frostweed

[frawst-weed, frost-]
noun
  1. a plant, Helianthemum canadense, of the rockrose family, native to eastern North America, having narrow leaves and a solitary yellow flower.

Origin of frostweed

1830–40, Americanism; frost + weed1; so called from the ice crystals which form on it during the first frosts
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018