
1) Asterid dicot genus 2) Genus centaurea 3) Knapweed 4) Star thistle
Found on
https://www.crosswordclues.com/clue/centaurea

Centaurea (ə) is a genus of between 350 and 600 species of herbaceous thistle-like flowering plants in the family Asteraceae. Members of the genus are found only north of the equator, mostly in the Eastern Hemisphere; the Middle East and surrounding regions are particularly species-rich. Common names for this genus are centaury, centory, starthis...
Found on
http://en.wikipedia.org/wiki/Centaurea

• (n.) A large genus of composite plants, related to the thistles and including the cornflower or bluebottle (Centaurea Cyanus) and the star thistle (C. Calcitrapa).
Found on
http://thinkexist.com/dictionary/meaning/centaurea/

genus of about 500 species of herbaceous plants of the composite family (Asteraceae). Most are native to the Old World and chiefly centred in the ...
Found on
http://www.britannica.com/eb/a-z/c/43

(Bachelor's-Button, Basket Flower, Cornflower, Dusty Miller, Knapweed, Mountain Bluet, Sweet Sultan) These are hardy, herbaceous, perennial and annual plants that are natives of many European countries, in North America and other numerous places. Some of the herbaceous kinds make very nice border plants. Centaureas belong to the Daisy family, Compo...
Found on
http://www.encyclo.co.uk/local/10004
Cen`tau·re'a noun [ New Latin See
Centaury .]
(Botany) A large genus of composite plants, related to the thistles and including the cornflower or bluebottle (
Centaurea Cyanus ) and the star thistle (
C. Calcitrapa ).
Found on
http://www.encyclo.co.uk/webster/C/43

Centaurea is a genus of some 500 species of composite plants. They are all annual or perennial herbs with alternate leaves and single heads, the florets of which are tubular, and are found in Europe, Western Asia and North Africa. The genus includes the cornflower, purple sultan, white sultan and knapweed.
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http://www.probertencyclopaedia.com/browse/BC.HTM

[
n] - knapweed
Found on
http://www.webdictionary.co.uk/definition.php?query=Centaurea
genus Centaurea noun knapweed; star thistle
Found on
https://www.encyclo.co.uk/local/20974

any of numerous composite plants of the genus Centaurea, having tubular flowers in a variety of colors. Cf. cornflower (def. 1),
Found on
https://www.infoplease.com/dictionary/centaurea
No exact match found.