Nemacaulis

{{Short description|Genus of flowering plants}}

{{Speciesbox

| image = Nemacaulis flower.jpg

| image_caption = Nemacaulis flower

| display_parents = 2

| genus = Nemacaulis

| parent_authority = Nutt.

| species = denudata

| authority = Nutt.

| synonyms = Eriogonum nemacaulis|

}}

Nemacaulis is a monotypic plant genus in the buckwheat family containing the single species Nemacaulis denudata, which is known by the common names woollyheads and cottonheads. This plant is a somewhat undistinguished delicate annual herb with thin, spindly, naked stems and woolly white flowerheads. It can be found in sandy habitats in California, Arizona, and northern Mexico.