Home Plants Control Options ID Systems
PMIS Home
Plant Info Overview
Plant List
       Total List
       By Plant Type
Plant ID Systems
       Expert ID Sys
       Continue Expert ID Sys
       Free Selection ID Sys
Glossary
Last Updated: Spring 2011
 

Synonyms: NONE

Family: Asteraceae

Home Range/U.S. Introduction:
This species, a native of Europe, was cultivated in the United States and has escaped. In some areas, it is becoming naturalized.

U.S. Range Map:





Species Description:
Scotch thistle is a cottony pubescent biennial herb. The leaves are alternate, simple, and net-veined. The blades have pinnate major veins, and the margins are spiny tipped on lobes or teeth. The heads are in a flat-topped aggregation (corymb-like) and terminal. The flowers are disk only, purple, and perfect. The fruit is an achene with a pappus of bristles.

Habitat/Growth Characteristics:
Plants grow in cultivated fields, waste areas, and often in the edges of forests. It is a "sticky", drought-resistant plant that can reproduce by seeds.

Problems:
The sticky and seed-producing habits allow scotch thistle to choke out cultivated crops in fields and native species in other areas. Its drought-resistant characteristic makes it difficult to eradicate.