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)
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
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(25) The genus Centaurea has been the subject of many phytochemical and biological studies because of its widespread application in folk medicine to treat various diseases.
###***Taraxacum officinalis 11, Triticum vulgare 9, Carduus 5, Centaurea 4
The results also suggest that there is a choice on Asteraceae members on family level and especially a choice on the genera Onopordum, Echinops L, Carduus L, Centaurea L.
Bieb, Centaurea iberica Trev.ex Spreng, Conyza bonarensis (L.) Cronquist, Hertia intermedia Boiss, Echinops griffithianus Boiss, Seriphidium quettense (Podlech) Ling, Bull, Cousinia heterophylla Boiss, Lactuca persica Boiss, Pulicaria angustifolia DC and Sonchus asper L.
Nevertheless, the presence of species found in the pollen record such as Cotula, Xanthium and Centaurea, which are exotic in Southamerica may be considered indicators of anthropic environments.
The seasonal plants put on display included dragon flowers in various colours, chrysanthemum, marigold, pansy and species belonging to petunia, Centaurea and Larkspur families.
S'opposent de l'autre cote negatif les especes comprenant Stipa tenacissima (-1.37), une geophyte des milieux steppiques, soustendant l'axe, Echinaria capitata (-0.04), Dactylis glomerata (-0.27) et Centaurea melitentis (-1.80).
Trained dogs outperform human surveyors in the detection of rare spotted knapweed (Centaurea stoebe).--Invas.
Growth was minimal (mean shell heights < 10 mm and snail masses < 0.3 g), but significant in snails fed Helianthus annuus (Asteraceae) (t = 4.28; df = 4; P = 0.01), Portulaca oleracea (Portulacaceae) (t = 6.17; df = 3; P < 0.01), Centaurea cineraria (Asteraceae) (t = 7.15; df = 4; P < 0.01), Solenostemon scutellarioides (Lamiaceae) (t = 9.63; df = 4; P < 0.01), and Antirrhinum majus (Plantaginaceae) (t = 11.34; df = 3; P < 0.01).
Intermountain trials with pubescent wheatgrass (Elytrigia intermedia) seedings have also proven successful for preventing yellow starthistle (Centaurea solstitialis L.) invasion (Enloe et al.
No Niche Overlap between a Co-Occurring Native Dune Thistle (Cirsium pitcheri) and Non-Native Invader (Centaurea stoebe).