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[4] [5] This pod, like all legumes, is a single carpel, the largest carpel of any known plant. Inside the pods are ten to fifteen seeds, each of which have a diameter of 6 cm (2.4 in) and a thickness of 2 cm (0.79 in). [6] The seeds contain a hollow cavity, which gives them buoyancy.
Seagrasses evolved from terrestrial plants which recolonised the ocean 70 to 100 million years ago. The name seagrass stems from the many species with long and narrow leaves , which grow by rhizome extension and often spread across large " meadows " resembling grassland ; many species superficially resemble terrestrial grasses of the family ...
It cannot grow in fresh water but some growth is possible at a salinity of 10 parts per thousand. The plant's preferred salinity range is 25 to 38.5 parts per thousand with a temperature range of 20 to 30 °C (68 to 86 °F). It is found from the low-tide mark down to depths of 30 metres (98 ft), depending on water clarity.
An alternative offset would be to cultivate kelp forests. Kelp can grow at 2 feet per day, 30 times faster than terrestrial plants. Planting kelp across 10% of the oceans (4.5 x the area of Australia) could provide the same offset. Additionally, the kelp would support a fish harvest of 2 megatons per year and reduce ocean acidification. Large ...
The organisms require nutrient-rich water with temperatures between 6 and 14 °C (43 and 57 °F). They are known for their high growth rate—the genera Macrocystis and Nereocystis can grow as fast as half a metre a day (that is, about 20 inches a day), ultimately reaching 30 to 80 metres (100 to 260 ft). [7]
Most are produced by tropical trees, and they can be found on distant beaches after drifting thousands of miles through ocean currents. This method of propagation has helped many species of plant such as the coconut colonize and establish themselves on previously barren islands. Consequently, drift seeds and fruits are of interest to scientists ...
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Holodiscus discolor is a fast-growing deciduous shrub usually from to 1.2–1.5 metres (4–5 feet) in width, and up to 2.1 m (7 ft) tall. Its alternate leaves are small, 5–9 centimetres (2– 3 + 1 ⁄ 2 inches) long and 4–7 cm (1 + 1 ⁄ 2 –3 in) broad, lobed, juicy green when new. [6]