Crocanthemum bicknellii (Fernald) Janch.
Family: Cistaceae
Bicknell's rock-rose, hoary frostweed, rock-rose
Crocanthemum bicknellii image
Marcie O'Connor  
Etymology: Helianthemum: from the Greek helios, "sun," and anthemon, "flower," because the flowers open only in the sun
Plants: erect, perennial, 8"-24" tall forb; stems clustered, branching when mature, the branches not becoming taller than the main stem
Leaves: wedge or triangular-shaped
Flowers: 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
Habitat: dry; prairies, woods, inland sands; in sandy soil
Conservation Status: Native