The phrase “coffee variety” often mixes three different levels: botanical species, cultivated variety and flavour in the cup. Arabica is a species, while robusta is the best-known commercial type of Coffea canephora. Bourbon, Typica, Caturra, SL28 and Gesha are varieties or cultivars, mostly within Coffea arabica. Chocolate, berry or jasmine notes are sensory impressions also shaped by origin, processing, roast and extraction.
Arabica is highly visible in specialty coffee and can offer complex aromatic profiles. Robusta generally contains more caffeine and often contributes greater body and bitterness, particularly in espresso. Liberica and coffee sold as excelsa are much rarer in Switzerland. No celebrated variety name guarantees a better cup.
Species, variety and origin are different #
Coffee beans are the seeds of coffee cherries. The National Coffee Association describes how they are harvested, processed, dried, roasted and ground. No single word on a bag can therefore explain the finished drink.
| Bag information | What it describes | Example |
|---|---|---|
| Species | Botanical level within the genus Coffea | Coffea arabica, Coffea canephora |
| Variety or cultivar | Cultivated lineage within a species | Bourbon, Caturra, SL28, Gesha |
| Origin | Country, region, farm or co-operative | Ethiopia Guji, Colombia Huila |
| Process | Work after harvest | Washed, natural, honey, controlled fermentation |
| Roast | Heat development of the green coffee | Light, medium, dark |
The World Coffee Research varieties catalogue presents arabica and robusta varieties with information on genetics, yield, quality potential and susceptibility to diseases. A home drinker does not need to buy by botany alone. The catalogue mainly shows how different two arabicas can be.
Arabica: broad diversity, not a quality seal #
Coffea arabica accounts for a substantial share of world production and is common in coffee sold with a precise origin. Depending on variety, place and process, it may show more perceptible acidity, sweetness and aromatic complexity than standard robusta.
Frequent descriptions include:
- citrus, red fruit or yellow fruit;
- flowers, black tea or jasmine in some Ethiopian coffees;
- chocolate, nuts, caramel or honey;
- clear acidity that may become sharp when extraction is unsuitable.
“100% arabica” is not a quality seal. Old coffee, an unsuitable roast or poor extraction can create a flat, bitter or dry cup. A suitable arabica can be excellent as filter, French press, modern espresso or in a bean-to-cup machine.
Our arabica vs robusta comparison covers species in more depth. The guide to coffee-producing countries adds regional context.
Robusta: body and caffeine without caricature #
Robusta normally refers to the best-known commercial type of Coffea canephora. It plays a major role in soluble coffee, espresso blends and strong milk drinks.
Common tendencies include:
- more caffeine at a comparable coffee weight;
- greater body and perceived bitterness;
- a more prominent crema in espresso;
- possible woody, cereal, cocoa or roasty notes;
- better tolerance of some growing pressures in many settings.
Robusta is not automatically poor coffee. Industrial lots may be coarse, while carefully sorted and appropriately roasted fine robusta can be very interesting. Transparency about origin, harvest, processing and roast is more informative than the word “intense”.
A Food Chemistry study demonstrates considerable caffeine diversity across the genus Coffea (Campa et al., 2005). Dose, drink size and brewing method still determine what reaches the cup.
Liberica and excelsa: rare names with changing taxonomy #
Liberica and coffees sold as excelsa are uncommon in Switzerland. They are more likely to appear at specialist roasters, in regional blends or as niche lots.
Liberica is often described as woody, floral, fruity or unusual. Its seeds may be larger and differently shaped from arabica beans. Sensory descriptions vary sharply with country, process and roast, so the name invites exploration rather than guaranteeing superior quality.
Excelsa needs a botanical clarification. Older sources placed it within Coffea liberica. Kew’s Plants of the World Online now accepts Coffea dewevrei as a species and lists Coffea excelsa as a synonym. “Excelsa” remains common in trade. Ask for the actual origin, process and brewing advice rather than inferring one fixed profile from the commercial name.
Gesha, Bourbon, Typica and Caturra #
Variety names on specialty coffee can provide useful context when origin and processing are also documented.
| Variety or cultivar | Useful context |
|---|---|
| Typica | Historical arabica family, often associated with fine cups but not always high yields |
| Bourbon | Classic arabica family with potential sweetness and structure |
| Caturra | Bourbon mutation widely grown in Latin America |
| Catuaí | Cross cultivated in several producing countries |
| SL28 and SL34 | Varieties known in Kenya and often associated with lively fruit character |
| Gesha or Geisha | Famous for some floral, complex lots, particularly from Panama |
A good Gesha may suggest jasmine, bergamot or tropical fruit. It can also be very expensive and may not suit everyone. For cappuccino or a simply adjusted automatic machine, a fresh balanced blend can be more satisfying than a delicate microlot.
The World Coffee Research Sensory Lexicon helps interpret aroma language. A strawberry or jasmine note describes sensory resemblance, not fruit or flowers added to the coffee.
Matching beans to a brewing method #
For filter, Chemex, V60 or AeroPress, a light-to-medium arabica with a clear origin and named process is a useful starting point. Bourbon, Caturra, SL28 or Gesha become interesting when you compare nuance directly.
Do not dismiss blends for espresso. Arabica may make an elegant shot, while robusta can add body, crema and presence in milk. The actual blend matters more than a universal percentage.
For a bean-to-cup machine, follow its manual first. Unflavoured, less oily beans are straightforward in many machines; some manufacturers advise against coated, caramelised or very oily beans. Our guide to beans for bean-to-cup machines is more useful here than hunting rare varieties.
Balanced, fuller-bodied coffees with a medium roast are often approachable in a French press. Very light coffee can seem austere if grind or contact time is poorly matched.
Reading a bag without being misled #
Look for several concrete details:
- species or blend composition;
- country, region, farm or co-operative;
- variety when known;
- washed, natural or honey process;
- roast date when provided and a suitable pack size;
- roast profile and recommended method.
The variety name cannot replace those facts. A vaguely described “Gesha” without a specific origin is harder to assess than a well-documented Bourbon or Caturra.
The most reliable test #
Buy two small bags and use the same water, dose and suitable grind. Compare a washed Ethiopian or Colombian arabica with an espresso blend containing robusta, then add a named-variety lot if you are curious.
Record acidity, bitterness, sweetness, body, aroma and personal effect. Famous names provide context, but a controlled comparison remains the best judge.
Sources #
- National Coffee Association: What is coffee?
- World Coffee Research: Coffee Varieties Catalog
- Kew Science: Coffea dewevrei
- World Coffee Research: Sensory Lexicon
- Specialty Coffee Association: Coffee Standards
- Campa et al., 2005: caffeine diversity in Coffea
Conclusion #
Species and variety help explain a coffee’s potential, but they never make a complete buying decision. Origin, harvest, process, roast, pack condition and preparation shape the real cup. Treat botanical names as clues, buy small quantities first and let a repeatable taste comparison make the final decision.