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It contains nine species of marine plants [3] ("seagrass"), found in the seas of the Mediterranean and around the south coast of Australia. The APG system (1998) and APG II system (2003) accept this genus as constituting the sole genus in the family Posidoniaceae , which it places in the order Alismatales , in the clade monocots .
Monocots are grass and grass-like flowering plants (angiosperms), the seeds of which typically contain only one embryonic leaf or cotyledon. [12] Terrestrial plants evolved perhaps as early as 450 million years ago from a group of green algae. [13] Seagrasses then evolved from terrestrial plants which migrated back into the ocean.
Phyllospadix scouleri, or Scouler's surfgrass, is a flowering marine plant in the family Zosteraceae. It is native to the coastline of western North America from the Alaskan panhandle to Baja California. This slender, vivid green plant has long, flat blades. It grows in large clumps or beds exposed during low tide and submerged at high tide.
Cymodoceaceae is a family of flowering plants, sometimes known as the "manatee-grass family", which includes only marine species. [2]The 2016 APG IV does recognize Cymodoceaceae and places it in the order Alismatales, in the clade monocots.
Halodule wrightii is an aquatic plant in the Cymodoceaceae family. [3] It is referred to by the common names shoal grass or shoalweed, and is a plant species native to seacoasts of some of the warmer oceans of the world. H. wrightii is an herb growing in salt-water marshes in intertidal regions, often submerged at high tide but emergent at low ...
Zostera marina is a flowering vascular plant species as one of many kinds of seagrass, with this species known primarily by the English name of eelgrass with seawrack much less used, and refers to the plant after breaking loose from the submerged wetland soil, and drifting free with ocean current and waves to a coast seashore.
ReefGen first engineered a robot named Cora that plants coral plugs onto reefs to help regenerate them. Cora provided the foundation for Grasshopper – the startup’s seagrass planting iteration.
Nitrogen and phosphorus can be acquired from sediment pore water or from the water column, and sea grasses can uptake N in both ammonium (NH 4+) and nitrate (NO 3−) form. [ 66 ] A number of studies from around the world have found that there is a wide range in the concentrations of C, N, and P in seagrasses depending on their species and ...