Robert W. Freckmann Herbarium


  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
(Glossary)

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

         
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