Image of Rydberg's thistle
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Rydberg's Thistle

Cirsium rydbergii Petr.

Walter Fertig   cc-by-nc-4.0

Cirsium rydbergii (Rydberg's Thistle) is a species of perennial herb in the family Asteraceae. They are native to The Contiguous United States. They have achenes.

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  • URI: http://purl.obolibrary.org/obo/PO_0030107
  • Definition: a fruit which develops from a carpel or gyneocium and at maturity comprises a dry exocarp, a dry mesocarp, and a dry endocarp that are connected to a seed coat by a funicle
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EOL has data for 13 attributes, including:

Known occurrences, collected specimens and observations of Rydberg's thistle. View this species on GBIF