Definition of "whitetop" [white•top]

• A perennial herb that reproduces by seeds and by horizontal creeping roots. (noun)

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• "Cheatgrass had moved in along with leafy spurge, Canada thistle and whitetop, all noxious weeds."
• "Through the years I have written about various noxious weeds, including tall whitetop, knapweeds, Canada thistle, yellow starthistle, hoary cress and puncturevine."
• "If you have ever tried to remove tall whitetop or Russian knapweed from your property, you know it is a multiyear battle that never ends."