knapweed

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Related to Centaurea: Centaurea solstitialis

knapweed

any of several plants of the genus Centaurea, having purplish thistle-like flowers: family Asteraceae (composites)
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Successful biological control of diffuse knapweed, Centaurea diffusa, in British Columbia, Canada.
Mummey and Rillig (2006) indicated significant AM community alterations and considerable reduction in their diversity in response to invasion by Centaurea maculosa invasion.
61 Anthemis tinctoria 1 Anthriscus sylvestris 1 A triplex prostrata 2 2 Brassica campestris 5 9 Capsella bursa pastoris 1 Centaurea cyanus 2 3 Cerastium arvense 3 Cerastium holosteoides 15 Chelidonium majus 38 Chenopodium album 69 479 544 Chenopodium glaucum 7 Erodium cicutarium 1 Fallopia convolvulus 8 31 Fumaria officinalis 2 Galeopsis ladanum 1 Galeopsis tetrahit/speciosa 9 25 Galium aparine 39 Galium spurium 1 Geranium pusillum 4 Lamium album 1 Lamium purpureum 1 Lapsana communis 2 Polygonum aviculare 29 Polygonum lapathifolium 12 237 Polygonum sp.
Ego non ad Corytianas coenas, ubi quandoque quasi digladiatum pugna plusquam Centaurea.
and Centaurea maculosa (Spotted knapweed), an introduced invasive species that has spread throughout North America using a GPS unit to map each plant population in 2007 and 2009 and at two locations on Beaver Island, Michigan.
7 Total number of species 50 92 Class Molinio-Arrhenatheretea Achillea millefolium 76 45 Centaurea jacea 52 60 Dactylis glomerata 52 23 Festuca pratensis 16 24 Lathyrus pratensis 28 49 Phleum pratense 12 8 Plantago lanceolata 56 14 Poa pratensis 36 31 Prunella vulgaris 4 13 Ranunculus acris 8 33 Trifolium pratense 28 12 Vicia cracca 56 63 Order Arrhenatheretalia Anthoxanthum odoratum 4 11 Galium album 52 45 Heracleum sibiricum 12 4 Leucanthemum vulgare 12 9 Lotus corniculatus 16 7 Order Molinietalia Angelica sylvestris .
Late Spring and Summer: Campanula, Nemophila, Eschscholzia, Clarkia, Gypsophila, Centaurea, Linum, Lavatera, Nigella, Limnanthes, Cosmos, Reseda, Phacelia, Coreopsis, Nepeta, Persicaria,
The seeds of the Centaurea scabiosa (Greater Knapweed), Dipsacus fullonum(Teasel) and Helianthus (Sunflower) are just a few pretty must haves too.