Fun fact: All of these flowers were specifically chosen for their meaning in Hanakotoba. Heres a slimmed down version of the artist's explanation:

Buttercups - Happiness, sad memories
Lilies - Innocence
Balsam - "Don't touch me"
Blue rose - Obtaining the impossible, "God's blessing"
Ivy - Sincerity, love, friendship
Chamomile - Overcoming hardships
Thistle - Independence, satisfaction, "stay away from me", "hate humans"
Gloriosa - Bravery, genius, passion

And the petals coming down from the top right are meant to symbolize Dante.