Calycadenia villosa is an uncommon species of flowering plant in the family Asteraceae known by the common name dwarf western rosinweed.

It is endemic to central California, where it is known from a limited distribution in the Central Coast Ranges in Monterey County and San Luis Obispo County, with a few populations in Santa Barbara and western Fresno Counties.

[4][5][6] Calycadenia villosa is an annual herb producing a very hairy erect stem approaching 40 centimeters (16 inches) in height.

The inflorescence is made up of clusters of flower heads surrounded by gland-tipped bracts.

The fruit is an achene; those developing from disc florets bear a pappus of scales.