Centaurea, Knapweed, Bluet

This is a relatively large genus with up to 600 species depending on your source. They are herbaceous perennials with thistle-like flowers. Most of them are native to areas in the Northern Hemisphere.


PGC-P-Centaurea-cyanus-2011-01
Centaurea americana Basketflower

C. babyloniea

Babylonian Centaurea
C. dealbata Persian Centaurea
C. cyanus Bachelor's Button, Cornflower, Bluebottle
C. gymnocarpa Dusty Miller, Velvet Centaurea
C. hypoleuca John Coutts Knapweed
C. imperialis Royal Centaurea annual
C. macrocephala Globe Centaurea
C. maculosa  
C. montana Mountain Bluet, Perennial Bachelor's Button, Mountain Knapweed
C. moschata Sweet Sultan
C. niqra  
C. pulthra  
C. ruthenica Ruthenian Centaurea
C. rutifolia Dusty Miller
C. simplicifolia Cornflower
 
Species Hgt
(ft)
Flower
Color
Flower
diameter
Color
(top)
C. dealbata 1-2 Lavender 2-3 Green
C. hypoleuca 1-1 Rose, pink 1-2 Gray-green
C. macrocephala 3-4 Yellow 3-3 Green
C. montana 1-2 Blue 1-2 Green
C. niqra 1-1 Violet 1-1 Green
C. pulthra 2-3 Pink 3-3 Gray-green

* Guides and Keys are from the book "Herbaceous Perennial Plants A Treatise on their Identification, Culture and Garden Attributes" by Dr Allan M. Armitage of the University of Georgia. Varsity Press, Athens, Georgia. 1989 ISBN 0-942375-00. More on Dr Armitage and his other books.

 

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