Wild Leek is my favorite id so far for the plant on fol.55v of the Voynich Manuscript. It could be Allium tricoccum or Allium ursinum. They are very similar - the second one is favorite of the wild boar and a wild pig may be hidden in the roots of the drawing on this page.
UPDATE. Steve D suggested the Elephant garlic (Allium ampeloprasum) as possibility. So, the wild boar may be an elephant. Example from herbal manuscript of elephant drawing is the British Library Sloane 4016 (visit here). Nick Pelling saw the elephant root in 2003.