butterfly weedn. A North American milkweed (Asclepias tuberosa) having showy clusters of usually bright orange flowers and a root that was formerly used in medicine. Also called pleurisy root.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.butterfly weed n (Plants) a North American asclepiadaceous plant, Asclepias tuberosa (or A. decumbens), having flat-topped clusters of bright orange flowers. Also called: orange milkweed or pleurisy root Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
white root
pleurisy rootn. See butterfly weed.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.pleurisy root n 1. (Plants) the root of the butterfly weed, formerly used as a cure for pleurisy 2. (Plants) another name for butterfly weed Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014