idleness : Idioms & Phrases

• noun a common and long cultivated European herb from which most common garden pansies are derived
  pink of my John; wild pansy; Johnny-jump-up; Viola tricolor; heartsease.
  

WordNet

• (Bot.), a kind of violet; the small pansy.

  A little western flower, Before milk-white, now purple with love's wound; And maidens call it love-in-idleness. Shak.

Webster 1913