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Centaurea jacea L. nothosubsp. pratensis (W.D.J. Koch) Čelak. NATURALIZED Inflorescence: heads radiant (discoid); peduncle swollen below head or not; phyllary tip appendages +- scarious, light to dark brown, flat to +- concave, coarsely dentate to dissected into fine, wire-like lobes. Flower: disk flower corolla 15--22 mm. Fruit: pappus scales <= 1 mm, white or tan. Chromosomes: 2n=22, 44. Ecology: Grassland, disturbed places, montane forest; Elevation: 150--1100 m. Bioregional Distribution: NCoRO, CaR; Distribution Outside California: to southern Canada, eastern United States; native to Europe or locally derived from hybridization of parental taxa native to Europe. Flowering Time: Aug--Oct Note: Variable, outcrossing derivative of fertile hybrid (Centaurea jacea subsp. jacea × Centaurea jacea subsp. nigra). Populations show much pl-to-pl variation, often with some individuals approaching one or the other parental subsp. Synonyms: Centaurea ×moncktonii C.E. Britton; Centaurea ×pratensis Thuill., illeg. Jepson eFlora Author: Error CHECK eFlora Treatments Index of California Plant Names (ICPN; linked via the Jepson Online Interchange) Noxious Weed listed on the CDFA Weed Pest Ratings table View the CDFA Pest Rating page for Centaurea jacea nothosubsp. pratensis Weed listed by Cal-IPC Previous taxon: Centaurea jacea subsp. nigra Next taxon: Centaurea melitensis |