Walter Knight

Arctostaphylos klamathensis, with the common name Klamath manzanita, is a species of manzanita. It is endemic to the Klamath Mountains of far northern California, where it was first described during an ecological survey in Cedar Basin near the border between Siskiyou and Trinity Counties in 1982.

Ceanothus roderickii is a rare species of shrub in the family Rhamnaceae known by the common name Pine Hill ceanothus. It is endemic to western El Dorado County, California, where it grows in the chaparral and woodlands of the Sierra Nevada foothills, such as the Pine Hill Ecological Reserve. It is named after 20th century California flora explorer, botanist, and arboretum director Wayne Roderick.

Arctostaphylos wellsii (common name Well's manzanita or Pismo manzanita) is a plant that grows at elevations between 90 and 1200 ft in San Luis Obispo county in California. The plant is an evergreen shrub native to chaparral and coniferous forests. Arctostaphylos wellsii is extremely rare and considered seriously endangered. Arctostaphylos wellsii can grow to six feet high and form very dense stands. The plant can stand high temperatures and drought but is sensitive to freezing weather. Arctostaphylos wellsii has smooth red stems gray foliage and white flowers.

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Arctostaphylos malloryi is a species of manzanita known by the common name Mallory's manzanita. It is endemic to California. The plant is native to the Inner North Coast Ranges west and northwest of the Sacramento Valley. It is a resident of the chaparral plant community, often on volcanic soils.

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