The Mission of the Yellowstone County Weed Department is to assist the public, private, and other government agencies to manage and control existing noxious weed infestations as well as to prevent new invasive species from infesting Yellowstone County.

Hoary AlyssumBerteroa incana

Photo from Weeds of Nebraska and the Great Plains

Toxic

Rosette

Stem

Leaf

Bloom

Patch

Attribute	Description
Toxicity	Horses, even when cured in hay.
Growth Habit	Annual forb that grows 1 to 2.6 feet in height.
Leaves	Alternate; blades simple, oblanceolate to occasionally elliptic, tip sharply pointed to blunt or rounded, margins entire, grayish-green, stellate (star-shaped) pubescence.
Stem	Stiffly erect, usually branching above, grayish-green, stellate (star-shaped) pubescence.
Flower	White; petals 4, deeply divided; short filaments flanked on each side by a short semicircular gland; sepals 4, equal, ascending.
Roots	Taproot.
Seeds	Round to oblong, narrowly winged, grayish-brown, and rough.
Reproduction	Seeds.
Habitat	Hoary Alyssum can be found in pastures, small grain fields, roadsides, and waste areas.
Biological Control	—
Herbicide	2,4-D.
Caution	Hoary Alyssum is toxic to horses.