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The pear-shaped fruit is usually 7–20 cm (3–8 in) long, weighs between 100 and 1,000 g (3 + 1 ⁄ 2 and 35 + 1 ⁄ 2 oz), and has a large central seed, 5–6.4 cm (2– 2 + 1 ⁄ 2 in) long. [4] Early wild avocados prior to domestication had much smaller seeds around 2.1–2.2 centimetres (0.83–0.87 in) in diameter, likely corresponding ...
The "pears" of Xylomelum species are thought to have evolved primarily as a defense against seed predation. However, these woody fruits also provide protection of the seeds from fire. Johnson and Briggs (1963) consider the woody seeds in Proteaceae to be a late evolutionary adaptation to fire. [8]
Chadwick Arboretum is a 62 acres (25 ha) arboretum on the Agriculture campus of Ohio State University, in Columbus, Ohio, United States.The main arboretum collection is located just across Lane Avenue from the Schottenstein Center with its other collections nearby.
Persea americana, the avocado, aguacate, palta, butter pear or alligator pear tree; Pilularia americana, the American pillwort, an aquatic fern species; Prunus americana, a species of plum tree; Phytolacca americana
Pyrus calleryana, also known as the Callery pear or Bradford pear, is a species of pear tree native to China and Vietnam, [2] in the family Rosaceae. It is most commonly known for its cultivar 'Bradford' and its offensive odor, widely planted throughout the United States and increasingly regarded as an invasive species .
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Xylomelum pyriforme, commonly known as the woody pear, is a species of plant in the family Proteaceae native to eastern Australia. It grows as a large shrub or small tree to five metres high. It grows as a large shrub or small tree to five metres high.
The tree or shrub typically grows to a height of 2 to 8 metres (6 ft 7 in to 26 ft 3 in) and has epicormic buds. It blooms between December and February producing cream white flowers. [ 4 ] The surface of the flower is finely covered in silky hairs, the colour is a sulphurous yellow, they appear on spikes at the end of its branches.