The term "archegoniate" refers to plants that reproduce via sexual means and have a single-celled female reproductive organ. Synonyms for the word "archegoniate" include Bryophytes, Pteridophytes, and Gymnosperms. Bryophytes refer to non-vascular plants, such as mosses and liverworts. Pteridophytes are vascular plants that reproduce via spores and include ferns and horsetails. Gymnosperms are plants that produce seeds without flowers or fruits, such as pine trees and conifers. These terms are often used interchangeably with archegoniate and are part of the same group of plants that diverged from other plant lineages more than 500 million years ago.