The carnation (or pink) family, caryophyllaceae, is a varied group of plants producing attractive flowers, borne singly or in small clusters. In the US, plants are mostly found in temperate regions of the west and north; there are 42 genera and around 350 species. Flowers have five sepals, often fused into a linear or inflated tube, and five (less commonly four) petals, often divided or fringed at the tip. The center of the flower contains five or ten stamens. Leaves are undivided, and oppositely arranged. They often have stipules at the attachment point. Stems are somewhat swollen at the leaf nodes.