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Hura crepitans, the sandbox tree, [2] also known as possumwood, monkey no-climb, assacu (from Tupi asaku) and jabillo, [3] is an evergreen tree in the family Euphorbiaceae, native to tropical regions of North and South America including the Amazon rainforest. It is also present in parts of Tanzania, where it is considered an invasive species. [4]
A notable example is the sandbox tree (Hura crepitans), which can fling seeds 100 meters (300 ft) and has been called the "boomer plant" due to the loud sound it generates. Another example is Impatiens, whose explosive dehiscence is triggered by being touched, leading it to be called the "touch-me-not".
The tiny insect larva is attacking black locust trees.
Tree sap is a supercooled liquid in cold temperatures. [12] John Hunter observed, in his Treatise on the Blood, that tree sap within a tree freezes some 17 degrees Fahrenheit below its nominal freezing point. [13] [14]
It is a fast-growing, short-lived tree with opposite, ash-like compound leaves. It is sometimes considered a weedy or invasive species , and has been naturalized throughout much of the world, including South America , Australia , New Zealand , South Africa , much of Europe , and parts of Asia .
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Some fruits have evolved propulsive mechanisms that fling seeds substantial distances – perhaps up to 100 m (330 ft) in the case of the sandbox tree – via explosive dehiscence or other such mechanisms (see impatiens and squirting cucumber). [34]
The first above ground symptom that will be observed is the wilting of plants, which leads to stunting. Roots will be blackened and decayed. In final stages of the disease the stem begins to turn black, hence the name black shank. As this happens, tobacco leaves turn brown and become not marketable.