A wild flowering plant Bellis perennis of the Asteraceae family, with a yellow head and white petals
Many other flowering plants of various species, mostly among the asterids.
A boot or other footwear.
A ctenophore, a member of the phylum Ctenophora (the comb jellies).
A cnidarian, a member of the phylum Cnidaria.
A scyphozoan, a member of the class Scyphozoa (the true jellies).
A sudoku technique involving possible cell locations for a digit, or pair, or triple, in uniquely four rows and four columns only. This allows for the elimination of candidates around the grid.