Oenothera laciniata (weed)

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Oenothera laciniata (click on image to enlarge it)
Author(s): Forest & Kim Starr
Source: Wikimedia Commons

Oenothera laciniata (weed) Hill - (cutleaf evening primrose)

This plant is believed to be native to eastern and central parts of North America, but is now widely distributed around the world. It is found in disturbed habitats and agricultural fields, affecting vegetables, orchards or crops like cotton.

The plant grows to a height of up to 1 m and has elliptic leaves, bright yellow flowers and a taproot. It is similar to Oenothera biennis, but has lobed ("cutleaf") or toothed leaf margins.