Willis Linn Jepson

Salvia apiana, the Californian white sage, bee sage, or sacred sage is an evergreen perennial shrub that is native to the southwestern United States and northwestern Mexico, found mainly in the coastal sage scrub habitat of Southern California and Baja California, on the western edges of the Mojave and Sonoran deserts.

Quercus durata, commonly known as leather oak, is a species of oak in the white oak group (subgenus Quercus, section Quercus). The common name "leather oak" is derived from the leathery texture on the lop of its leaves. It is endemic to California, common in the Coast Ranges and the foothills of the Sierra Nevada. It is found nearly exclusively on serpentine soil.

Hesperocyparis sargentii is a species of conifer in the family Cupressaceae known by the common name Sargent's cypress. It is endemic to California, where it is known from Mendocino County southwards to Santa Barbara County. This taxon is limited to the Coast Range mountains. It grows in forests with other conifers, as well as chaparral and other local mountain habitat, usually in pure stands on serpentine soils. It generally grows 10 to 15 meters (33 to 49 ft) tall, but it is known to exceed 22 meters (72 feet). On Carson Ridge in Marin County, as well as Hood Mountain in Sonoma County, the

Hesperocyparis bakeri, previously known Cupressus bakeri, with the common names Baker cypress, Modoc cypress, or Siskiyou cypress, is a rare species of western cypress tree endemic to a small area across far northern California and extreme southwestern Oregon, in the western United States.

Asclepias cordifolia is a species of milkweed commonly called heart-leaf milkweed or purple milkweed (a common name shared with another milkweed, Asclepias purpurascens). It is native to the western United States (California, Nevada, Oregon), growing between 50 and 2,000 m (160 and 6,560 ft) elevation in the northern Sierra Nevada and Cascade ranges. Heart-leaf milkweed was valued by the Native American Miwok tribe for its stems, which they dried and processed into string and rope.

Astragalus claranus (orth. var. A. clarianus) is a rare species of milkvetch known by the common names Clara Hunt's milkvetch and Napa milkvetch. It is endemic to northern California where it is known from only four or five occurrences along the border between Sonoma and Napa Counties. It is a federally listed endangered species.

Salvia eremostachya, the rose sage, sand sage, or Californian desert sage, is a perennial shrub native to the western edge of the Colorado Desert. It reaches 2 to 3 ft (0.61 to 0.91 m) high, with purplish green bracts on .75 in (1.9 cm) flowers that range from blue to rose to nearly white. The flowers grow in whorled clusters, blooming from April to November. The specific epithet, "eremostachya" (Greek for "desert stachys"), refers to the plants likeness to those of the genus Stachys.

Oreonana is a small genus of flowering plants in the carrot family known generally as mountainparsleys. All three species are endemic to high mountain ranges in California. They are petite, cushionlike mat-forming perennial herbs. As of December 2022, the Germplasm Resources Information Network considered that it may be a synonym of Cymopterus. Species: Oreonana clementis - pygmy mountainparsley Oreonana purpurascens - purple mountainparsley Oreonana vestita - woolly mounainparsley

Eryngium aristulatum, known by the common names California eryngo and Jepson's button celery, is a species of flowering plant in the family Apiaceae.

Mohavea confertiflora, the ghost flower, is a plant of the family Plantaginaceae. It is a native of the Southwestern United States, southern California, and three states of northwest Mexico. It is found growing in the arid conditions of the Mojave Desert and the Sonoran Desert (including Colorado Desert), below 1,000 metres (3,300 ft) in elevation. It also grows in those deserts' sky islands habitats.

Madieae is a tribe of flowering plants in the family Asteraceae. It is sometimes considered a subtribe of Heliantheae. Notable species include the tarweeds of the Western United States as well as the silverswords of Hawaii.

Cirsium fontinale, the fountain thistle, is a flowering perennial herb in the family Asteraceae. It is endemic to California. The genus Cirsium is commonly known as the "thistle" genus, Cirsium being the Greek word for 'thistle.'

