Flora of Pennsylvania

Cirsium arvense gallery

Canada Thistle Gallery

Flowers
Flowers
Ballas Park (Northampton Co)
by Paul Nale on 06/18/2025
Plant in flower
Plant in flower
North Park (Allegheny Co)
by Maria G. Pavlova on 06/16/2020
Flower heads and leaves
Flower heads and leaves
North Park (Allegheny Co)
by Maria G. Pavlova on 06/16/2020
Flower buds
Flower buds
North Park (Allegheny Co)
by Maria G. Pavlova on 06/24/2020
Thistle habitat
Thistle habitat
North Park (Allegheny Co)
by Maria G. Pavlova on 06/24/2020
Leaves
Leaves
Bradford Co
by Colin Gillette on 06/30/2022
Flower
Flower
Bradford Co
by Colin Gillette on 06/30/2022
Plant in flower
Plant in flower
Spring Creek (Centre Co)
by Maria G. Pavlova on 06/30/2022
Flowers
Flowers
Buffalo Run Park (Centre Co)
by Maria G. Pavlova on 07/23/2024
Fruit
Fruit
Bradford Co
by Colin Gillette on 08/03/2022
Fruit
Fruit
Bradford Co
by Colin Gillette on 08/03/2022
Plant form
Plant form
Boalsburg Creek (Centre Co)
by Maria G. Pavlova on 10/25/2021