Patuxent Research Refuge, Maryland
Catalog #: PRR001066
Taxon: Cirsium vulgare (Savi) Ten.
Family: Asteraceae
Determiner: Bill Harms (s.d.)
Taxon Remarks: Canada Thistle
ID References: Flora of the Southeastern United States, Weakley 2015
Show Determination History
Collector: Bill Harms   6810   
Date: 2011-07-27
Verbatim Date: 27 July 2011
Additional Collectors: Zach Cravens, Emily Sadowski, Kyle Neuman
Locality: United States, Maryland, Anne Arundel, Laurel, Patuxent Research Refuge--North Tract--Thomas Branch Swamp area; BGE Power Line Right-of-way Access Road, 1.2 miles northwest of Duvall Bridge Road, past Thomas Branch Power Line Area (Thomas Branch Swamp) under tower
39.061287  -76.791468 +-20m.  WGS84
Verbatim Coordinates: 39.061287 -76.791468
Elevation: 32 meters
Verbatim Elevation: 106 feet
Habitat: Open shrub meadow in cleared power line right-of-way
Substrate: dry well-drained soil
Preparations: Imaged Voucher
Establishment Means: Alien
Specimen Images
Access Rights: The database records found here may be used by researchers for non-commercial purposes. If any of these records are used in an analysis, report or publication, the provenance of the original data must be acknowledged and the PRR Herbarium notified.
Record Id: c1f55481-f65a-44de-944b-fe92aa294b3f
Occurrence ID (GUID): c1f55481-f65a-44de-944b-fe92aa294b3f
For additional information on this occurrence, please contact: Bill Harms (
Current Record
Patuxent Research Refuge, Maryland (USFWS:PRR)
Bill Harms 68102011-07-27
Catalog Number: PRR001066
GUID: c1f55481-f65a-44de-944b-fe92aa294b3f
Latest Identification: Cirsium vulgare
Identified by: Bill Harmss.d.

University of Maryland, Norton-Brown Herbarium (MARY)
Bill Harms 68102011-07-27
Catalog Number: MARY1051162
Latest Identification: Cirsium vulgare

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