According to some observers, there is a tendency for buttercups to have 5 petals, bloodroots 8, fireweeds 13, asters 21, common field daisies 34, and Michaelmas daisies 55 or 89.
Menurut beberapa pengamat, ada kecenderungan bahwa bunga buttercup memiliki 5 daun mahkota, bunga boodroot 8, bunga fireweed 13, aster 21, common field daisy 34, dan aster New England 55 atau 89.