[MAIPC] Looking for info on Centaurea depressa - low cornflower, Indian knapweed

[Muth, Norris (MUTH)]

Tony,
I am unfamiliar with this species – and looking it up it looks like it could be very easily mistaken for Centaurea cyanus. Is that right? I wonder if it would be worth anyone’s time to look through records of C. cyanus on iNaturalist, EDDMapS, or Imapinvasives. If there’s a quick reliable way to tell them apart I could probably train some students to do it and go through some of those records.

—

Norris Z. Muth, Ph.D.

Associate Professor, Biology

Office: 814-641-3632 | 1054 VLB

Juniata College

1700 Moore Street

Huntingdon, PA 16652

muthlab.org<http://muthlab.org> | NativePlantAdvocate.org<http://NativePlantAdvocate.org>


From: <Koop>, Anthony L - APHIS <Anthony.L.Koop at aphis.usda.gov<mailto:Anthony.L.Koop at aphis.usda.gov>>
Date: Tuesday, July 24, 2018 at 8:40 AM
To: "maipc at lists.maipc.org<mailto:maipc at lists.maipc.org>" <maipc at lists.maipc.org<mailto:maipc at lists.maipc.org>>
Subject: [MAIPC] Looking for info on Centaurea depressa - low cornflower, Indian knapweed

Hi all,

I am currently doing a weed evaluation on Centarua depressa. USDA-GRIN says it is naturalized in Nevada and Maryland, and BONAP has both of those states in blue. The Flora of North America reports it is introduced in these two states; noting that FNA did not use the word “established” I am guessing that this species is probably casual in the U.S. The Maryland Plant Atlas reports it as a waif for the state.

I wanted to see if anyone has seen it.

Thank you,

Tony


Anthony L. Koop  (Plant Ecologist)
Plant Epidemiology and Risk Analysis Laboratory
Center for Plant Health Science and Technology
USDA - APHIS - PPQ

North Carolina State University
1730 Varsity Drive, Suite 300
Raleigh, NC 27606-5202

Phone: (919) 855-7429
Fax:      (919) 855-7599
Email:  anthony.l.koop at aphis.usda.gov<mailto:anthony.l.koop at aphis.usda.gov>

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