Centaurea jacea L.

Fam: Asteraceae (Compositae)

Genus: Centaurea L. = Cornflower 

Species: Centaurea jacea L. 

English Name: Brown Knapweed or Brownray Knapweed


Centaurea jacea  is a species ofherbaceous perennial plants in the genus Centaurea native to dry meadows and open woodland throughout Europe. It grows to 10–80 cm tall, and flowers mainly from June to September.

In Britain, it is often found as a hybrid of Black Knapweed,  Centaurea nigra.

Unlike the Black Knapweed, the flowerheads always look as if they are rayed, forming a more open star rather than a brush-like tuft.

Flowering Time: mainly from June to September.

Reference: From Wikipedia, the free encyclopedia"

Distribution in Bulgaria:  Throughout Bulgaria. (Conspectus of the Bulgarian Vascular Flora) conspectus&gs_l= Zlc  

Distribution:  Throughout Europe.

Conservation status and threats:  not protected species in Bulgaria by the Biodiversity Law Приложение № 3, към член 38; Законодателство на Република България: Закон за биологичното разнообразие.

Medical plant: it is not medical plant: -  

1. 2. 3. 4. 5. 6. 7. 8.

Centaurea jacea 1. Centaurea jacea 2. Centaurea jacea 3. Centaurea jacea 4.

Centaurea jacea 5. Centaurea jacea 6. Centaurea jacea 7. Centaurea jacea 8.


Centaurea jacea - Brown Knapweed or Brownray Knapweed

Baskets from small to relatively large, in its central part with hermaphrodite flowers and are generally larger in circumference blossoms asexuallarger flowers on the periphery. Leaf sheath tightly arranged like tiles in multiple rows. Each leaf ends with dry membranous appendage, many times with ciliary edge, sometimes ending with a thistle or all become branched thistle. Anthers at its base or be swept or maintained in pigtails. General bed of the blossom bristly-hairy. Fruits lanky cylindrical, usually slightly flattened with belly button located at the side, at the base. Kite consists of several rows of bristles, often lacking.
Wrapping petals atop his suddenly expanded non down running appendage. Involucral appendage of leaves never ends with thistle, never ends with thistle, but cilia or without cilia. Appendages of involucral leaflets on his top without screwed back threadlike appendage. Leaves whole or roughly chopped, but not feathery. Appendages of involucral leaflets cover the nail at the front petals.

2950. (27). C. jacea L. - (Perennial) in grassy places and bushy places. Distributed mainly in the lowlands and foothills (1 - 2), VI - IX. (M, T, L). Fig. 1481.
In our country:
ssp. banatica (Roch.) Hayek. (C. b. Roch. C. jacea var. Rocheliatiana Heuff.) - Appendages all wrapping petals entire or torn edges, but without cilia or almost without cilia. Leaves relatively broad. Appendages pale; foreign often with small cilia. Throughout the country.
ssp. angustifolla (Schk.) Gugl. (C. a. Schk.) - Leaves narrow, narrowly lance and usually quite densely fibrous. Appendages as in the preceding subspecies. In Bulgaria: var. pannonica (Heuff.) Gugl. (C. amara var. P. Heuff.) - Appendages of involucral leaflets large and almost closed nails; internal and medium brown, often whitish external. Mainly in Southwestern Bulgaria.
ssp. razgradensis (Vel.) Stoj. et Acht. (C. r. Vel., C. markiana Wagn., C. bulgarica Urum. et Wagn.) - Appendages of involucral leaflets comb-ciliates. At the foot of the mountains.
Remark: C zlatarskyana Urum. et Wagn., described for Karlovo region and given in the literature also for Sofia  region is no systematic value, as described accidentally deformed plants.


„Флора на България”, Н. Стоянов, Б. Стефанов, Б. Китанов, част II, Наука и Изкуство, София, (1967)


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Centaurea jacea 9. Centaurea jacea 10. Centaurea jacea 11. Centaurea jacea 12.

Centaurea jacea 13. Centaurea jacea 14. Centaurea jacea 15. Centaurea jacea 16.



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