All plants are eukaryotic and multicellular. There are two different type of plants, Vascular and Nonvascular plants.
Vascular plants are usually really tall because vascular plants have vascular systems that transport water and nutrients throughout the plant allowing them to increase their size. Some examples are the Redwoods in California.
Nonvascular plants however, don't have a vascular system and they need to stay closer to the ground to obtain nutrients and water. This is why they are usually small.
Seedless plants usually make up the nonvascular categories. Instead of growing from seeds, they tend to grow from spores. There are vascular and nonvascular seedless plants. Vascular seedless plants are contain vascular tissue and have roots, stems, and leaves. Nonvascular seedless plants don't have vascular tissue or roots, stems, or leaves though they do have parts that may look like leaves or roots.
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Seed plants however, reproduce by making seeds because they are vascular plants. Also, seed plants can be identified by whether a fruit contains the seeds. There are two types of seed plants, gymnosperms which don't produce fruits, and angiosperms which do.