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The plant kingdom consists of four major groups: the nonvascular plants, the seedless vascular plants, the gymnosperms and the angiosperms. The nonvascular plants, such as mosses and liverworts, are one of the simplest groups of the true plants.
1 Nonvascular seedless plants include mosses, liverworts, and hornworts. 2  Vascular seedless plants include clubmosses, ferns, whisk ferns, and horsetails. 3  Nonvascular seedless plants spend most of their life cycle in the gametophyte stage, while vascular seedless plants spend most of their life as a sporophyte.onvascular seedless plants, as their name implies, lack vascular tissue. Of course, they don't have seeds either. As they lack vascular tissue, they also do not have true roots, stems or leaves. Nonvascular plants do often have a âleafyâ appearance though, and can have stem-like and root-like structures.