pinkroot

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

• noun A perennial plant (Spigelia marilandica) native to the southeast United States having flowers with a tubular corolla that is red outside and yellow inside. The rhizomes and roots were once used as a vermifuge.

from The Century Dictionary.

• noun The root of the Carolina or Indian pink, Spigelia Marilandica, a well-known vermifuge officinal in the United States: in large doses narcotic-poisonous.
• noun The plant itself, an herb with showy flowers, red outside, yellow inside, common southward in the United States. Also called Maryland pinkroot and worm-grass.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Med.) The root of Spigelia Marilandica, used as a powerful vermifuge; also, that of Spigelia Anthelmia. See definition 2 (below).
• noun A perennial North American herb (Spigelia Marilandica), sometimes cultivated for its showy red blossoms. Called also Carolina pink, Maryland pinkroot, and worm grass.
• noun An annual South American and West Indian plant (Spigelia Anthelmia).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A perennial North American herb (Spigelia marilandica), sometimes cultivated for its showy red blossoms.
• noun An annual South American and West Indian plant (Spigelia anthelmia).
• noun The root of Spigelia marilandica or Spigelia anthelmia, used as a powerful vermifuge.

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

• noun a fungal disease of onions