Bourbon Mayaguez 71 and 139; Jackson

The Bourbon Mayaguez varieties—specifically 71 and 139—and the Jackson cultivar represent the backbone of the coffee industries in Rwanda and Burundi. While they share the broader lineage of the Bourbon and Typica families, their specific presence in East Africa is the result of deliberate colonial-era introductions and subsequent local selection processes that tailored these plants to the region's specific environmental conditions.

The Bourbon Mayaguez lineage traces its journey from Central America to the USDA germplasm collection in Mayaguez, Puerto Rico. From there, these plants were introduced to the Mulungu research station in the Democratic Republic of Congo during the 1930s. By the early 1950s, they were brought into Rwanda, where they were further refined. The specific designations '71' and '139' emerged after researchers selected superior mother trees from the initial population to create more stable, productive lines for local farmers.

Jackson, by contrast, has a distinct origin story rooted in India. It is a Typica-derived cultivar that was selected on an estate in Mysore in the early 20th century, named after the estate owner. It is believed to descend from the original coffee seeds transported from Yemen to India via Dutch and Portuguese trade routes in the 1670s. Like the Bourbon Mayaguez lines, Jackson was introduced to East Africa by Belgian colonists, where it became a foundational genetic component of the regional coffee profile.

In the field, these varieties are characterized as tall-growing plants. Bourbon Mayaguez 139 is noted for its vigor and high productivity, while Bourbon Mayaguez 71 is often cited for its suitability at medium altitudes, though it generally offers more moderate yields. Jackson is similarly recognized for its high vigor and productivity. Despite their quality, these varieties share the common vulnerabilities of the Bourbon and Typica families, including susceptibility to major coffee diseases such as Coffee Leaf Rust and Coffee Berry Disease.

For producers in Rwanda and Burundi, these cultivars are chosen for their proven track record of quality and adaptation. They are not merely historical artifacts but active, working varieties that define the cup profile of the region. Roasters and drinkers often associate these varieties with the bright, fruit-forward, and complex acidity that has become the hallmark of high-quality East African specialty coffee, distinguishing them from the more muted or chocolate-heavy profiles of other regions.

Today, these varieties are rarely marketed by their specific cultivar name on consumer packaging, often appearing simply as 'Bourbon' or under specific lot designations. However, their genetic influence is profound. They represent a critical intersection of global agricultural history and local agricultural development, serving as the primary vehicle through which the unique terroir of the Great Lakes region is expressed in the cup.

Understanding these varieties requires recognizing that they are the result of decades of selection. The transition from the initial introduction of Bourbon and Typica genetics to the established, localized populations of today highlights the importance of regional adaptation. For the specialty coffee industry, these plants remain the standard-bearers for quality in one of the world's most important coffee-producing corridors.