Columbine in the open woods near my home in northeast Iowa. USA
Buttercup family (Ranunculaceae)
Description: This native perennial plant is 1-3’ tall and sparingly branched. The round stems are green to reddish green and glabrous or pubescent. At first, only basal leaves are produced, but later there are alternate leaves along the stems. These leaves are ternately compound (divided into groups of 3 leaflets) and they have long petioles that are glabrous or pubescent. Each leaflet is up to 3" long and 2" across; it is usually obovate in shape with a wedge-shaped bottom, but it divides into 3 rounded lobes. Each of these lobes is often subdivided into several secondary lobes, resembling large rounded teeth. The upper surface of each leaflet is glabrous and there may be areas with a whitish bloom. The leaflets can be sessile or stalked. The upper stems produce flowers individually or in groups of 2-3.
Each flower is about 1½" long and it hangs downward from a long stalk. This flower has 5 petals, 5 petal-like sepals, and strongly exerted stamens and styles. Each petal is yellow and rounded toward the tip, but its base consists of a long nectar spur that is pale red to purplish red. The sepals are ovate in shape and they are the same color as the nectar spurs. The nectar spurs of mature flowers are erect (parallel to each other) or slightly spreading. The anthers of the stamens are bright yellow. The blooming period occurs from late spring to early summer and lasts about a month. There is no floral scent. Each flower is replaced by 5 pod-shaped follicles that have long beaks. Each follicle splits open along one side to release the shiny black seeds. The root system is fibrous and rhizomes are occasionally produced.
Cultivation: The preference is light shade to partial sun, moist to dry conditions, and soil that is loamy, rocky, or slightly sandy. Mature plants can also tolerate full sun, although young plants require some shade from neighboring vegetation. Once it becomes established, this plant is easy to maintain.
Range & Habitat: Habitats include rocky open woodlands, wooded slopes, sandy savannas, thinly wooded bluffs, shaded areas of limestone cliffs, limestone glades, fens and bogs, openings in logged woodlands, and areas along railroad tracks. Occasional wildfires and other kinds of disturbance in wooded areas are probably beneficial in maintaining populations of this plant.