The primrose family, primulaceae, is a medium sized group with 153 species in the US, in 18 genera, including dodecatheon, lysimachia, myrsine and primula. Most plants are herbs, quite leafy, producing attractive, bright-colored flowers, in clusters or singly. Leaves are usually undivided, but can be opposite, alternate or whorled, and may have edge teeth. Flowers show radial symmetry, and usually have five sepals, fused only at the base, five petals, and five stamens. In most species the petals are partly united into a five-lobed corolla. Some species have flowers with parts in fours rather than fives.