Clare Butterworth Hardham

Monardella stebbinsii is a rare species of flowering plant in the mint family known by the common names Feather River monardella and Stebbins' monardella. It is endemic to Plumas County, California, where it is known from only about ten occurrences along the North Fork of the Feather River in the High Sierra. It is a member of the serpentine soils flora in rocky mountain habitat.

Monardella siskiyouensis is an uncommon species of flowering plant in the mint family known by the common name Siskiyou monardella. It is endemic to the southern Klamath Mountains of California, where it grows in chaparral and woodland habitat.

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Systenotheca is a monotypic plant genus in the buckwheat family containing the single species Systenotheca vortriedei, which is known by the common name Vortriede's spineflower.

Chorizanthe blakleyi is a rare species of flowering plant in the buckwheat family known by the common name Blakley's spineflower. It is endemic to the Sierra Madre Mountains of Santa Barbara County, California, where it is known from only eight occurrences, four of which are within the bounds of the Los Padres National Forest. It grows only on north-facing slopes in chaparral and woodland habitat. This plant grows upright to no more than 15 centimeters tall. It is yellow-green and hairy, with a few basal leaves up to about 2 centimeters long. The inflorescence contains several flowers, each

Aristocapsa is a genus of plants in the family Polygonaceae with a single species, Aristocapsa insignis, restricted to California. It is known by the common names Indian Valley spineflower or Indian Valley spinecape, and it is endemic to the inland southern Coast Ranges of Monterey and San Luis Obispo Counties.

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