CARDUUS CINEREUS (ASTERACEAE) – NEW TO NORTH AMERICA

John F. Gaskin; Eric Coombs; Dean G. Kelch; David J. Keil; Mark Porter; Alfonso Susanna

doi:10.3120/0024-9637-66.4.142

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John F. Gaskin,¹ Eric Coombs,² Dean G. Kelch,³ David J. Keil,⁴ Mark Porter,⁵ Alfonso Susanna⁶

¹USDA ARS, 1500 North Central Avenue, Sidney, MT 59270 USA john.gaskin@ars.usda.gov
²870 S 2400 W, Logan, UT 84321 USA
³California Department of Food and Agriculture, 1220 N St., Sacramento, CA 95814 USA
⁴Biological Sciences Department, California Polytechnic State University, San Luis Obispo, CA 93405 USA
⁵Oregon Department of Agriculture, 401 NE 1st St., Suite 10, Enterprise, OR 97828 USA
⁶Botanic Institute of Barcelona (IBB, CSIC-ICUB), Passeig del Midgia s.n., Parc de Montjuïc, ES08038 Barcelona, Spain

Abstract

Carduus cinereus M.Bieb. populations have been discovered in the Hells Canyon Wilderness of northeastern Oregon and western Idaho. These plants were initially identified as C. pycnocephalus L. They are distinguished from that species by loosely clustered, usually pedunculate, heads and by scarious-margined phyllaries. These plants are genetically distant from other North American Carduus species (<94% similarity) based on DNA sequence comparisons of the internal transcribed spacers between the 18S and 26S nuclear rDNA regions. Carduus cinereus is new to North America. A revised key to the species of Carduus in North America is presented.

Citation Download Citation

John F. Gaskin, Eric Coombs, Dean G. Kelch, David J. Keil, Mark Porter, and Alfonso Susanna "CARDUUS CINEREUS (ASTERACEAE) – NEW TO NORTH AMERICA," Madroño 66(4), 142-147, (22 January 2020). https://doi.org/10.3120/0024-9637-66.4.142

Published: 22 January 2020

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