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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.
Syringodium filiforme, commonly known as manatee grass, is a species of marine seagrass. It forms meadows in shallow sandy or muddy locations in the Caribbean Sea and the Gulf of Mexico, and is also found in the Bahamas and Bermuda. [1] [2] It occurs to a depth of about 20 m (66 ft), and even deeper where water is very clear. [1]
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 environmental factors. For instance, plants collected from high-nutrient environments had lower C:N and C:P ratios than plants collected from low-nutrient environments.
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.
Chasmanthium latifolium, known as fish-on-a-fishing-pole, northern wood-oats, inland sea oats, northern sea oats, and river oats is a species of grass native to the central and eastern United States, Manitoba, and northeastern Mexico; it grows as far north as Pennsylvania and Michigan, [2] where it is a threatened species. [3]
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.