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Photographer: Merel R. Black
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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
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| 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 |
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