Robert W. Freckmann Herbarium


Because of technology changes and personnel changes at UWSP and the Wisconsin State Herbarium, the database of plant species housed at this site was merged with the database from the OLD WisFlora website to create a new Flora of Wisconsin website at Currently we are encouraging all Wisplant viewers to begin using the Flora of Wisconsin website as soon as possible. Wisplants will remain operational through July 13th. After that date, all traffic to Wisplants will be redirected to the Flora of Wisconsin website.

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  Helianthemum canadense (L.) Michx. image
Photographer: Merel R. Black           

Derek Anderson

Kenneth J. Sytsma

Merel R. Black

Robert W. Freckmann
Family Cistaceae
Helianthemum canadense (L.) Michx.
common rock-rose, long-branch frostweed
Helianthemum: from the Greek helios, "sun," and anthemon, "flower," because the flowers open only in the sun
canadense: of or referring to Canada
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Native
Plant: erect, perennial, 8"-24" tall forb; stems scattered, branching when mature, the branches becoming taller than the main stem
Flower: yellow, 5-parted, 2/3"-1 1/8" wide; inflorescence of 1-2 flowers in a branched cluster (cyme) at the top of the stem; blooms May-June, usually 2-3 weeks earlier than H. bicknellii.
Leaf:alternate, narrowly-oblong, tapering at the base and tip
Habitat: dry; prairies, woods, inland sands
Notes: early morning moisture, driven up from the roots, bursts the stems causing a hoarfrost effect.

More Information Natural Communities Herbarium Specimens
All Helianthemum list Ethnobotany Information Google- Images or Text
Cistus canadensis L.
Crocanthemum canadense (L.) Britton
Helianthemum canadense (L.) Michx. var. sabulonum Fernald

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