Whitetop, Hoary Cress, Pepperweed Whitetop, Wild Broccoli, Lepidium draba, Mustard Family (Brassicaceae)

​Found in disturbed soil, fields, roadsides
Seen blooming in May outside San Juan School, Ohkay Owingeh
Whitetop grows to two feet tall in dense clumps with stout stems. Leaves are grayish-green and clasp the stems, basal leaves wither at flowering. Numerous tiny white flowers with four petals grow in flat-topped clusters two inches across. Seeds are heart-shaped. Whitetop is a very invasive species that spreads from its roots as well as by seeds, a single plant can produce 1,200 to 4,800 seeds. It is considered a noxious weed in New Mexico and many other states. As one of its common names, Wild Broccoli, implies, it is an edible plant. The edible parts are the young leaves and immature flower tops, which look like tiny florets of broccoli. Like many plants in the mustard family, they have a spicy hot-mustard flavor. Seeds are used as a pepper substitute. Medicinally, Whitetop has been used for preventing scurvy and as a bitter spring tonic. Source.
If you trying to identify a different flower then you can check what other flowers bloom this month. If you cannot identify a flower from the website, send a photo and where you took it to [email protected]. Read online for tips.