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Retrieving a term tree for a specific vocabulary in Drupal 8 requires the vocabulary ID. I can find no function/method/service that will return the vocabulary entity given the machine name, in order to get the vocabulary ID.

How do I get a vocabulary ID from its machine name?

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The vid field is the machine name for a vocabulary in Drupal 8.

You just need to pass the the string you have to TermStorage::loadTree, it doesn't need to be altered. For example:

$terms = \Drupal::entityManager()->getStorage('taxonomy_term')->loadTree("myname");
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    That would certainly explain why I couldn't find one! Thanks, Clive! – JAyenGreen Mar 6 '17 at 16:15

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