silkweed

From silk +‎ weed.

silkweed (usually uncountable, plural silkweeds)

1. (botany) Any plant of the genus Asclepias whose seed vessels contain a long, silky down; milkweed.

• “silkweed”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.