green dragon

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A tuberous plant (Arisaema dracontium) of eastern North America, having divided leaves and minute flowers at the base of a long slender spadix projecting from a narrow green spathe.

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

• noun European arum resembling the cuckoopint
• noun early spring-flowering plant of eastern North America resembling the related jack-in-the-pulpit but having digitate leaves, slender greenish yellow spathe and elongated spadix