IUCN threat status:

Not evaluated

Comprehensive Description

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Description

This introduced plant is an annual about 1-2' tall that branches occasionally to frequently. The stems are light green, purplish green, or purple with fine longitudinal veins; they are glabrous and terete (round in cross-section). The alternate leaves are up to 3" long and 1½" across; they are green to dark green and double- or triple-pinnate. The leaves occur rather sparingly along the stems; they are sessile or have short petioles. The leaf segments are linear-filiform and glabrous. Each upper stem usually terminates in 1 or 2 daisy-like flowerheads. Each flowerhead spans about 1-2" across; it consists of 10-20 white ray florets that surround numerous yellow disk florets. The ray florets are oblong and petal-like; they spread outward or droop downward, depending on the maturity of the flowerhead. The tubular disk florets are arranged densely together on a receptacle that is globoid, subgloboid, or conical

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© John Hilty

Source: Illinois Wildflowers

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