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Centaurea dubia Suter  
Go To Encyclopedia of Life...
Family: Asteraceae
Centaurea dubia image
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Vascular plants of NE US and adjacent Canada
Habitally like the next 2 spp.; invol 11-18 mm high, generally higher than broad, even as pressed; appendages of the invol bracts conspicuously blackish at least in part, 1-3 mm, the middle and outer ones deeply and rather regularly pectinate; marginal fls enlarged and ray-like; pappus mostly wanting; 2n=22, 24. Fields, roadsides, and waste places, now widely established in se. Can. and ne. U.S., s. to Va. and W.Va. July-Oct. (C. nigrescens; C. vochinensis)

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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Centaurea dubia
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The National Science Foundation
Developments of SEINet, Symbiota, and associated specimen databases have been supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)