Williamsoniaceae

{{Short description|Extinct family of plants}}

{{Automatic taxobox

| fossil_range = {{fossil range|Triassic|Cretaceous}}

| image = Williamsonia life restoration.png

| image_caption = Restoration of Wielandiella

| image2 = Weltrichia diagram.png

| image2_caption = Diagram of Weltrichia, a male reproductive structure

| taxon = Williamsoniaceae

| authority = (Carruthers) Nathorst, 1913

| subdivision_ranks = Genera

| subdivision = *Zamites (leaf, in partim)

• Anomozamites (leaf)
• Ischnophyton
• Kimuriella (whole plant)
• Pterophyllum (leaf)
• Otozamites (leaf)
• Wielandiella (whole plant)
• Williamsonia (female reproductive structure)
• Williamsoniella (bisexual reproductive structure)
• Weltrichia (male reproductive structure)
• Bucklandia (axes)
• Bennettistemon (male pollen organ)
• Vardekloeftia (female seed cone)

}}

Williamsoniaceae is a family within the Bennettitales, an extinct group of seed plants. Members of this family are believed to have been around two meters tall and with widely serrate leaves along a central stem. Reproductive organs of the Williamsoniaceae have varied widely in the fossil record but almost all have been found to be borne on stalks emerging from a ring of leaves.

File:Pterophyllum_fossil_from_Shamshak_Formation,_Middle_Jurassic,_Iran.jpg fossil from Shamshak Formation, Middle Jurassic, Iran]]