Hybrid Knapweed (Centaurea x psammogena)

 
 
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C. diffusa C. stoebe ssp. micranthos

Description
Flowers are purple or white. Bracts have a dark tip (similar to Spotted Knapweed) and long bristles on the margins (similar to Diffuse Knapweed).

Key Identifiers

  • Plant will share traits from both Spotted and Diffuse Knapweeds
Location in Canada
BC, Ontario and Quebec are known to have hybrid populations. Since Alberta has both Spotted Knapweed and Diffuse Knapweeds, hybridization between the two is possible.

www.easterncoloradowildflowers.com

Resources
Pacific Northwest Extension Publication - Identification of Knapweed and Starthistles in the Pacific Northwest

Similar species
(Centaurea spp.)Other knapweeds are going to be similar to hybrid knapweed. The key feature for differentiating all knapweeds from one another is to compare the unique bracts. The link under “Resources” is an excellent resource to walk you through identifying knapweeds. Hybrids are extremely difficult to ID correctly. If you have a suspect hybrid please submit a dried sample to a qualified specialist.

May be mistaken for a thistle at a passing glance but upon inspection, leaves and stems of hybrid knapweed lack spines.
 
 
 
 

Other Documents in the Series

 
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Black Knapweed (Centaurea nigra)
Brown Knapweed (Centaurea jacea)
Common Crupina (Crupina vulgaris)
Common St John's-wort (Hypericum perfoatum)
Diffuse Knapweed (Centaurea diffusa)
Dyer's Woad (Isatis tinctoria)
Garlic Mustard (Alliaria petiolata)
Giant Hogweed (Heracleum mantegazzianum)
Giant Knotweed (Fallopia sachalinensis)
Hoary Alyssum (Berteroa incana)
Hybrid Japanese Knotweed (Fallopia x bohemica)
Hybrid Knapweed (Centaurea x psammogena) - Current Document
Japanese Knotweed (Fallopia japonica)
Marsh Thistle (Cirsium palustre)
Meadow Hawkweed (Hieracium caespitosum)
Meadow Knapweed (Centaurea x moncktonii)
Mouse-ear Hawkweed (Hieracium pilosella)
Nodding Thistle (Carduus nutans)
Plumeless Thistle (Carduus acanthoides)
Puncturevine (Tribulus terrestris)
Red Bartsia (Odontites vernus)
Rush Skeletonweed (Chondrilla juncea)
Russian Knapweed (Rhaponticum repens)
Saltlover (Halogeton glomeratus)
Spotted Knapweed (Centaurea stobe ssp. micranthos)
Squarrose Knapweed (Centaurea virgata ssp. squarrosa)
Sulphur Cinquefoil (Potentilla recta)
Tansy Ragwort (Jacobaea vulgaris/Senecio jacobaea)
Tyrol Knapweed (Centaurea nigrescens)
Yellow Starthistle (Centaurea solstitialis)
 
 
 
 
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For more information about the content of this document, contact Nicole Kimmel.
This document is maintained by Shelley Barkley.
This information published to the web on April 2, 2012.
Last Reviewed/Revised on March 21, 2014.