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 (pĭngk′ro͞ot′, -ro͝ot′)
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


(ˈpɪŋkˌrut, -ˌrʊt)

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.
[1755–65, Amer.]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.pinkroot - a fungal disease of onions
plant disease - a disease that affects plants
References in periodicals archive ?
Examples include Tennessee milk-vetch (Astragalus tennesseensis), water locust (Gleditsia aquatica), Amazon sprangletop (Leptochloa panicoides), Lesquereux's mustard (Lesquerella globosa), cylindric-fruited seedbox (Ludwigia glandulosa), plains muhlenbergia (Muhlenbergia cuspidata), glade mallow (Napaea dioica), Canada burnet (Sanguisorba canadensis), Forbes' saxifrage (Saxifraga forbesii), and woodland pinkroot (Spigelia marilandica).
Some of the prettiest woodland medicinals include pinkroot (Spigelia marilandica; shown at right) and fragrant black cohosh (Actaea racemosa), which thousands of women use to ease the symptoms of menopause.
Framed by 90-year-old oaks, his yard is a tangle of native and exotic plants: pinkroot, angel's trumpet, Miss Robb's bonnet.