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Photographer: Steve C. Garske
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Family Asteraceae
Cirsium palustre (L.) Scop.
European swamp thistle, marsh thistle
Cirsium: derived from the Greek kirsion, "a kind of thistle;" also cirsos meaning "a swollen vein" for which thistle was once a remedy
palustre: "of marshes"
Prohibited/Restricted Invasive - Eradicate!
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| Status: | Introduced - naturalized; ecologically invasive |
| Plant: | erect, biennial, 1' - 6 1/2' tall forb; stems spiny-winged |
| Flower: | head 3/4" wide with purple disk flowers, bracts (phyllaries) tips not spiny; inflorescence of usually many clustered heads; blooms June-July |
| Fruit: | dry seed on fluffy, feathery-divided pappus usually less than 1/3" long |
| Habitat: | we to moist; woods, roadsides |
| (Glossary) |
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