Final answer:
Primula x polyanthus cv. refers to a cultivated variety of the polyanthus species known as primroses.
Step-by-step explanation:
The subject of the question is Primula x polyanthus cv. In botany, Primula refers to the genus of plants commonly known as primroses. Polyanthus is a specific species within the Primula genus. So, Primula x polyanthus cv. refers to a cultivated variety of the polyanthus species, commonly known as primroses.