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Paulownia tomentosa. Paulownia is a genus of angiosperm trees, and one of the fastest-growing trees in the world. [12] Paulownia tomentosa can grow over 30 metres (98 ft) tall and has large heart shaped leaves ranging from 10–20 centimetres (4–8 in) wide and 15–30 centimetres (6–12 in) long with a 10–20 centimetres (4–8 in)-long petiole. [13]
Native ash species, including white ash (pictured), have been declining rapidly this century due to predation by the emerald ash borer. [1] Silvics of North America (1991), [2] [3] a forest inventory compiled and published by the United States Forest Service, includes many hardwood trees.
Pollarded trees do not produce flowers, as these form only on mature wood. Paulownia tomentosa requires full sun for proper growth. [15] [16] It is tolerant of pollution and can tolerate many soil types. It can also grow from small cracks in pavements and walls. Paulownia can survive wildfires because the roots can regenerate new, very fast ...
A deciduous angiosperm, Ochroma pyramidale can grow up to 30 m tall, and is classified as a hardwood despite the wood itself being very soft; it is the softest commercial hardwood and is widely used because of its light weight. Balsa trees grow extremely fast, often up to 27 metres in 10–15 years, and do not usually live beyond 30 to 40 years.
The plant is a flowering evergreen hardwood shrub or small multi-trunked tree, growing from 8–18 feet (2.4–5.5 m) in height and 6–10 feet (1.8–3.0 m) in width. The 1–5 centimetres (0.39–1.97 in) leaves are olive to gray−green, fuzzy and flannel-like, palmately to pinnately lobed.
It is an evergreen tree growing to 30 metres (98 feet) tall with a trunk up to 90 centimetres (35 inches) in diameter. [8] The largest recorded tree is in Mendocino County, California, and measured (as of 1997) 33 m (108 ft) in height with a 36 m (119 ft) spread. [9]
The tree produces spiky green fruits about the size of a golf ball, which turn brown and drop off the tree over an extended period beginning in fall and continuing over the winter.
Of California's total plant population, 2,153 species, subspecies, and varieties are endemic and native to California alone, according to the 1993 Jepson Manual study. [4] This botanical diversity stems not only from the size of the state, but also its diverse topographies , climates, and soils (e.g. serpentine outcrops ).
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