cardinal flower

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

• noun A perennial lobelia (Lobelia cardinalis) native to central and eastern North America, having an elongate cluster of showy, brilliant red flowers.

from The Century Dictionary.

• noun The name commonly given to Lobelia cardinalis, because of its large, very showy, intensely red flowers: it is a native of North America, and is often cultivated in gardens.

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

• noun North American lobelia having brilliant red flowers