Reed C. Rollins

Dimorphocarpa is a genus of flowering plants belonging to the family Brassicaceae. Its native range is Western and Central USA to Northern Mexico. Species: Dimorphocarpa candicans (Raf.) Rollins Dimorphocarpa membranacea (Payson) Rollins Dimorphocarpa pinnatifida Rollins Dimorphocarpa wislizeni (Engelm.) Rollins

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Dimorphocarpa wislizeni, commonly known as spectacle pod, Wislizeni's spectaclepod, and touristplant, is a flowering plant in the mustard family native to western North America, where it occurs in the southwestern United States as far east as Oklahoma and Texas, and Baja California, Sonora, Chihuahua, and Coahuila in Mexico.

Cusickiella is a small genus containing two species of plants in the family Brassicaceae which are native to the western United States. These are mat-forming perennials with a stumpy, branching caudex covered in rounded clusters of tiny, thick leaves. A short stem bears white or yellowish flowers that yield silicles. The alkali cusickiella, Cusickiella douglasii, grows in the hills and mountains from California to Washington, Idaho, and Utah. It has white flowers and usually larger leaves, up to 14 millimeters long. The Bodie Hills cusickiella, Cusickiella quadricostata, has a more limited

Leavenworthia crassa is a species of flowering plant in the mustard family, Brassicaceae, known commonly as the fleshy-fruit gladecress. It is endemic to Alabama in the United States, where it occurs in only two counties. It is "likely one of the most imperiled plant species in the Southeast," and the United States Fish and Wildlife Service issued a final rule listing it as an endangered species in 2014.

Draba monoensis is an uncommon species of flowering plant in the mustard family known by the common names White Mountains draba and Mono draba. It is endemic to Mono County, California, where it grows in moist, rocky habitat in the alpine climate of the White Mountains.

Cardamine pachystigma is a species of Cardamine known by the common name serpentine bittercress. It is endemic to California, where it grows in rocky mountainous areas, often on serpentine and volcanic soils.

Cardamine micranthera is a rare species of flowering plant in the mustard family known by the common names small-anthered bittercress and streambank bittercress. It is endemic to the Piedmont region around the border between Virginia and North Carolina, and is today restricted to the Dan River watershed. It is in decline mainly because its habitat has been disturbed and destroyed by a number of processes. By the 1960s the only known populations of the plant had disappeared and in the 1970s it was feared extinct. The plant was rediscovered in the 1980s and for a while was presumed to be a rare

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Leavenworthia exigua, also known as the Tennessee gladecress, is a member of the mustard family. Tennessee gladecress is an annual plant that is native to southern United States. It is a fruit-bearing plant, with squarish leaves that fall off one the fruit is present and ripened. Tennessee gladecress is a beautiful plant during its blooming season, as it produces a light-lilac colored, small flower.

Leavenworthia alabamica is a species of flowering plant in the family Brassicaceae. It is commonly known as Alabama gladecress. It is endemic to Alabama.

Draba weberi is a species of flowering plant in the family Brassicaceae known by the common names Weber's whitlow-grass and Weber's draba. It is narrowly endemic to Summit and Park Counties, Colorado, where several populations were estimated to total to approximately 300 individuals as of 2012. D. weberi is principally threatened by alterations to its hydrologic environment, owing to its preference for wet, rocky streamside crevices. Draba weberi is a perennial herb which grows in small, dense tufts with pubescent stems 2 to 6 centimeters long. Flowering occurs from June to July, whereupon

Draba ramulosa is a rare species of flowering plant in the family Brassicaceae known by the common names Mt. Belknap draba and Tushar Mountain draba. It is endemic to Utah, where it is known only from Mt. Belknap in the Tushar Mountains in Beaver and Piute Counties. This small plant has creeping, hairy branches forming a mat of grayish herbage. The gray-green leaves are up to a centimeter long. The inflorescence is a raceme of up to 15 flowers. Each flower has pale yellow petals 3 or 4 millimeters long. Blooming occurs in June through August. The fruit is a flattened oval silique. This plant

Draba californica is a species of flowering plant in the family Brassicaceae, known as the California draba. This is an uncommon plant found at elevations over 3,000 metres (9,800 ft) in the Inyo Mountains of California and the nearby White Mountains of California and Nevada. Draba californica is a small perennial herb generally not exceeding 10 centimeters in height. It forms a clump of basal leaves and extends one or more erect stems, all of which is covered in a carpetlike coat of stiff, branching hairs. The stem is covered in inflorescences of many tiny white flowers and hairy fruit pods

