About Perideridia kelloggii (A.Gray) Mathias
Perideridia kelloggii is a species of flowering plant in the Apiaceae family, commonly known as Kellogg's yampah. This plant is endemic to California, where it occurs in the state's north and central coasts, the San Francisco Bay Area, and the Sierra Nevada foothills. It grows in grassland habitats, and can sometimes be found growing on serpentine soils. It is a perennial herb that can reach a maximum height of 1.5 meters (5 feet). Its slender, erect stem grows from a cluster of long, narrow, fibrous roots, each of which can grow up to 15 centimeters (6 inches) long. Leaves positioned near the base of the plant have blades up to 45 centimeters (18 inches) wide; these blades are divided into many leaflets, which are further subdivided into narrow, elongated lobes. The plant's inflorescence is a compound umbel made up of many spherical clusters of small white flowers. After flowering, the plant produces ribbed, oblong-shaped fruits, each measuring roughly half a centimeter long.
