Hi,

TY Steve, MacColl called it the "blind worm" motive, if that helps.

9th stanza in The Lady's Lamentation;

9. There is a flower as I've heard say,
I wish I could that flower find,
It would ease my heart,
And cure my mind.

which is taken from Oxfordshire Tragedy where the flower is a heart-ease if I remember correctly.

In Johnson's 1611 version there's and herb called Dead-Man's Thumb but no worms!!!

Richie