Which of the following is the correct botanical nomenclature for a plant with the genus Bellis and the species perennis?

The correct botanical nomenclature for a plant is based on the conventions established by the International Code of Botanical Nomenclature. According to these conventions, the genus name is always capitalized and is followed by the species name, which is always written in lowercase.

In this case, for the plant belonging to the genus Bellis and species perennis, the proper format is "Bellis perennis." This format clearly identifies the genus, which is vital for classification and communication in botany, while also adhering to the standard conventions of capitalization.

This nomenclature helps avoid confusion, as it provides a unique and universally accepted name for the species. The other options do not follow these conventions, either by capitalizing the species name or reversing the order of genus and species, which is not permissible in authoritative botanical naming. Hence, "Bellis perennis" is not only accurate but also crucial for proper identification within the scientific community.