Knoxia

{{Short description|Genus of plants}}

{{automatic taxobox

|image = Knoxia hookeriana 66801 580 360.jpg

|image_caption = Knoxia hookeriana

|display_parents = 2

|taxon = Knoxia

|authority = L.

|type_species = Knoxia zeylanica

|type_species_authority = L.

|synonyms = * Afroknoxia Verdc.

• Baumannia K.Schum.
• Cuncea Buch.-Ham. ex D.Don
• Dentillaria Kuntze
• Neobaumannia Hutch. & Dalziel
• Vissadali Adans.

}}

Knoxia is a genus of flowering plants in the family Rubiaceae. The genus is known to be a rich source of anthraquinones.{{cite journal|last1=Zhou|first1=Zhu|last2=Jiang|first2=Shan-Hao|last3=Zhu|first3=Da-Yuan|last4=Lin|first4=Long-Ze|last5=A Cordell|first5=Geoffrey|title=Anthraquinones from Knoxia valerianoides|journal=Phytochemistry|volume=36|issue=3|year=1994|pages=765–768|issn=0031-9422|doi=10.1016/S0031-9422(00)89813-1|bibcode=1994PChem..36..765Z }}