IUCN threat status:

Not evaluated

Comprehensive Description

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Description

This native perennial plant is about 1½–3' tall, branching occasionally. The light green to tan stems are round and largely hairless. The opposite leaves are up to 6" long and 3½" across, becoming smaller as they ascend the stems. The lower leaves are cordate to cordate-ovate, while the upper leaves are broadly lanceolate to lanceolate. All of the leaves are largely hairless and strongly serrated along the margins. There are 3 prominent veins on the upper surface of each leaf (particularly the lower ones), while the lower surface has an elevated network of veins. The rather long petioles are ½–2½" in length. The upper stems terminate in compound corymbs of flowerheads that span several inches across. Each flowerhead is about ½" across and contains 10-30 disk florets that are brilliant white. There are no ray florets. Each disk floret is about 1/5" across when fully open; it consists of a small tubular corolla with 5 lobes that are spreading and pointed, and it has a divided style that is strongly exerted from the corolla. At the base of each flowerhead, there is a single series of linear floral bracts that are green and non-overlapping. The blooming period occurs from late summer through the fall and lasts about 2 months. This is one of the last wildflowers to bloom during the fall. The flowers are often fragrant. Each disk floret is replaced by a dark linear achene with a small tuft of white hairs. These achenes are distributed by the wind. The root system consists of spreading rhizomes and shallow fibrous roots. This plant can spread vegetatively by means of its rhizome, or it can reseed itself into new areas.

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Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© John Hilty

Source: Illinois Wildflowers

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