forget-me-not

Short definition from Wiktionary

Noun

1. 1
   Any of the flowering plants of the genus Myosotis, mostly with a small five-petalled blue flower; a flower from such a plant.
2. 2
   A light tint of blue, the color of the flower.
3. 3
   Any of various light-blue coloured lycaenid butterflies of the Asian and Australasian genus Catochrysops, especially Catochrysops strabo native to India and Southeast Asia.