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The system that involves the use of two names for identifying plants is known as the binomial nomenclature. This system was developed by Carl Linnaeus and is the standard method for naming organisms in the biological sciences. In this system, the first name identifies the genus to which the plant belongs, while the second name specifies the species within that genus.

Binomial nomenclature is important because it provides a universal naming convention that helps avoid confusion caused by common names, which can vary widely by region and language. By using this two-part naming structure, scientists and horticulturists can have a precise and consistent way to communicate about different plant species, ensuring clarity in research, conservation, and cultivation efforts.

The other naming systems mentioned, such as trinomial and monomial, do not accurately describe the method of using two names; trinomial involves a third name for subspecies identification, and monomial refers to a single name, which does not capture the full classification necessary for plant identification. Bipedal is unrelated to nomenclature, as it refers to a mode of locomotion.