Whitetops are a type of invasive plant species that grow in North America. They are also known by a variety of other names, including hoary cress, peppergrass, and kearny's white top. These synonyms are often used interchangeably and may depend on the specific region or context in which the plant is being referred to. Other possible synonyms for whitetops include cheatgrass, bullwhip kelp, and wild mustard. Despite their different names, all of these plants share common characteristics including their invasive nature, ability to outcompete native vegetation, and resistance to control measures. As such, it is important to address these plants using effective management strategies to mitigate their negative impacts on ecosystems and agriculture.