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Photographer: Merel R. Black
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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
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| 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. |
| (Glossary) |
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 Michx.&phog=Derek Anderson&spcode=HELCAN)
 Michx.&phog=Kenneth J. Sytsma&spcode=HELCAN)
 Michx.&phog=Merel R. Black&spcode=HELCAN)
 Michx.&phog=Robert W. Freckmann&spcode=HELCAN)
