1. 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
   - frostweed, frost-weed, frostwort, Helianthemum canadense

Type of: helianthemum, sun rose, sunrose

• Rhizobiaceae
• Rhizobium
• rhizoctinia
• rhizoctinia disease
• Rhizoctinia solani
• rhizoid
• rhizoidal
• rhizomatous
• rhizomatous begonia
• rhizome
• rhizomorph
• Rhizophora
• Rhizophora mangle
• Rhizophoraceae
• rhizopod
• Rhizopoda
• rhizopodan
• Rhizopogon
• Rhizopogon idahoensis
• Rhizopogonaceae
• rhizopus
• Rhizopus nigricans
• Rhizopus stolonifer
• rhizotomy
• rho