# Arabica, Canephora, and Variety (/en/docs/foundation/phase-1/chapter-03)
## Phenomenon [#phenomenon]
On a supermarket shelf, a tin of ground coffee says "100% Arabica" in big letters, as if that settled the question of quality. Next to it, the ingredients on a jar of instant coffee list "Robusta".
A specialty café's menu offers "Ethiopia heirloom", "Panama Geisha" and "Colombia Caturra". Another café is promoting a "fine Robusta".
Arabica, Robusta, Geisha, Caturra — are these names the same kind of thing? Does "100% Arabica" really tell you the cup will taste good?
## Variables [#variables]
These names belong to different genetic levels. From broadest to narrowest:
| Level | Examples | What it distinguishes |
| ------------------ | ------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------- |
| Genus | *Coffea* | All coffee plants (Chapter 2) |
| Species | Arabica (*C. arabica*), Canephora (*C. canephora*, commonly "Robusta"), Liberica and others | Whether they interbreed naturally, where they grow, what is in the seed |
| Variety / cultivar | Typica, Bourbon, Caturra, Geisha, SL28; types of Canephora such as Conilon | A kind of plant within one species, selected by people and passed on reliably |
| One plant | A particular tree on a particular plot | Its own genetics, plus what it went through this year |
Beyond genetics, two more sets of variables shape a cup just as much: **environment** (temperature, rain, elevation — Chapter 4) and **human decisions** (farming, harvest, processing — Chapters 5–7).
## Experiment [#experiment]
Thought experiment one: on the same farm, one plot grows Arabica and another grows Canephora. Harvest, processing, roasting and brewing are all done the same way.
How will the two cups differ? Which is more likely to be bitter and heavy-bodied? Which has more caffeine? Do the two plots of trees need the same temperatures?
Thought experiment two: grow one variety in two places with very different climates; then grow two different varieties on the same plot.
Which pair of cups will differ more: same variety in different places, or different varieties in the same place?
## Observation [#observation]
**The two species put different things into their seeds.** Green Canephora usually contains clearly more caffeine and chlorogenic acids than Arabica, while Arabica contains more sucrose and lipids. Caffeine and chlorogenic acids are linked to bitterness and astringency; sugars are an important raw material for the aroma and color made in roasting (Chapter 13). So with everything else equal, the Canephora cup is more likely to be bitter and heavy, and to carry more caffeine.
**The two species like different climates.** Arabica prefers cool conditions; Canephora is better adapted to warm, humid lowlands and copes much worse with low temperatures than Arabica. Even "Canephora tolerates heat" has limits, though — Chapter 4 covers a newer finding.
**Their histories and genetic structure differ too.** Arabica is a tetraploid species formed when Canephora hybridized with another species, *C. eugenioides*; cultivated Arabica has been through several population bottlenecks and has very narrow genetic diversity. Canephora needs pollen from another plant to set fruit (Chapter 2), so each generation is mixed, and its genetic diversity is much greater.
**Both species matter.** Roughly 60% of the world's coffee comes from Arabica and 40% from Canephora. Canephora is in instant coffee and in many blends.
As for the second experiment, the answer is: **either can be large.** Research has found that when one variety is grown on plots with different climates, the mean temperature while the seed develops clearly changes the flavor in the cup; and different varieties really do differ in fruit size, yield, disease resistance and flavor potential. Which one dominates depends on the specific place and the specific varieties.
## Model [#model]
### Genetics sets the range; environment and people pick the point [#genetics-sets-the-range-environment-and-people-pick-the-point]
Think of species and variety as a **range of possibilities**: how tall the plant grows, which diseases it resists, roughly what its seed will store, how good its flavor can get.
Environment and human decisions then pick a **point** inside that range. The same variety grown cool and high and harvested with care, versus grown hot and low and harvested roughly, can turn out very differently. Variety decides how good a coffee could be, not how good it will be.
### Where varieties come from [#where-varieties-come-from]
Historically, most cultivated Arabica descends from two lineages, Typica and Bourbon. From there, varieties arise in a few ways:
* **Natural mutation**: Caturra is a dwarf mutation of Bourbon — a shorter plant that can be planted densely and picked more easily.
* **Landraces**: in Arabica's homeland, Ethiopia, there are many local populations that have never been systematically sorted out; bags often call them "heirloom".
* **Crosses between species**: on the island of Timor, a natural hybrid of Arabica and Canephora was found (the Timor Hybrid); varieties bred from it, such as Catimor, carry resistance to coffee leaf rust inherited from Canephora.
* **Modern breeding**: first-generation (F1) hybrids made from two very different parents, aiming for yield, resistance and quality at once.
### Why genetic differences matter [#why-genetic-differences-matter]
Genetics is not only about flavor. For a farmer, choosing a variety is a set of trade-offs:
* **Disease**: leaf rust can wipe out much of a farm's crop; a resistant variety means less spraying and steadier harvests;
* **Yield and plant shape**: shorter plants can be planted more densely, and higher-yielding ones mean more income;
* **Climate**: as the climate warms, tolerance of heat and drought matters more and more (Chapter 4);
* **Flavor potential**: some varieties, in the right place, can produce exceptional cups.
