Robert W. Freckmann Herbarium


  Cirsium altissimum (L.) Spreng. image
Photographer: Merel R. Black           

Derek Anderson

Derek Anderson

Derek Anderson

Kitty Kohout

Merel R. Black

Merel R. Black

Merel R. Black

Merel R. Black

Paul Drobot

Paul Drobot

Paul Drobot

Paul Drobot

Paul Drobot

Paul Drobot

Robert Bierman
Family Asteraceae
Cirsium altissimum (L.) Spreng.
tall thistle, wood thistle
Cirsium: derived from the Greek kirsion, "a kind of thistle;" also cirsos meaning "a swollen vein" for which thistle was once a remedy
altissimum: Latin for "especially tall"
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Native
Plant: erect, (biennial?)/perennial, 3'-10' tall, widely branched, spiny forb
Flower: head up to 1 1/4 wide with pink to purple disk flowers; inflorescence of one to many heads on a somewhat leafy stalk; blooms July-Oct.
Fruit:dry seed on fluffy, feathery-divided pappus
Leaf:large, with spiny teeth or shallow lobes but not divided, underside with dense, whitish fuzz
Habitat: dry to moderate moisture; fields, disturbed sites, open woods
Notes: similar to C. discolor
(Glossary)

More Information Natural Communities Herbarium Specimens
All Cirsium list Google- Images or Text

Flora of North America (off site)
Synonyms 
Carduus altissimus L.
Cirsium altissimum (L.) Spreng. var. biltmoreanum Petr.
Cirsium iowense (Pammel) Fernald
Cirsium X iowense (Pammel) Fernald (pro sp.)
Cnicus iowensis Pammel

         
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