IUCN threat status:

Not evaluated

Comprehensive Description

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This adventive annual plant is about 3-12" tall, branching frequently and having the appearance of a miniature bush. Fern-like leaves up to 2" long and ¾" across alternate along the hairless stems. These simple, double, or triple compound leaves are pinnately divided into linear lobes. From the axils of the upper leaves, there develops flowerheads on stalks about ½–1½" long. The flowerhead of each stalk is about 1/3" across, and consists of numerous greenish yellow disk florets and no ray florets. Each disk floret has 4 tiny lobes at its apex. The base of the flowerhead has several overlapping green bracts that are lanceolate or ovate with papery upper margins. The top of the flowerhead is shaped like a dome or blunt cone. Both the foliage and flowerheads have a pineapple-like odor when they are bruised or crushed. The blooming period occurs during the summer and lasts about 1-2 months. Each disk floret is replaced by an oblong achene that is broader at the top than the bottom. The achenes are without awns or tufts of hairs. The root system consists of a branching taproot. This plant spreads by reseeding itself. Cultivation


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

© John Hilty

Source: Illinois Wildflowers


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