The Collaborative International Dictionary
Trumpetweed
Trumpetweed \Trump"et*weed`\, n. (Bot.)
An herbaceous composite plant ( Eupatorium purpureum), often having hollow stems, and bearing purplish flowers in small corymbed heads.
The sea trumpet.
Wiktionary
trumpetweed
n. 1 Any of the joe-pye weeds, herbaceous composite plants of genus ''Eutrochium'', often having hollow stems, bearing purplish flowers in small corymbed heads, native to eastern North America. 2 The sea trumpet.