HYBRID KNAPWEED

Centaurea × gerstlaueri

(Formerly: Centaurea moncktonii and Centaurea drucei).
Daisy & Dandelion Family [Asteraceae]

Flowers:
month8jun month8june month8jul month8july month8aug month8sep month8sept

Pappus: pappusZpossible (short, brown)
pappus8aug pappus8sep pappus8sept pappus8oct

status
statusZalien
flower
flower8purple
inner
inner8white
morph
morph8actino
petals
petalsZMany
stem
stem8round

2nd Aug 2009, ex-Windsor High School grounds, Salford, Lancs. Photo: © RWD
A branched perennial growing up to 2 feet tall.


2nd Aug 2009, ex-Windsor High School grounds, Salford, Lancs. Photo: © RWD
Flower buds predominantly brownish rather than blackish.


2nd Aug 2009, ex-Windsor High School grounds, Salford, Lancs. Photo: © RWD
There is a full spectrum of variations in the hybrid between its two parents, Common Knapweed and Brown Knapweed.


2nd Aug 2009, ex-Windsor High School grounds, Salford, Lancs. Photo: © RWD
Phyllaries are mid to dark-brown (the 'shield') with irregularly toothed and deeply jagged upper portions. Is this the pappus?



Not to be semantically confused with: Common Centaury (Centaurium erythraea) nor with similar Centauries such as Seaside Centaury (Centaurium littorale) [plants whose scientific names are similar, but which are in a totally different Family altogether, the Gentian Family (Gentianaceae)].

Easily mistaken for : Common Knapweed

Is the Hybrid between Brown Knapweed (Centaurea jacea) and Common Knapweed (Centaurea nigra).

Not to be confused semantically with : Knotgrasses such as Knotgrass, Cornfield Knotgrass, Equal-leaved Knotgrass or Northern Knotgrass which belong to the Dock & Knotweed Family, namely Polygonium [they both have similar names]. Nor should they be confused with Knotweeds such as Giant Knotweed, Japanese Knotweed or Lesser Knotweed which also belong to the Dock & Knotweed Family (Polygonium).

There were two bunches of Knapweeds side by side in the grounds of the recently demolished Windsor High School in Salford; the two distinctly different from one another in that the buds of one were decidedly a much lighter shade of brown. Eventually it dawned on the author that one might just be Brown Knapweed (Centaurea jacea) which is rather rare, or the hybrid between that and Common Knapweed called Hybrid Knapweed. Considering the rarity of the former, he opted for the latter, especially as Hybrid Knapweed may well sometimes be planted in gardens. The size and shape of the phyllaries (which are on the spherical flower buds immediately below the purple flowers and frayed like hessian string) seems to confirm that hypothesis.

Grows in waste places and other rough ground.


  Centaurea × gerstlaueri  ⇐ Global Aspect ⇒ Asteraceae  

Distribution
 family8Daisy & Dandelion family8Asteraceae

 BSBI maps
genus8Centaurea
Centaurea
(Knapweeds)

HYBRID KNAPWEED

Centaurea × gerstlaueri

(Formerly: Centaurea moncktonii and Centaurea drucei).
Daisy & Dandelion Family [Asteraceae]

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