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Plants of disturbed ground, more often in shade, such as untended areas around buildings or near roadsides, vacant lots or waste places.  Flowers between June and September.  Not native.

Annual.  Fibrous-rooted.  Stems are usually solitary; sparsely to densely pubescentThe sap is milky white.  Typical height is 2 to 5 feet.

The overall inflorescence is open, consisting of a flat- to round-topped terminal inflorescence, and sometimes a few lateral,  branch inflorescences.

Flower heads are ligulate, with from 5-25 floretsFlorets are bisexual and fertile.  Corollas are yellow; 5-toothed.  Involucral bracts are in two series, the outer series much shorter than the inner series; bracts of the inner series are of equal length; glabrous and keeled (boat-shaped).

Basal leaves are usually deciduous by flowering.  Stem leaves are alternateLower leaves are irregularly lobed and toothed, on long, thin petioles, the terminal lobe the largest.  Upper leaves are much smaller, becoming ovate to lanceolate, toothed or untoothed, lacking petioles.

Cypselae are narrowly ovoid, slightly curved, light brown, and lack pappus.

Similar species:  Mycelis muralis.

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