Varietals: Typica, Bourbon, Gesha and beyond

Almost every cup of specialty coffee you have ever had came from a single species, Coffea arabica, and almost every Arabica on earth traces back to just two foundational lineages. If you can hold those two in your head, the rest of the family tree falls into place. A note on words first: a varietal strictly means the wine made from a cultivar, but in coffee the trade uses “varietal”, “variety”, and “cultivar” loosely and interchangeably for the named subtypes below. Do not let the vocabulary slow you down.

The two great lineages: Typica and Bourbon

Arabica is naturally inbreeding and has a famously narrow gene pool. The cultivated material that spread around the world descends largely from a tiny number of plants moved out of Yemen (themselves descended from material in Ethiopia, the species’ birthplace, where wild diversity is enormous).

Typica is the older of the two named branches. It traveled from Yemen to India, then to Java, then via Amsterdam to the Caribbean and the Americas. It is tall, with a single main stem and bronze-tipped new leaves, gives relatively low yields, and is vulnerable to most diseases. Its reward is the cup: clean, sweet, refined, often with a delicate florality. Jamaica Blue Mountain and old Sumatran types sit in this family.

Bourbon is the sibling branch, named for the island then called Bourbon (now Reunion), where French plantings mutated and diverged. Bourbon yields roughly 20 to 30 percent more than Typica, has green-tipped new leaves, and gives a rounder, sweeter, sometimes more complex cup. Crucially, Bourbon is the genetic parent of most of the high-grown Latin American varieties people prize today. If Typica is the elegant elder, Bourbon is the productive workhorse that founded a dynasty.

The Bourbon dynasty: Caturra, Catuai, Pacamara

Most of the famous “Latin American” names are Bourbon mutations or crosses bred for the same recurring goal: keep the cup, fix the yield and the height.

• Caturra is a single-gene dwarf mutation of Bourbon found in Brazil in the early twentieth century. The short stature (a trait called compact internode spacing) lets you plant densely and pick easily, so yields climb. The cup stays bright and clean, which is why Caturra became a backbone variety across Colombia and Central America.
• Mundo Novo is a natural Typica x Bourbon cross from Brazil: vigorous, productive, tall.
• Catuai is the deliberate cross of Caturra x Mundo Novo, combining Caturra’s compactness with Mundo Novo’s vigor. It comes in red-fruited and yellow-fruited selections and is one of the most planted varieties in Brazil and Central America.
• Pacamara is a 1950s El Salvador cross of Pacas (itself a Bourbon dwarf mutation) x Maragogipe (a giant-beaned Typica mutation). The result has unusually large beans and, at its best, a wild, punchy, herbal-to-tropical cup that polarizes cuppers. It is genetically unstable, so reputable producers keep selecting it back toward type.

Knowing this helps you read a label: a Colombian “Bourbon, Caturra, Catuai” blend is really three branches of the same family, all chosen for sweetness and clarity at altitude.

The outliers: SL28, SL34, and Gesha

Two stories sit outside the tidy Bourbon family and explain why some coffees taste like nothing else.

SL28 and SL34

In 1930s Kenya, the Scott Laboratories (hence “SL”) selected individual trees for drought tolerance and quality. SL28 has Bourbon-leaning ancestry; SL34 has Typica-leaning ancestry. Both are tall, deep-rooted, and remarkably long-lived, with some original trees still bearing decades on. Their signature, especially on Kenya’s volcanic soils, is an intense, structured, blackcurrant-to-grapefruit acidity that many drinkers consider the benchmark for brightness. The catch: both are highly susceptible to coffee leaf rust and coffee berry disease, so they demand investment to keep healthy.

Gesha (Geisha)

Gesha (often spelled “Geisha”, though Gesha better reflects its origin near Gesha, Ethiopia) was collected in the 1930s and sat unremarkable in Central American collections for decades. In 2004 the Peterson family’s Hacienda La Esmeralda entered a Boquete-grown Gesha into the Best of Panama and it won by a margin that stunned the industry, fetching record prices then and far higher since. Why the fuss: at high altitude Gesha can show an extraordinary jasmine-and-bergamot florality, a tea-like body, and a clean, almost confected sweetness. Two cautions for the advanced reader: Gesha is genetically diverse (Panamanian Gesha is not the same as much Ethiopian “Gesha”), it is low-yielding and finicky, and grown at low altitude it can taste thin and forgettable. The variety is necessary but not sufficient; altitude and terroir do much of the work.

The pragmatists: Castillo, Catimor, and rust resistance

The varieties above are bred for the cup. A whole other branch is bred for survival. When coffee leaf rust (la roya) and other diseases sweep through a region, an unprotected farm of Caturra or SL28 can be devastated.

The fix has been to cross Arabica with the disease-resistant species Coffea canephora (robusta). The original such hybrid, the Timor Hybrid (a natural Arabica x Robusta found on Timor), is the source of rust resistance in most modern resistant lines. Cross the Timor Hybrid with Caturra and you get Catimor; cross it with Catuai you get related lines. Colombia’s national programs produced the Variedad Colombia and then Castillo, both Catimor-derived, now planted across millions of trees because they shrug off rust and yield well.

The old knock on Catimor-type coffees was a coarse, sometimes vegetal or astringent cup, a hangover from the robusta in the pedigree. That reputation is increasingly outdated: later-generation Castillo selections, well grown and well processed, can score competitively and have helped keep many farms solvent through repeated rust epidemics. As an advanced taster, do not dismiss a coffee for being Castillo; judge the cup in front of you. The honest tradeoff across the whole family is the same one breeders have wrestled with for a century: peak cup quality and disease resistance still tend to pull in opposite directions.

Takeaway

When you see a variety on a coffee bag, ask what it was bred for. Typica and Bourbon and their children (Caturra, Catuai, Pacamara) were selected for sweetness and clarity; SL28, SL34, and Gesha for exceptional, distinctive cups at altitude; Castillo and Catimor for survival. None of that overrides growing conditions or processing, but it tells you the producer’s intent, and it sharpens what you go looking for in the cup.

Next: pair this with terroir-and-altitude to see why the same Gesha tastes like jasmine at 1,800 meters and like nothing much lower down.