Thelypodium howellii, the Howell's thelypody or Howell's thelypodium, is a rare plant of the Western United States. It is endemic to a relatively small area on the borders of three western States: Oregon, Nevada, and California.
Abronia alpina is a rare species of flowering plant in the four o'clock family known by the common names Ramshaw Meadows sand verbena and Ramshaw Meadows abronia. It is endemic to Tulare County, California, where it is known from only one area high in the Sierra Nevada.
Claytonia palustris is a species of wildflower in the family Montiaceae known by the common names Jonesville springbeauty and marsh claytonia. Often mistaken for Claytonia sibirica, the species is diploid with a chromosome base number of x = 6.
Laphamia inyoensis, known by the common names Inyo rockdaisy and Inyo laphamia, is a rare species of flowering plant in the aster family.
Phlox dolichantha is a species of phlox known by the common name Big Bear Valley phlox. It is endemic to San Bernardino County, California, where it is limited to the area around Big Bear Lake in the San Bernardino Mountains. It grows in forests and the unique local pebble plain habitat. It occurs at elevations over 2,000 meters (6,600 ft). It is an erect, branching perennial herb growing up to 30 centimeters (12 in) tall. The linear or narrowly lance-shaped leaves are 2 to 5 centimeters long and are oppositely arranged on the slender stems. The inflorescence is made up of one or more showy flowers at the tip of the stem. Each flower has a very slender tubular throat up to 5 centimeters (2.0 in) long which can be white, pink, or lavender.
Poa atropurpurea is a rare species of grass known by the common name San Bernardino bluegrass. It is endemic to southern California, where it is known from two regions, the San Bernardino Mountains near Big Bear and the Laguna Mountains of San Diego County.
Pyrrocoma uniflora is a species of flowering plant in the family Asteraceae known by the common name plantain goldenweed. It is native to western North America from central Canada to California to Colorado, where it grows in several types of habitat, including forest and meadows with alkali soils, such as those near hot springs. It is a perennial herb growing up to 40 centimeters tall, the stems reddish and usually with a thin to thick coating of woolly fibers. The lance-shaped, toothed leaves are usually woolly, the largest near the base of the plant reaching up to 12 centimeters in length. The inflorescence is a single flower head or a cluster of a few heads, each lined with woolly phyllaries. The head contains yellow disc and ray florets. The fruit is an achene which may be over a centimeter long including its long pappus.
Sedum stenopetalum, also known as wormleaf stonecrop or narrow-petaled stonecrop, is a species of flowering plant in the stonecrop family. It is native to western North America from British Columbia and Alberta to northern California to Wyoming. It can be found in many types of rocky habitat, such as cliffs, talus, and steep ridges. It is a succulent plant producing mats or clumps of lance-shaped, linear, or three-lobed leaves each under 2 centimeters long. The inflorescence is a short, erect array of one to many flowers with lance-shaped petals up to a centimeter long. The petals are yellow, sometimes with red veins.
Packera layneae, known by the common name Layne's ragwort and Layne's butterweed, is a rare species of flowering plant in the aster family.
Packera pseudaurea is a species of flowering plant in the aster family known by the common name falsegold groundsel. It is native to North America, where it can be found in western and central parts of Canada and the United States. It grows in mountain habitat such as meadows, streambanks, and woodlands.
Streptanthus breweri is a species of flowering plant in the mustard family known by the common name Brewer's jewelflower. It is endemic to California, where it can be found in the coastal mountain ranges from the Klamath Mountains south to the San Francisco Bay Area. Its habitat includes chaparral and woodlands, usually on serpentine soils. It is an annual herb producing an erect, branching stem up to about 80 centimeters in maximum height. It is hairless except for fine hairs on some of the inflorescence parts, and it may be waxy in texture. The basal leaves have oval blades borne on petioles, and the lance-shaped leaves farther up the stem clasp it at their bases. Flowers occur at intervals along the upper stem, sometimes in a zig-zagging, one-sided array. Each has an urn-shaped calyx of keeled greenish or purplish sepals under a centimeter long. White, purple, or purple-veined white petals emerge from the tip. The fruit is a narrow, curved silique which may be 9 to 11 centimeters in length.
Streptanthus gracilis is an uncommon species of flowering plant in the mustard family known by the common name alpine jewelflower.
Streptanthus howellii is an uncommon species of flowering plant in the mustard family known by the common name Howell's jewelflower.
Streptanthus longisiliquus is a species of flowering plant in the mustard family known by the common name long-fruit jewelflower. It was first described to science in 2007. It is endemic to northern California, where it is known from Butte, Tehama, and Shasta Counties. It can be found in forest and woodland habitat in mountains and foothills. It is a short-lived perennial herb producing a few-branched stem up to 1.2 to 1.5 meters in maximum height. It is mostly hairless except for some light hairs on the inflorescences and sometimes the leaf petioles. The basal leaves have oval or spoon-shaped blades up to 10 centimeters long, usually with smooth edges. Leaves higher on the stem are oval or oblong and lack petioles, their bases often clasping the stem. Flowers occur at intervals along the upper stem. Each flower has a bell-shaped calyx of sepals which yellow-green at the base and purplish at the tip, measuring under a centimeter in length. The petals emerging from the end are brownish or purplish with greenish bases. The fruit is a flattened, curving silique that can be quite long even for the genus, measuring up to 15 centimeters in length.
Thelypodium flexuosum is a species of flowering plant in the mustard family known by the common name nodding thelypody. It is native to the Great Basin and surrounding plateau habitat in the northwestern United States, from California and Nevada to Idaho.
Thelypodium laciniatum is a species of flowering plant in the mustard family known by the common name cutleaf thelypody. It is native to western North America, particularly the Great Basin and surrounding plateau and foothill habitat, where it grows on dry rocky cliffs and hillsides in sagebrush and scrub, usually below 2,400 metres (8,000 ft) elevation.
Thelypodium milleflorum is a species of flowering plant in the mustard family known by the common names manyflower thelypody and many-flowered thelypodium. It is native to western North America, particularly the Great Basin and surrounding plateau, desert, and foothill habitat, where it grows in sagebrush and scrub.
Boechera yorkii is a rare species of flowering plant in the mustard family known by the common name Last Chance rockcress. It is endemic to Inyo County, California, where it is known only from the Last Chance Range in Death Valley National Park. There are only two occurrences known, but the plant occurs in remote, nearly inaccessible mountain territory, so more plants may exist unobserved. The species was only described to science in 2004. Its habitat is rocky mountain canyons on cliffs of dolomite.
Warea amplexifolia is a rare species of flowering plant in the mustard family known by the common names wideleaf pinelandcress, wide-leaf warea, and clasping warea. It is endemic to Florida in the United States, where it is limited to a few counties in the central part of the peninsula. It is threatened by the loss and degradation of its habitat. It is a federally listed endangered species of the United States.
Thelypodium eucosmum is a species of flowering plant in the mustard family known by the common names arrow-leaf thelypody and world thelypody. It is endemic to Oregon in the United States, where it is known from Grant and Wheeler Counties. There are also historical records of the plant from Baker County.
