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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. Also called wormgrass.
1. (Plants) any of several loganiaceous plants of the genus Spigelia, esp S. marilandica, of the southeastern US, having red-and-yellow flowers and pink roots
2. (Plants) the powdered root of this plant, used as a vermifuge
3. (Plant Pathology) a fungal disease of onions and related plants resulting in stunted growth and shrivelled pink roots
any of various plants belonging to the genus Spigelia, of the logania family, esp. S.marilandica of the U.S., the root of which is used as a vermifuge.