horse thistle, Onopordum acaulon  (Asterales: Asteraceae) - 5472448

horse thistle
Onopordum acaulon L.

Descriptor: Fruit(s)
Description: Achenes without pappus. At the base of each achene is a light-colored, shiny appendage that is the elaiosome (on left on first two fruits, on right on third fruit). FNW taxon.
Image type: Laboratory
Image view: Face
Image location: photographed in laboratories at CDFA in Sacramento, CA and at CPHST in Fort Collins, CO, California, United States

Specimen Information

Specimen in collection: Yes
Collection Name: California Department of Food and Agriculture
Taxon Name: Onopordum acaulon
Type specimen: No
Specimen Condition: Dry storage
Identification Method: Morphological Analysis - Visual

Photographer Information

Name: Deena Walters
Organization: USDA APHIS PPQ CPHST ITP
Country: United States

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Image Number: 5472448

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Creative Commons License    This work is licensed under a Creative Commons Attribution-Noncommercial 3.0 United States License.

Image Use:(?) You must attribute the work in the manner specified (but not in any way that suggests endorsement). You may not use this work for commercial purposes unless permission is granted by the photographer or copyright owner.

Image Citation:(?) Deena Walters, Federal Noxious Weeds Disseminules, USDA APHIS ITP, Bugwood.org

Node Affiliation: USDA APHIS ITP
Image Source: Federal Noxious Weeds Disseminules

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Image uploaded on Thursday, May 17, 2012
Image Information last updated on Thursday, May 17, 2012