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 bicknellii Fernald image
Photographer: Merel R. Black           

Marcie O'Connor

Merel R. Black
Family Cistaceae
Helianthemum bicknellii Fernald
Bicknell's rock-rose, hoary frostweed, rock-rose
Helianthemum: from the Greek helios, "sun," and anthemon, "flower," because the flowers open only in the sun
bicknellii: for Eugene Pintard Bicknell (1859-1925), businessman and amateur botanist from New York
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 clustered, branching when mature, the branches not becoming taller than the main stem
Flower: yellow, 5-parted, 2/3"-1" wide; inflorescence of 2-10 stalked flowers in a branched cluster (cyme) at the top of the stem; blooms June-July usually 2-3 weeks later than H. canadense
Leaf:wedge or triangular-shaped
Habitat: dry; prairies, woods, inland sands; in sandy soil
Notes: early morning moisture, driven up from the roots, can burst the stems causing a hoarfrost effect

More Information Natural Communities Herbarium Specimens
All Helianthemum list Google- Images or Text
Crocanthemum bicknellii (Fernald) Barnhart
Crocanthemum majus sensu Britton

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