Phylum anthophyta
The distinctive feature of this group is the flower, a cluster of highly-specialized leaves which participate in reproduction. The Anthophyta, the angiosperms or flowering plants, is the largest and youngest phylum of plants. The stamen, or the male part of the flower, consists of a short stalk topped by an anther, where pollen is produced. The female part, the carpel, is made up of a sticky stigma, which traps pollen grains, a tube leading down to the ovary, and the ovules, which produce eggs.
Sea grass
Seagrasses are flowering plants found in shallow coastal marine waters. Since they evolved from land plants millions of years ago, seagrasses are significantly different than seaweed (algae) in their ecology, morphology, and physiology. They provide food and habitat to numerous marine species, stabilize the ocean bottom, maintain water quality, and help support local economies. The amount of light available to seagrasses is one of the primary determinants of the maximum depth at which these plants can grow, since a lack of light interferes with their ability to produce food.