Invasive native range: Western Siberia
Invasives
![](https://cisma-suasco.org/wp-content/uploads/2018/03/rusty-willow-2.png)
European Rusty Willow and Gray Willow (Salix atrocinerea (L.) Gaertn.) and Gray Willow (S.cinerea (L.) Gaertn.)
European rusty willow is a tall shrub or small tree that grows up to 50 feet tall; it has smooth gray-green bark with a waxy texture and raised ridges in the wood. Gray willow is a multi-stemmed shrub that may grow up to 20 feet tall. The two willows are…
![](https://cisma-suasco.org/wp-content/uploads/2018/03/spotted-knotweed-300x201.jpg)
Spotted Knapweed (Centaurea stoebe)
Spotted knapweed, previously known as Centaurea biebersteinii, is a biennial or short-lived perennial. Its name is derived from the spots formed by black margins on the flower bract tips. Spotted knapweed typically forms a basal rosette of leaves in its first year and flowers in subsequent years. Rosette leaves are…