Rosin weed

rosinweed

[roz-in-weed]
noun
1.
any coarse, North American, composite plant of the genus Silphium, having a resinous juice and stalkless, paired leaves.
2.
the compass plant, S. laciniatum.

Origin:
1825–35, Americanism; rosin + weed1

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World English Dictionary
rosinweed (ˈrɒzɪnˌwiːd)
 
n
any of several North American plants of the genus Silphium and related genera, esp the compass plant, having resinous juice, sticky foliage, and a strong smell: family Asteraceae (composites)

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