Brodiaea coronaria is the type species of Brodiaea and also known by the common names harvest brodiaea and crown brodiaea. It is native to western North America from British Columbia to northern California, where it grows in mountains and grasslands.

Acanthomintha obovata is a species of flowering plant in the mint family known by the common name San Benito thornmint. It is endemic to California, where it grows in the woodland and chaparral of the coastal mountain ranges in the central part of the state.

Nemacladus glanduliferus is a species of flowering plant in the bellflower family known by the common name glandular threadplant. It is native to the southwestern United States and Baja California, where it grows in desert and plateau habitat. It is an annual herb producing a purplish or brownish green, branching stem up to about 25 centimeters tall. Small oval leaves occur at the base of the plant. The inflorescence is a series of zigzagging branches bearing occasional flowers on thin, erect pedicels. There is a single small bract at the base of each pedicel. The flower at the curved tip of

Monardella viridis is an uncommon species of flowering plant in the mint family which is endemic to California.

Berberis dictyota, now reclassified as Berberis aquifolium var. dictyota, with the common names Jepson's oregon grape and shining netvein barberry, is a flowering plant in the Barberry family.

Atriplex cordulata is a species of saltbush known by the common names heartscale and heart-leaf orache. It is endemic to the Central Valley and its San Joaquin Valley of California, where it grows in areas of saline and alkaline soils.

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Arctostaphylos silvicola is a species of manzanita known by the common names Bonny Doon or silverleaf manzanita. It is endemic to the sandhills of the southern Santa Cruz Mountains in California's Santa Cruz and Santa Clara counties.

Arctostaphylos rudis, with the common names shagbark manzanita and sand mesa manzanita, is a species of manzanita.

Arctostaphylos pilosula is a species of manzanita, known by the common names La Panza manzanita and Santa Margarita manzanita, that is endemic to California. Its common names comes from populations on the La Panza Range, near the town of Santa Margarita.

Trichostema simulatum is a species of flowering plant in the mint family known by the common name Siskiyou bluecurls. It is found n the western United States, where it is native to the southern Cascade Range in northern California and southern Oregon, and in the northern Sierra Nevada of California. It grows in open and generally sandy or gravelly sites of Yellow pine forests and adjacent habitats, at 500–1,600 metres (1,600–5,200 ft) in elevation.

Lomatium rigidum is a species of flowering plant in the carrot family known by the common names Big Pine biscuitroot and stiff lomatium. It is endemic to Inyo County, California, where it is known only from the wilderness around the Big Pine area of the Owens Valley.

Lomatium parvifolium is an uncommon species of flowering plant in the carrot family known by the common names coastal biscuitroot and small-leaved lomatium. It is endemic to California, where it is known only from the Central Coast and central California Coast Ranges. It grows in pine forests and other habitat on serpentine soils.

Lomatium lucidum is a species of flowering plant in the carrot family known by the common name shiny biscuitroot. It is native to coastal mountains and canyons of southern California and Baja California, where it is a member of the chaparral plant community, including recently burned areas. It is found in the eastern Transverse Ranges and the South Coast region.

Lomatium howellii is an uncommon species of flowering plant in the carrot family known by the common name Howell's biscuitroot, or Howell's lomatium. It is native to the Klamath Mountains of southern Oregon and northern California, where it is a member of the local serpentine soils flora.

Leptosiphon ciliatus (syn. Linanthus ciliatus) is a species of flowering plant in the phlox family known by the common name whiskerbrush.

Leptosiphon acicularis (syn. Linanthus acicularis) is a species of flowering plant in the phlox family known by the common names bristly linanthus and bristly leptosiphon.

Eriogonum latens is a species of wild buckwheat known by the common name Inyo buckwheat. It is native to the western Great Basin region, in the eastern slopes of the Sierra Nevada and the Inyo Mountains of California and the White Mountains, which extend just into western Nevada. It is an uncommon member of the flora in the sagebrush and woodlands of these mountains, where it grows in granitic sandy soils.