So-called because ice crystals form on it during first frosts

• The eastern United States
• Perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers
• Tall perennial herb having clusters of white flowers

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Frostweed \Frost"weed`\, n. (Bot.) An American species of rockrose ( Helianthemum Canadense ), sometimes used in medicine as an astringent or aromatic tonic. Note: It has large yellow flowers which are often sterile, and later it has abundant but inconspicuous ...

Wiktionary Word definitions in Wiktionary
n. (context botany English) An American species of (vern: rock rose), (taxlink Helianthemum canadense species noshow=1), with large yellow flowers.

Wikipedia Word definitions in Wikipedia
Frostweed is a common name for several plants and may refer to: Helianthemum , in the Cistaceae family Verbesina virginica in the Asteraceae family

WordNet Word definitions in WordNet
n. perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; so-called because ice crystals form on it during first frosts [syn: frost-weed , frostwort , Helianthemum canadense , Crocanthemum canadensei ...