shad-flower

from The Century Dictionary.

• noun An abundant low herb like a miniature sweet alyssum, blooming when the shad appear in the rivers; the whitlow-grass, Erophila vulgaris, better known as Draba verna.
• noun Same as shad-bush.
• noun The trailing arbutus, Epigæa repens.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun annual weed of Europe and North America having a rosette of basal leaves and tiny flowers followed by oblong seed capsules