forget-me-not

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Any of various herbaceous plants of the genus Myosotis, having clusters of small blue flowers. Also called scorpion grass.
2. n. Any of several similar or related plants.

Century Dictionary and Cyclopedia

1. n. The ground-pine, Ajuga Chamœpitys: the earliest use of the word, in the old English herbalists.
2. n. Myosotis palustris, a boraginaceous plant of Europe, growing in damp or wet places, and naturalized in some parts of the United States. It has circinate racemes of sky-blue flowers with a yellow center. (See cut under circinate.) As the emblem of friendship, it hears a name corresponding in sense to the English name in nearly every language in Europe; but it was not so called in England and France till the early part of the nineteenth century. Some other similar species of Myosotis are frequently cultivated under this name, especially M. dissitiflora and the dwarf M. alpestris.
3. n. In Scotland and some parts of England, Veronica Chamœdrys. See Veronica.

Wiktionary

1. n. A genus of flowering plants of the genus Myosotis, mostly with a small 5-petalled blue flower.

GNU Webster's 1913

1. n. (Bot.) A small perennial herb, of the genus Myosotis (Myosotis scorpiodes, Myosotis palustris, Myosotis incespitosa, etc.), bearing a beautiful bright blue or white flowers, and extensively considered the emblem of fidelity.

WordNet 3.0

1. n. small perennial herb having bright blue or white flowers