This beginner’s guide to botanical names shares the basics for gardeners wanting to get comfortable using the scientific names for plants. Once you understand the conventions for how the names are formed and written, you will also know a lot more about the plants.
We also have a gardener’s dictionary to help understand garden lingo and popular terms.
Scientific Names For Plants
A Quick History of Our Current Plant Naming System
To understand how plants are named and how we arrived at our current system, let’s first look at a brief history of plant names.
While plant names are not complicated, once you know the rules for writing plant names, you can know a lot more about a plant both by the words used and the way the name is written.
In the 1700s, Swedish botanist Carl Linnaeus developed the binomial (two names) system for naming plants. Animal names are formed this way too.
Each botanical or scientific name has two parts: the genus and the specific epithet. The first word is the genus and then, to get a species name, a second word is added — the epithet — an adjective in Latin form. This second word may be a new creation and not actually a word from Latin. Sometimes the epithet is a Latinized version of a place or a person’s name.
Example of Botanical Name
- Common names: foxglove, common foxglove, purple foxglove, lady’s glove
- Digitalis is the genus.
- purpurea is the specific epithet.
- Digitalis purpurea or D. purpurea (can be written either way) is the scientific/botanical name for the species.
- Etymology: purpurea is Latin for purple. You’ll see it used as the specific epithet for many purple plants.
When Linnaeus introduced this system, Latin was the international language of science so that’s what he used for scientific plant names. And it’s what we still use today.
The adoption of the binomial system was a major milestone, bringing some order to the chaos, but it took many more years before a shared, consistent system was adopted across the globe.
And from there, it wasn’t until the advent of genetic testing that we could further verify our classifications through DNA, which continues today.
Does your garden have a name? Try our Garden Name Generator
The International Code of Nomenclature for Plants
Today, the International Botanical Congress (IBC) oversees the International Code of Nomenclature (ICN) for plants, algae, fungi, and plant fossils.
Within this, plant cultivars altered or selected by humans are governed by the International Code of Nomenclature for Cultivated Plants (ICNCP).
Animals, bacteria, and viruses have their own separate Codes.
The goal is to have one correct name for each plant and avoid the mayhem caused by inconsistent or vernacular names.
Common Names versus Botanical Names
While botanical names are standard in the science world, anarchy continues in the gardening world where we use a quirky mixture of botanical and common names (with countless regional variances).
To further spice it up, some plant breeders forgo established names in favor of more alluring, marketable names. Perhaps a rose by any other name does sell better!
Reclassifying Plant Names
The ICN rules are revisited every six years and the next meeting takes place in 2023.
Plants, however, can be reclassified at any time based on the best evidence we have. And when they are, their scientific names can change. We are truly in the early days of genetic analysis and, as the technology improves, we will be able to refine and add classifications more proficiently.
If you follow botanical science news, particularly in a year when the IBC meets, you know there are always new developments, disagreements, and findings.
Keep reading to see practical examples of different plant names.
How to Write Botanical Names / Scientific Names
Plant names are written in a particular format. Unfortunately, they are not always written in the proper format on plant tags, but these are the rules.
The genus is capitalized, the specific epithet is not, and both words are italicized or underlined.
When the entire scientific name is used, the genus name may appear in full or abbreviated with the first letter in upper case.
Scientific Name / Botanical Name Example
Two ways of writing the same name:
- Echinacea purpurea
- E. purpurea
Straight species: Echinacea purpurea
- Variety: Echinacea purpurea var. arkansana
- Cultivar: Echinacea purpurea cv. ‘Magnus’
- Hybrid: Echinacea x hybrida
The world of plants (and life on Earth) is filled with different varieties, both occurring naturally from cross-pollination, mutation, or assisted by humans including hybridization.
Along with the genus and species epithet, you may also have subspecies, variety, cultivar, and form identifiers.
Once new traits become stable and continuously reappear in offspring, the new plant group may be assigned a variety name along with the genus and specific epithet to further define it.
- Naturally occurring variations are denoted with the abbreviation var. which is placed after the specific epithet and is not underlined or italicized.
- The variety name is placed after var. and written in italics.
- If it is a proper noun (only), it is capitalized.
- Quotes are not used.
Two ways of writing the same name:
- Echinacea purpurea var. arkansana
- E. purpurea var. arkansana
This next format notes that the variety is unknown:
- Echinacea purpurea var. unknown
The word cultivar means a cultivated plant variety formed with human influence.
You don’t often see it these days, but the abbreviation cv. can be used to signify that the plant is a cultivar.
- The cv. abbreviation is not underlined or italicized.
- The cultivar name is written after cv. or within single quotes (commonly used) with the first letter capitalized.
- Unlike variety names, cultivar names are not underlined or italicized.
Three 3 ways of writing the same name:
- Echinacea purpurea cv. ‘Magnus’
- E. purpurea cv. ‘Magnus’
- E. purpurea ‘Magnus’
An “x” in the scientific name indicates that the plant is a hybrid.
Echinacea x hybrida
The previous example, Echinacea purpurea cv. ‘Magnus’ or E. purpurea ‘Magnus’, is a hybrid too, of course.
Carl Linnaeus – Swedish Botanist (1707-1778)
The designation L. after a species name indicates Linnaeus first described the entity. Called it!
Frequently Asked Questions
Scientific or botanical plant names are comprised of two words. The first word, the plant genus, is always capitalized. The second word, called the specific epithet, is not capitalized. Together, both words form the plant species name and are italicized or underlined. An example is Digitalis purpurea. When the entire scientific name is used, the genus name may appear in full (Digitalis purpurea) or abbreviated with the first letter in upper case (D. purpurea). Along with straight species, there are standard formats to indicate whether a plant is a variety, cultivar, or hybrid.
Yes, the proper way to write the scientific or botanical name for plants is to put both words in italics or underline them. Although this is the standard, you often see these names written without italics or underlining.
Once you start understanding the meaning or etymology of the genus and species words, it becomes much easier to remember the proper scientific names and get a glimpse into their history and relationships.
Because a lot of common names for plants vary regionally, there can be a lot of misunderstandings about plants, particularly online in plant discussion forums.
At this point it’s a pipedream, but we could communicate much more effectively—and have a better understanding of the plant world—if the scientific names were used more routinely in garden sites, books, seed packets, and plant tags.
If the world of plant names interests you, you might enjoy a course or book on botanical Latin.
- International Botanical Congress | Wikipedia
- International Association for Plant Taxonomy (IAPT)
- International Code of Botanical Nomenclature (ICBN)
- Best (Cheap & Easy) Plant Tags & Markers for Seedlings
- How To Make Long-Lasting Outdoor Plant Markers
- 25 Creative DIY Plant Tags & Markers
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