Hoary alyssum (Berteroa incana)
Appearance: Annual, occasionally biennial herbaceous plant 1 1/2 - 2' tall with an erect branched downy stem.
Leaves: Alternate, small lance-shaped and covered with a grayish down.
Flowers: Tiny white flowers are arranged in elongated clusters along a central stem, each flower with four deeply divided petals; blooming June through August.
Seeds: Seeds are round to oblong narrowly winged.