Helianthemum apenninum, the white rock-rose, is a white-flowering rock rose found in dry grassy and rocky places across large parts of Europe. H. apenninum flowers from March to July, and may grow up to 50 cm tall. The flowers are pentamerous, up to 30 mm across, and are white with yellow centres and yellow stamens. The three outer sepals are hairy and striped; the 2 inner sepals are very small. The flowers grow in clusters of 3 to 10 on a stem.