butterfly weed

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butterfly weed

n.
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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

pleurisy root

An herbal root which contains glycosides—e.g., asclepiadin, resins, volatile oil; it is antispasmodic, diaphoretic, expectorant, tonic, carminative and mildly cathartic, and has been used by herbalists for respiratory tract infections.
 
Toxicity
Fresh roots may cause vomiting and toxicity at high doses.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
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