The small, trumpet-shaped, axillary flowers are produced in pairs, and each flower pair arises from one common calyx which is covered with fine hairs. Each flower has four white petals, one pistil, and four stamens. Partridge Berry is a distylous taxa. The plants have either flowers with long pistils and short stamens (long-styled flowers, called the pin), or have short pistils and long stamens (short-styled flowers, called the thrum). The two style morphs are genetically determined, so the pollen from one morph does not fertilize the other morph, resulting in a form of heteromorphic self-incompatibility.