Photo of whorled milkweed flowers.

    Milkweeds

    Subfamily Asclepiadoideae
    spotted knapweed

    Spotted Knapweed

    Centaurea stoebe
    invasive icon

    Invasive

    Photo of white heath aster flowers

    White Heath Aster

    Symphyotrichum pilosum (formerly Aster pilosus)