Rhamnus diffusa
{{Short description|Species of plant}}
{{Speciesbox
| image = Rhamnus diffusa, Temuco, Araucania, Chile imported from iNaturalist photo 360588607.jpg
| image_caption =
| genus = Rhamnus
| species = diffusa
| authority = Clos
}}
Rhamnus diffusa, locally known as murta negra or palo negro,{{Cite journal |last=Rodriguez |first=Roberto |last2=Marticorena |first2=Clodomiro |last3=Alarcón |first3=Diego |last4=Baeza |first4=Carlos |last5=Cavieres |first5=Lohengrin |last6=Finot |first6=Víctor L. |last7=Fuentes |first7=Nicol |last8=Kiessling |first8=Andrea |last9=Mihoc |first9=Maritza |last10=Pauchard |first10=Aníbal |last11=Ruiz |first11=Eduardo |last12=Sanchez |first12=Paulina |last13=Marticorena |first13=Alicia |last14=Rodriguez |first14=Roberto |last15=Marticorena |first15=Clodomiro |date=2018 |title=Catalogue of the vascular plants of Chile |url=https://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432018000100001&lng=en&nrm=iso&tlng=en |journal=Gayana Botánica |volume=75 |issue=1 |pages=1–430 |doi=10.4067/S0717-66432018000100001 |issn=0717-6643}} is a species of flowering plant in the family Rhamnaceae.{{Cite web |title=Rhamnus diffusa Clos {{!}} Plants of the World Online {{!}} Kew Science |url=https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:718309-1 |access-date=2025-01-08 |website=Plants of the World Online |language=en}} It is endemic to Chile, where it is distributed between the Maule and the Los Rios regions.