Which vascular plant group features seeds that are not enclosed?

Gymnosperms are a group of vascular plants characterized by their seeds being exposed or not enclosed within an ovary or fruit. This is a distinctive feature that sets them apart from angiosperms, which produce seeds that are enclosed in fruit. Gymnosperms, such as conifers, produce seeds in structures known as cones, where the seeds are directly exposed to the environment after they develop.

In contrast, bryophytes are non-vascular plants like mosses and do not produce seeds at all; they reproduce via spores. Angiosperms, which include flowering plants, are known for having seeds enclosed in fruits and therefore do not fit the criteria of the question. Monocots refer to a group within angiosperms characterized by specific seed and flower structures, and are also not applicable as their seeds are enclosed. Thus, gymnosperms are the correct group that features seeds not enclosed, highlighting their unique reproductive strategy in comparison to other plant groups.