Once you begin to discover succulent plants to grow in your home or your garden, it is time to leap into the pool of plant taxonomy (the naming of plants). The purpose of plant names is to organize the world of plants. Most succulents have two types of names: common and scientific.
Common Names
Among succulent enthusiasts, common names are more often used instead of scientific names because common names are more natural and easier to remember. However, you may sometimes find a newly cultivated or discovered succulent without a common name, some different succulents with the same common name, or one succulent with multiple common names. In such cases, it is helpful to know and understand at least the scientific names.
Scientific Names
The genus name and species epithet comprise the scientific name that every succulent is given when first described by a scientist. These species names are recognized by botanists, horticulturists, and gardeners, no matter where you go in the world. A botanical name consists of two words and is called a binomial name. The first word, its first letter should always be capitalized, of the name identifies the genus of the plant, and the second word identifies the species within the genus (not capitalized). The full name should be italicized.
Example: Echeveria agavoides.
The genus name can be used alone when discussing a group of succulents, but the specific epithet is never used alone. Once the genus has been used in a paragraph or is understood, it can be abbreviated, such as "C. ovata." An unspecified (or unknown) species in the genus Crassula would be written as "Crassula sp." To denote more than one species in the genus, it is written "Crassula spp.," with two p's.
In more publications, there may also be a person's name after the genus and species, the person who described the plant. If another scientist later decides that the plant belongs to another genus, the original author's name is placed in parentheses, followed by the person who changed the classification.
Example: Crassula ovata (Miller) Druce.
The trinomial name of a succulent is similar to the binomial name but more specific on the rank of species, namely subspecies, variety, and cultivar.
A subspecies is a geographically separate population within a species that is almost, but not quite, a separate species. The subspecies name is not capitalized and is preceded by the abbreviation "subsp." or "ssp." The abbreviation is not italicized (although the subspecies name should be).
Example: Sempervivum arachnoideum subsp. tomentosum.
Varieties often occur in nature, and most are true to type (seedlings grown from a variety will also have the same unique characteristics as the parent plant). The variety name is not capitalized and is preceded by the abbreviations "var." or "v." The abbreviation is not italicized (although the variety name should be).
Example: Crassula perfoliata var. minor.
Cultivar means "cultivated variety" and may not be true to type. They are selected and cultivated by humans. The first letter of a cultivar is capitalized, and the term is never italicized. It is preceded by the abbreviation "cv." or placed in single quotation marks. The abbreviation is not italicized.
Example: Echeveria agavoides cv. Romeo or Echeveria agavoides 'Romeo'.
Sometimes, plants have more than three parts in their scientific names. Succulents usually have three different forms: variegated, crested, and monstrose.
Variegation is the appearance of different colored zones in the leaves or stems of the plant. Variegated succulents have their names followed by "f. variegatus/variegata/variegatum" or "forma variegatus/variegata/variegatum." The abbreviation "f." and the word "forma" are not italicized (although the word "variegatus/variegata/variegatum" should be).
Example: Lenophyllum guttatum f. variegatum or Lenophyllum guttatum forma variegatum.
The crested or cristate form is a rare mutation in which a plant produces elongated or flattened tissue. The binomial name is followed by "f. cristatus/cristata/cristatum" or "forma cristatus/cristata/cristatum". The abbreviation "f." and the word "forma" are not italicized (although the word "cristatus/cristata/cristatum" should be).
Example: Carnegiea gigantea f. cristata or Carnegiea gigantea forma cristata.
A monstrous mutation is even more distorted than a crested one. It usually involves all the meristematic tissue in a plant and results in a club- or cylindrical-like shape or sometimes an uneven surface. This is more common in cacti. The binomial name is followed by "f. monstruosus/monstruosa/monstruosum" or "forma monstruosus/monstruosa/monstruosum." The abbreviation "f." and the word "forma" are not italicized (although the word "monstruosus/monstruosa/monstruosum" should be).
Example: Pachycereus schottii f. monstrosus or Pachycereus schottii forma monstrosus.
Hybridization is the breeding of plants to create new varieties and improve old ones. It's especially popular with Echeverias. The parent flower that furnishes the pollen is called the pollen parent, and the one that bears the seed is called the seed parent. The seed parent always comes first, the pollen parent comes second, and the symbol "×" is between them and is not italicized.
Example: Echeveria shaviana × Echeveria affinis = Echeveria' Black Prince'.
Name Changes
As taxonomists study plants, they sometimes conclude that a plant is misnamed and belongs to a different genus or species. An example is Lace Aloe (Aristaloe aristata). Now listed as part of the Aristaloe genus, it was previously, and still is, in some cases, known as Aloe aristata. If you see two names listed for a succulent in a catalog or on a website and plan to look for the plant at a local garden center, record both names. Sometimes, grower nurseries have a stock of plant tags on hand and will use what they have, which might list an older name.
Common Confusion
While it is quite appropriate to use common names when everyone knows what you mean, often, it is much better to use the proper scientific name. By their very nature, common names are only given to common succulents. But common where? Succulents common in one place are not common in another. Also, many succulents have more than one common name.
Some common names refer to several different species. Finally, some succulents, especially the rare ones, do not have common names. Therefore, common names are not as reliable as botanical names for identification purposes.
Source: mzgardens.com
Links
- Succupedia: Browse succulents by Scientific Name, Common Name, Genus, Family, USDA Hardiness Zone, Origin, or cacti by Genus