Snake's-head /(?)/

Snake's·-head

Snake's-head

n.
  1. The Guinea-hen flower; -- so called in England because its spotted petals resemble the scales of a snake's head. (Bot.)

Phrases & Compounds
Snake's-head iris
an iridaceous plant (Hermodactylus tuberosus) of the Mediterranean region. The flowers slightly resemble a serpent's open mouth.