Hypericum undulatum var. boeticum Hypericum undulatum var. undulatum
Hypericum acutum subsp. undulatum Hypericum maculatum subsp. undulatum Hypericum quadrangulum var. undulatum Hypericum quadrangulum f. undulatum Hypericum quadrangulum subsp. undulatum Hypericum tetrapterum subsp. undulatum Hypericum tetrapterum var. undulatum Hypericum quadrangulum subsp. undulatum Hypericum acutum prol. undulatum Hypericum acutum var. undulatum
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024