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"All of " and "Of all "

There is a sentence :Of all the economically important plants, palms have been the least studied.

why don't write :All of the economically important plants, palms have been the least studied.

so , “all of” and "of all“ what have them diffiernte

For learning: English
Base language: English
Category: Language

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    "Of all the economically important plants, palms have been the least studied" is essentially a rewording of "Palms, of all the economically important plants, have been the least studied".

    I just wrote this in another topic:
    'Of' indicates something's origin or composition.

    A bar of gold = a bar made from gold
    Mary of London = Mary, who comes from London (every person's name used to say where they came from in this manner, but has since been replaced by last names).
    George of the jungle = George, who is from the jungle

    It can be extended to possession:
    Marie's car = a car of Marie
    George's couch = the couch of George
    The son of Bill = Bill's son
    King of the jungle = The jungle's king
    Lord of the Rings = The rings' lord.
    http://www.italki.com/question/194458

    With that in mind, 'All of...' indicates that you are referring to everything that makes up whatever group that follows. ie. "All of the plants" refers to every single plant (it's said this way because "plant's all" can't be).

    By starting a sentence with 'Of all...', you're indicating that what you're talking about is part of the aforementioned group. Instead of saying "Palms are the least studied economically important plants", the sentence rearranges it to "Palms, of all the economically important plants, have been the least studied". This is saying that palms are the least studied ONLY among the economically important plants.

    "Palms, of all the economically important plants, have been the least studied", due to how English sentences are constructed, can be your sentence: "Of all the economically important plants, palms have been the least studied".

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