You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allredirects garcontinue="Black_pepper|571" />
  </query-continue>
  <query>
    <pages>
      <page pageid="575" ns="0" title="Betula pendula" />
      <page pageid="706" ns="0" title="Beta- bourbonene" />
      <page pageid="775" ns="0" title="Betula alba" />
      <page pageid="780" ns="0" title="Betula lenta" />
      <page pageid="1155" ns="0" title="Citrus aurantium bergamia" />
      <page pageid="1200" ns="0" title="Pimenta racemosa" />
      <page pageid="1817" ns="0" title="Picea mariana" />
      <page pageid="2539" ns="0" title="Tetradium daniellii" />
      <page pageid="2636" ns="0" title="Nerolin yara yara" />
      <page pageid="2664" ns="0" title="Oranger crystals" />
    </pages>
  </query>
</api>