tom thumb
noun
1
- usu. as modifier a dwarf variety of a cultivated flower or vegetable矮生花卉, 矮生蔬菜：
Tom Thumb lettuce.
矮生莴苣。
2
- a small wild flower, especially bird's-foot trefoil小野花（尤指牛角花）。
词源
late 19th cent.: from the name of the hero of a children's story, a ploughman's son who was only as tall as his father's thumb.