butterfly weed

WordReference Random House Unabridged Dictionary of American English © 2025

but′terfly weed′, 

1. Plant Biology Also called orange milkweed. a North American milkweed, Asclepias tuberosa, having clusters of bright orange flowers.
2. Plant Biology an erect North American plant, Gaura coccinea, of the evening primrose family, having wandlike spikes of white to pink flowers turning red with age.
• 1810–20, American.