Valeriana macrocera is a species of flowering plant in the honeysuckle family known by the common names longhorn seablush and white plectritis.

It is native to California and Nevada in the western United States,[1] where it is a common plant in mountains, valleys, open steppe, and coastal habitat types.

It is an annual herb growing erect to a maximum height between 60 and 80 centimeters.

The inflorescence is a dense, cylindrical, headlike cluster of flowers in shades of pale pink to white.

The corolla is under a centimeter long and is divided into five lobes and a short, blunt spur.