1A
Plumeless Thistle
Carduus acanthoides
Plants not known to be in Utah, but thought to be present in neighboring states. If found in the state, swift eradication of any plants in this category is a very high priority.
Description
A winter annual or biennial. Plumeless thistle can grow over 5 feet tall on spiny-winged stems. Rosette leaves are wavy, with white margins. Leaves are hairy underneath and spiny at the margins. Purple flower heads are borne in clusters at the spiny stem tips throughout the summer.
