Oxytheca

{{Short description|Genus of flowering plants}}

{{Automatic taxobox

|image = Oxytheca perfoliata 2.jpg

|image_caption = Oxytheca perfoliata

|taxon = Oxytheca

|authority = Nutt.

|subdivision_ranks = Species

|subdivision = Oxytheca perfoliata

etc

}}

Oxytheca is a genus of plants in the family Polygonaceae with seven species found in dry and temperate parts of the Americas.{{Cite journal |last=Ertter |first=Barbara |date=1980 |title=A Revision of the Genus Oxytheca Nutt. (Polygonaceae) |url=https://www.jstor.org/stable/2806224 |journal=Brittonia |volume=32 |issue=1 |pages=70–102 |doi=10.2307/2806224 |jstor=2806224 |bibcode=1980Britt..32...70E |s2cid=85197917 |issn=0007-196X}} The taxonomy of this genus is in flux, with some species often listed under tentative new names.{{Cite journal |last=Parry |first=C. C. |date=1883 |title=A New Species of Oxytheca |url=https://www.jstor.org/stable/2476948 |journal=Bulletin of the Torrey Botanical Club |volume=10 |issue=2 |pages=23–24 |jstor=2476948 |issn=0040-9618}}

Species include:

• Oxytheca dendroidea
• Oxytheca parishii = Acanthoscyphus parishii
• Oxytheca perfoliata
• Oxytheca watsonii