butterfly weed

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Related to Asclepias tuberosa: Asclepias verticillata, Asclepias curassavica

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.

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.
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Asclepias tuberosa was not recorded in 2000, but two plants flowered in 2001 and ten other plants were noted growing in plots outside of the study site.
Asclepias tuberosa produced no flowers during the first growing season, but did so during the second year.
Species detail combined from CRP surveys, field emergence and Petri dish germination experiments CRP establishment Functional Species group Sown Not sown Asclepias tuberosa Forb 0.
We studied the pollination effectiveness of flower visitors to Asclepias tuberosa L.
We observed 80 species of visitors to Asclepias tuberosa flowers, including one hummingbird and 79 insects (Appendix).
Solidago speciosa and, perhaps, Asclepias tuberosa and Helianthus divaricatus.
In a well quantified southwest Michigan study (n = 1120 observations), Asclepias tuberosa, M punctata, Centaurea maculosa, Coreopsis lanceolata, Tephrosia virginiana, E.