Plains coreopsis or calliopsis (Coreopsis tinctoria), is an annual forb. The small, slener seeds germinate in fall (overwintering as a low rosette) or early spring. Growing quickly, plants attain heights of 12 to 40 inches (30–100 cm). Leaves are pinnately-divided, glabrous and tending to thin at the top of the plant where numerous 1- to 1.5-inch (2.5-to 4-cm) flowers sit atop slender stems. Flowers are brilliant yellow with maroon or brown centers of various sizes. Flowering typically occurs in mid-summer.