''Tetraneuris torreyana'' is a North American species of plants in the sunflower family, known by the common name Torrey's four-nerve daisy. It grows in the western United States, in extreme southern Montana, Arizona, New Mexico, Utah, Colorado, and Wyoming. ''Tetraneuris torreyana'' is a perennial herb up to tall. It forms a branching underground

caudex A caudex (plural: caudices) of a plant is a stem, but the term is also used to mean a rootstock and particularly a basal stem structure from which new growth arises.pages 456 and 695 In the strict sense of the term, meaning a stem, "caudex" is m ...

sometimes producing as many as 40 unbranched, above-ground stems. One plant can produce as many as 40 flower heads. Each head has 7–14 yellow ray flowers surrounding 25-150 yellow disc flowers.Flora of North America, ''Tetraneuris torreyana'' (Nuttall) Greene, 1898.
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References

torreyana Flora of the Western United States Endemic flora of the United States Plants described in 1841 Taxa named by Edward Lee Greene Taxa named by Thomas Nuttall Flora without expected TNC conservation status {{medicinal-plant-stub