Helianthemum canadense (L.) Michx.
Longbranch Frostweed, Frostweed, Rock Frost, Frostplant, Frostwort
Cistaceae (Rock-Rose Family)
Synonym(s): Crocanthemum canadense, Helianthemum canadense var. sabulonum
USDA Symbol: HECA3
1 (rarely 2) showy, yellow-petaled flower atop main stem; later in season clusters of inconspicuous, bud-like flowers without petals in leaf axils.
This perennial of dry open sites flowers only in the sunlight, a fact that explains the genus name, which is derived from the Greek helios (the sun) and anthemon (flower). The common name refers to the ice crystals that form from sap exuding from cracks near the base of the stem in late fall. The flower lasts only one day and produces many seeds.
From the Image Gallery
Bloom InformationBloom Time: May , Jun , Jul
DistributionUSA: AL , CT , DC , DE , GA , IA , IL , IN , KY , MA , MD , ME , MI , MN , MO , NC , NH , NJ , NY , OH , PA , RI , SC , TN , VA , VT , WI , WV
Canada: NS , ON
Native Distribution: Ontario east to Nova Scotia, south to Georgia, west to Alabama, Kentucky, and Missouri, and north to Minnesota.
Native Habitat: Dry, sandy, or rocky, open woods and woodland openings.
BenefitConspicuous Flowers: yes
Additional resourcesUSDA: Find Helianthemum canadense in USDA Plants
FNA: Find Helianthemum canadense in the Flora of North America (if available)
Google: Search Google for Helianthemum canadense
MetadataRecord Modified: 2010-02-02
Research By: TWC Staff