon were spreading across the world, Ethiopia’s forests continued to harbour thousands of wild Arabica populations that never left the country. These are the Ethiopian landraces, and they represent the deepest genetic diversity in the Arabica species.

Most Ethiopian landraces have never been individually identified or named. The specialty industry groups them under the catch-all label “Ethiopian heirloom.” However, a few have been identified, named, and planted outside Ethiopia:

Gesha. From the Gesha forest in southwestern Ethiopia. Jasmine, bergamot, tropical fruit, and tea-like clarity. The most celebrated and most expensive variety in specialty coffee.
Wush Wush. From the Wush Wush area in the Kaffa zone. Tropical fruit, florals, and bright acidity. Increasingly planted in Colombia.

These rediscoveries hint at what remains undiscovered. Ethiopia’s forests may contain hundreds of varieties with exceptional cup quality, disease resistance, or climate tolerance that the world has never tasted.

The New Wave

A group of varieties has emerged in recent years that do not fit neatly into the Typica or Bourbon lineages. Their genetics are debated, their origins are sometimes unclear, and their cup quality is exceptional:

Sidra. Originally from Ecuador, now thriving in Colombia. Possibly a Bourbon-Typica hybrid, possibly carrying Ethiopian landrace genetics. Tropical fruit, florals, and a wine-like body.
Chiroso. Rediscovered in Urrao, Antioquia, Colombia. Possibly an Ethiopian landrace, possibly Typica-related. Citrus, white florals, and sparkling acidity.
Pink Bourbon. Assumed to be a Bourbon colour mutation until genetic analysis suggested Bourbon-Ethiopian Heirloom hybrid ancestry. Passion fruit, florals, and honey.

These varieties challenge the assumption that the coffee family tree is fully mapped. New branches are still being discovered, and the genetic identity of existing ones is still being debated. The tree is alive and growing.

Species, Variety, and Bean Morphology

Understanding the family tree requires understanding the levels of classification:

Genus. Coffea. Contains 120 to 130 species.
Species. A biological classification. Arabica, Robusta, Liberica, and Eugenioides are separate species.
Variety. A distinct population within a species with consistent, heritable characteristics. Typica, Bourbon, Caturra, Gesha, and SL28 are all varieties of Arabica.
Bean morphology. A physical characteristic that can occur in any variety. Peaberry (a single round seed instead of two flat-faced seeds) is a bean morphology, not a variety.

Processing method (washed, natural, anaerobic) and roast level (light, medium, dark) are not part of the family tree. They shape flavour but do not change genetics. For how processing interacts with variety, read our complete guide to coffee processing methods.

How Varieties Are Created

Every variety on the family tree arrived through one of three mechanisms:

Natural mutation. A spontaneous change in a single plant’s DNA. One parent, one change from within. Examples: Caturra (dwarf mutation of Bourbon), Maragogype (giant-bean mutation of Typica).
Natural hybridisation. Two plants cross-pollinate in the wild. Two parents, combined genetics. Examples: Mundo Novo (Bourbon x Typica), Timor Hybrid (Arabica x Robusta), and Arabica itself (Canephora x Eugenioides).
Deliberate breeding. Researchers intentionally cross two parents. Examples: Catuai (Mundo Novo x Caturra), Castillo (Caturra x Timor Hybrid), Pacamara (Pacas x Maragogype).

A fourth category, rediscovery, covers varieties like Gesha, Wush Wush, Chiroso, and Sidra that were not created but found. For the full explanation, read our guide on how coffee varieties are created.

Why the Family Tree Matters

The coffee family tree matters for three reasons.

First, genetics shape flavour. Understanding which lineage a variety belongs to helps predict what it will taste like. Bourbon descendants tend toward sweetness, body, and red fruit. Typica descendants tend toward clean acidity and delicacy. Ethiopian landraces tend toward florals and aromatic complexity. The family tree is a flavour map. For how variety interacts with origin and processing to shape your cup, read our pillar guide on why coffee tastes the way it does.

Second, the narrow genetic base is a crisis. Most commercially grown Arabica descends from a tiny number of plants that left Ethiopia centuries ago. This narrow base means most varieties share the same vulnerabilities, particularly to coffee leaf rust and climate change. Research suggests suitable Arabica growing area could decline by 50 percent by 2050. The solution sits in Ethiopia’s forests, where thousands of unidentified varieties carry genetic diversity that breeders urgently need.

Third, the tree is still growing. New varieties are being discovered, reclassified, and created. Sidra, Chiroso, and Pink Bourbon emerged in the last decade. Ethiopian forest varieties continue to be identified. Breeding programmes continue to cross existing material. The family tree published today will have new branches tomorrow. Understanding the tree means understanding that coffee’s genetic story is ongoing, not complete.

The Coffee Family Tree at Routes

At Routes, genetics matter. Every coffee we sell is traceable to its variety, origin, altitude, and processing method. Our lineup regularly features coffees from across the family tree:

Bourbon branch: Pink Bourbon, Red Bourbon, Caturra, Castillo
Typica branch: Typica
Ethiopian landraces: Gesha, Heirloom
Kenyan selections: SL28, Batian

A Routes Coffee subscription starting from £9 with free UK delivery is the best way to taste how genetics, origin, and processing interact across the family tree. For guidance on choosing between varieties, read our guide on how to choose specialty coffee.

Frequently Asked Questions

How many species of coffee are there?

The genus Coffea contains 120 to 130 recognised species. However, only two have significant commercial importance: Arabica (approximately 60 percent of global production) and Robusta/Canephora (approximately 40 percent). Liberica accounts for less than 2 percent. Eugenioides has negligible commercial production but is one of Arabica’s parent species. The remaining 120+ species are wild.

How is Arabica related to Robusta?

Arabica is the offspring of Robusta. Tens of thousands of years ago, Coffea canephora (Robusta) crossed with Coffea eugenioides in the Ethiopian highlands, and the offspring became Coffea arabica. This means every cup of Arabica carries genetic material from both Robusta and Eugenioides.

What are the main Arabica variety lineages?

Arabica diversified into two main lineages after leaving Ethiopia. The Typica lineage travelled through Yemen, India, and Indonesia to the Americas. The Bourbon lineage travelled through Réunion Island to East Africa and the Americas. Most commercially grown Arabica varieties descend from one or both of these lineages through mutation, natural hybridisation, or deliberate breeding.

What is the difference between a coffee species and a variety?

A species is a biological classification. Arabica, Robusta, Liberica, and Eugenioides are separate species. A variety is a distinct population within a species with consistent, heritable characteristics. Typica, Bourbon, Caturra, Gesha, and SL28 are all varieties within the Arabica species.

How are new coffee varieties created?

Through three mechanisms. Natural mutation changes a single plant’s DNA from within (for example, Caturra is a dwarf mutation of Bourbon). Natural hybridisation combines genetics from two plants that cross-pollinate in the wild (for example, Mundo Novo is a natural Bourbon-Typica cross). Deliberate breeding intentionally crosses selected parents (for example, Catuai is a deliberate cross of Mundo Novo and Caturra). For the full explanation, read our guide on how coffee varieties are created.

Why does the coffee family tree matter?

The family tree matters because genetics shape flavour. Understanding which lineage a variety belongs to helps predict what it will taste like. Furthermore, the narrow genetic base of commercial Arabica makes the crop vulnerable to disease and climate change. Genetic diversity, particularly from Ethiopian wild forests, is essential for coffee’s long-term survival.