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The botanical name is the proper or scientific name of a plant. It consists of two parts and is called a binomial (bi equals two, nomial equals name):

 The species name: The species name is kind of like your own first name (except it comes last in a plant’s botanical name).

 The genus name: The genus name is similar to your family name (except in botanical names, it comes first).

For example, in the plant name Hosta undulata, Hosta is the genus name, and undulata is the species name. Hosta describes an entire genus of popular, mostly shade-loving plants named hostas, and undulata describes the type of hosta it is — a hosta with an undulating leaf shape.

The singular and plural for the word species is species.

Sometimes the botanical name has a third name, right after the species name, known as the botanical variety. A botanical variety is a member of the same plant species but looks different enough to warrant its own name, such as Rosa gallica var. officinalis.

Still another botanical name that sometimes comes up is the cultivar, short for cultivated variety. Cultivars are usually named by the people who developed or discovered them, and they’re often maintained through asexual or vegetative propagation for example by cuttings, seed propagation, or the most-modern method of raising large numbers of identical plants in test tubes, called tissue culture. In other words, they’re cultivated (humans grow, improve, and develop them). An example is Lychnis coronaria ‘Angel’s Blush.’ You can use or modify some of these techniques to make more plants yourself. For more details about how to, see Chapter 10.

A hybrid plant is the result of the cross-pollination between two genetically different plants, usually of the same species but different varieties. This combination can happen with human intervention, when the object is to make a new or improved plant or it can occur naturally through bee pollination between two different plants.

Botanical names are more common with some types of plants than others. For instance, you frequently run into them with herbaceous plants, trees, and shrubs but much less so with roses, annuals, and vegetables. You can find botanical names on the labels and in many garden references.

Even though botanical names can be a bit intimidating and sometimes a pain to remember, they’re much more definitive than common names. They’re recognized internationally so anywhere you are in the world, fellow plant lovers will know what plant you’re talking about.