Oenothera fruticosa
Encyclopedia
Oenothera fruticosa, or Narrow-Leaved Sundrops, is an erect herbaceous
Herbaceous
A herbaceous plant is a plant that has leaves and stems that die down at the end of the growing season to the soil level. They have no persistent woody stem above ground...

 flowering plant
Flowering plant
The flowering plants , also known as Angiospermae or Magnoliophyta, are the most diverse group of land plants. Angiosperms are seed-producing plants like the gymnosperms and can be distinguished from the gymnosperms by a series of synapomorphies...

. It is native to much of eastern North America. It grows to about 2-9 decimeters tall, with alternative, simple, entire or slightly toothed leaves. The fruit is a capsule that is strongly 4-angled or winged and shaped like a club.
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