Pinus is the correct answer.

Explanation:
Plants are classified into different groups based on their reproductive structures. The two main groups are flowering plants (angiosperms) and non-flowering plants (gymnosperms).

Flowering plants produce flowers, which contain reproductive structures called ovaries that develop into seeds after fertilization. These seeds are enclosed within a fruit. Most familiar plants, including fruits, vegetables, and ornamental plants, are flowering plants.

On the other hand, gymnosperms do not produce flowers. Instead, they produce seeds that are not enclosed within an ovary or fruit. Gymnosperms have naked seeds, meaning that the seeds are exposed and not protected by any structure.

Pinus, commonly known as pine trees, belongs to the gymnosperm group. They produce cones as their reproductive structures. The male cones produce pollen, while the female cones produce seeds. The seeds of pine trees are not enclosed within a fruit, making them gymnosperms.

Therefore, Pinus is an example of a plant that produces seeds but not flowers.

Summary:
Pinus is a type of plant that belongs to the gymnosperm group. Gymnosperms are non-flowering plants that produce seeds without the presence of flowers or fruits. Therefore, Pinus produces seeds but not flowers.