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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.
The easiest way to remember which vascular tissue is which is that 'phloem' and 'food' both start with the same sound. Plants that do not have xylem and phloem are considered nonvascular. These plants are small, simple and less advanced than most plants that you may think of. Mosses, liverworts and hornworts are the three main groups of nonvascular plants.