The santalaceae (sandalwood) family is a group of partly parasitic herbs, shrubs and trees. There are 65 species in the US (in 15 genera), some introduced; major native genera in the West are limited to arceuthobium, comandra and phoradendron. Leaves are undivided and lack stipules. Flowers are usually produced in small, elongated clusters at the top of the stem and from the upper leaf nodes. Flowers are formed of a calyx that opens to four or five petal-like lobes, centered on one style and four or five stamens.