About 370 species, both temperate and tropical, belong to the genus Hypericum. Aaron's-beard (H. calycinum; see photograph-->), sometimes known as rose of Sharon, and H. patulum are both shrubby, East Asian species. Aaron's-beard bears pale-yellow flowers with orange stamens, on 30-cm- (1-foot-) tall plants. The shrubby H. patulum has slightly smaller, deep-yellow flowers with darker stamens. H. elatum, from the Canary Islands, has egg-shaped, scarlet fruits. St.-Andrew's-cross (H. hypericoides) is cultivated as an ornamental shrub for its yellow flowers. The genus Cratoxylum, with six tropical Asian species, contains one garden plant, C. polyanthum. It is an aromatic shrub with pink flowers, papery oblong leaves, and winged seeds. H. perforatum has become a serious weed problem in southern Australia and North America; certain beetle species have been introduced in many locations to eat the plants and keep them under control. See also Saint-Andrew's-cross.