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Tetraneuris, commonly known as four-nerve daisy or bitterweed, is a genus of North American plants in the sneezeweed tribe within the daisy family.
The genus includes one annual, Tetraneuris linearifolia, with all the other species being perennials.
The name is of Greek origin, tetra, four and neuron, nerve, referring to the venation of the rays, which are three-lobed with the outer lobes themselves having an apparent vein down the middle.
Species
Tetraneuris acaulis - western Canada, western USA, northern Mexico
