Genus of flowering plants
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 species, "Tetraneuris linearifolia", with all the other species being perennials.
The name is of Greek origin, deriving from "tetra", meaning "four", and "neuron", meaning "nerve", which refers to the venation of the rays: three-lobed with the outer lobes themselves having an apparent vein down the middle.
see "Hymenoxys" 
References.
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