Arabica's narrow genetic diversity means breeders have limited raw material, so researchers are also looking at other species. A 2021 study found that a nearly forgotten wild species, *C. stenophylla*, grows and crops at mean annual temperatures about 6 °C higher than Arabica, while a tasting panel judged its flavor similar to Arabica's. That is one study with a modest tasting panel, but it shows that "good flavor belongs only to Arabica" is not a law of nature.
### Names and genetics do not always match [#names-and-genetics-do-not-always-match]
"Robusta" was originally the name of one type of Canephora, and the trade later used it for the whole species; in Brazil, another group of Canephora is called Conilon. Variety names work the same way: plants sold under one name on different farms may not be genetically the same, and the same plant may go by different names in different places.
## Transfer [#transfer]
Use the model to read a coffee bag:
| On the bag | What it tells you | What it cannot promise |
| ---------------------------- | ------------------------------------------------------ | ------------------------------------------------------------------- |
| 100% Arabica | The species | Quality — there is plenty of mediocre commercial Arabica |
| Robusta / contains Canephora | The species — usually more caffeine and a heavier body | "Bad" — well-grown, well-processed Canephora can be clean |
| Geisha, Bourbon, SL28 | The variety, i.e. the plant's genetics | A flavor — that depends on where and how it was grown and processed |
| Heirloom / landrace | From genetically diverse local populations | Exactly which plants, which is often unknown |
Some espresso blends deliberately include some Canephora for more body, more crema and stronger bitterness. That is a style choice, not shorthand for cutting corners.
## Misconceptions [#misconceptions]
**"Arabica is good and Robusta is bad."** Species sets a range of possibilities and a rough style, not a quality grade. Plenty of Arabica is mediocre commercial coffee, and the trade also has ways of grading high-quality Robusta. Part of Canephora's poor reputation comes from its long use as a cheap raw material, with little care put into harvest and processing.
**"Robusta is a variety of Arabica."** They are two different species. If anything, Arabica descends from a cross between Canephora and another species, so Canephora is one of Arabica's "parents".
**"A variety name guarantees the flavor — Geisha is always floral."** Variety only gives possibilities. The same variety grown carefully at a cool, high elevation and grown roughly in a hot lowland can taste completely different, and processing and roasting change it further (Chapters 5 and 7).
**"Variety and species are the same thing; Bourbon and Typica are separate species."** Bourbon, Typica, Caturra and Geisha are all varieties within the single species Arabica. The differences between species are much larger: caffeine, climate needs and pollination all differ.
## Real Lab [#real-lab]
There is no registered lab card for this chapter, but you can taste the difference between species at home.
1. Buy two small bags: one Arabica, one Robusta (Vietnamese coffee shops, some roasters and online shops sell it). Try to choose two with a similar roast level, and note it — a different roast level would mix with the species difference (Chapter 15).
2. Brew both exactly the same way: same dose, grind, water amount, temperature and time. Without a scale, use the same spoon and the same cup.
3. Ask a friend to shuffle the two cups and mark the bottoms, and taste without looking.
4. For each cup, write down: how bitter, how heavy, how sweet, how noticeable the acidity, and what lingers after you swallow.
5. Reveal the answer. Do your notes match the Observation section? Where they do not, what might explain it?
## Check Your Model [#check-your-model]
**Predict.** A farmer at 1,800 m, on a mountain with cold nights, wants to switch to Canephora because they heard it is high-yielding and disease resistant. What do you expect to happen?
Canephora is adapted to warm lowlands and copes much worse with low temperatures than Arabica, so on a cool mountain it will probably grow poorly and yield disappointingly. A species' genetics sets the climate it suits; "high-yielding" only holds in the right environment. Here, switching to a disease-resistant Arabica variety would probably make more sense.
**Diagnose.** A friend takes a sip and says: "This is so bitter, it must be Robusta." Apart from species, what could make a cup very bitter?
Species is only one possibility. A dark roast brings more roasty bitterness (Chapters 15 and 16); over-extraction — grinding too fine, steeping too long, water too hot — also makes a cup more bitter (Chapter 23); and a very strong ratio makes every taste heavier. To tell whether species is the cause, you first have to hold the other variables steady, as in the Real Lab.
**Explain.** In your own words, explain why a farmer might plant Catimor instead of the more famous Typica.
Choosing a variety is not only about flavor. Catimor carries leaf-rust resistance inherited from Canephora, and it is a shorter plant that suits dense planting — so fewer losses to disease and a steadier yield and income. Typica's flavor potential may be more admired, but where leaf rust is severe, its harvest is a bigger gamble. Genetic differences matter precisely because they affect flavor, yield and risk all at once.