Seedless vascular plants include club mosses and ferns. A vascular system allows these plants to grow higher off the ground than the nonvascular plants, and they still rely on free-standing water for reproduction.
Club mosses look like mosses, but they have roots, stems, and leaves. Ferns look like "normal" plants, they have leaves, and can sometimes be quite tall.
Watch this video, Fern Plants and their Life Cycle (seedless, vascular) updated. The alternation of generations is important to know.