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Agathis macrophylla known as Pacific kauri, is a coniferous tree native to the islands of the southwestern Pacific Ocean in tropical humid lowlands and lower montane regions, notably in Fiji, Vanuatu, and the Santa Cruz Islands. The Pacific kauri is one of the largest and fastest growing species in its genus, and is important in forestry. [3]
Fresh seeds germinate in 3 to 20 days and require no special treatment. [14] Plants grow best in acid, well-aerated soils of pH 5.5 to 6.3, with low levels of phosphorus. They are sensitive to iron deficiency, which presents as yellowing of the youngest leaves while the leaf veins remain green. [41]
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 Poaceae.
Marine botany is the study of flowering vascular plant species and marine algae that live in shallow seawater of the open ocean and the littoral zone, along shorelines of the intertidal zone, coastal wetlands, and low-salinity brackish water of estuaries. It is a branch of marine biology and botany.
The salinity levels in brackish marshes can range from 0.5 ppt to 35 ppt. [2] Marshes are also characterised by low-growing vegetation and bare mud or sand flats. [3] Due to the variations in salinity, brackish marshes create a distinctive ecosystem where plants from either freshwater or saltwater marshes can co-inhabit. [4]
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]
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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]