Berteroa Species, Bunny's Ears, Hoary Alyssum, Hoary False Madwort

On Minnesota DNR invasive list
"Ecological Threat:
Hoary alyssum, a native of Europe, does not pose a threat to intact nat...Read Moreive grasslands at this time.
It displaces native species particularly in dry prairies and sand blowouts where vegetation is sparse. It is most abundant in disturbed dry areas, fields and waste places.
It can be a nuisance in prairie reconstruction but declines as prescribed burns are administered.
Hoary alyssum in on the MDA Secondary noxious weed list in Minnesota. "

This plant can be toxic to horses if ingested, causing stocking up, depression, and in some cases even death.