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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.
Nonvascular plants (mosses, hornworts, liverworts) 2. Ferns. These are the most well represented of the seedless plants. Most ferns have fronds, compound leaves divided into several leaflets.As the frond develops it uncoils from a structure called a fiddle head.his plant had vascular tissue and a new type of reproductive structure called the seed. These plants contained these seeds in structures called cones. The leaves of most of the gymnosperms are needle-like structures. These needles contained a thick cuticle and reduced stomata.