PRIORITY 1A weeds are not present in Montana or have a limited presence. Management criteria will require prevention, education, and eradication if detected.
 

Noxious Weed Species Common Name	Scientific Name
Dyer's Woad	Isatis tinctoria
Yellow Starthistle	Centaurea solstitialis
Medusahead	Taeniatherum caput-medusa
Common Reed\Phragmites	Phragities australis