Streptanthus oliganthus is an uncommon species of flowering plant in the mustard family known by the common name Masonic Mountain jewelflower. It is native to western Nevada and eastern California, where it grows in the rocky hills east of the central Sierra Nevada. Its habitat includes forest, woodland, sagebrush, and mountain talus. It is a rhizomatous perennial herb producing a hairless, waxy, usually unbranched stem up to about 40 or 50 centimeters in maximum height. The basal leaves have lance-shaped, smooth-edged blades up to 10 centimeters long borne on fuzzy to rough-haired petioles.

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Rorippa subumbellata is a rare species of flowering plant in the family Brassicaceae known by the common names Lake Tahoe yellowcress and Tahoe yellow cress. It is known only from the shores of Lake Tahoe, straddling the border between California and Nevada. There are an estimated fourteen populations of the plant still in existence. It grows only on the direct shoreline of the lake, occupying a seven-foot semi-aquatic zone between the high- and low-tide marks. It is directly impacted by recreational activities on the lake, enduring bombardment by boat wakes, trampling, and construction of

Physaria obcordata is a rare species of flowering plant in the family Brassicaceae known by the common name Dudley Bluffs twinpod. It is similar in appearance to the more common Piceance twinpod, but can be distinguished by looking at the leaves through a hand lens. The Piceance twinpod, Physaria acutifolia has stellate hairs when viewed through a hand lens while Physaria ocordata has markings that look like a satellite dish, or a circle with a dot in the middle. It is endemic to Colorado, where it is found only in the Piceance Basin in Rio Blanco County. It is threatened by the loss and

Physaria lepidota, the Kane County twinpod, is a plant species endemic to Utah. It is known only from Kane, Washington, and Garfield Counties in the southern part of the state. It grows on rocky slopes and outcrops, and sometimes in disturbed areas. Physaria lepidota is a perennial herb with most of the above-ground parts covered with a silvery pubescence. Stems branch at the base but rarely above, sometimes reaching a height of 20 cm (8 inches). Flowers are yellow, born in a dense raceme. Fruits are highly inflated, up to 20 mm (0.8 inches) across with purplish papery walls.

Physaria chambersii is a species of flowering plant in the family Brassicaceae known by the common name Chambers' twinpod. It is native to the southwestern United States, where it grows in desert woodland and plateau habitat. It is a perennial herb growing from a taproot and producing a clumpy rosette of stems up to 15 centimeters long, growing erect and falling over in fruit. The plant is covered in a silver-white coat of hairs. The leaves in the rosette are rounded to oval, up to 6 centimeters long by 2 wide, and smaller, spoon-shaped leaves are located along the stems. The inflorescence is

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Halimolobos jaegeri is a species of flowering plant in the family Brassicaceae known by the common names Mojave fissurewort, or Mojave halimolobos. It is native to the Mojave Desert and nearby mountain ranges of California and Nevada. It grows in rocky areas, such as the limestone cliffs and slopes of the desert mountains. This is a slightly woolly perennial plant growing many branching herbaceous stems to 20 to 60 centimeters in height. The slender erect stems bear occasional lobed, ruffled leaves up to 6 centimeters long. At the tips of stem branches are dense, fuzzy inflorescences of small

Draba subumbellata is a species of flowering plant in the family Brassicaceae known by several common names, including parasol draba, mound draba, and White Mountains cushion draba. This small perennial plant is native to the White Mountains which straddle the California-Nevada state line and the Inyo Mountains nearby. It lives on barren rocky scree above 3000 meters. This alpine-adapted plant forms cushion-like mats amongst the rock litter on mountain peaks. Its tiny leaves are covered in bushy hairs. At flowering small bunches of tiny buds open to reveal bright yellow petals each a few

Draba sharsmithii is an uncommon species of flowering plant in the family Brassicaceae known by the common names Mt. Whitney draba and Sharsmith's draba.

Draba incrassata is an uncommon species of flowering plant in the family Brassicaceae known by the common name Sweetwater Mountains draba. It is endemic to California, where it is known mainly from the Sweetwater Mountains of Mono County. It grows in alpine rock fields on the barren high mountain peaks. Draba incrassata is a small perennial herb forming mats of thick, oval-shaped leaves. Each leaf is under 1.5 centimeters long and mostly hairless except for a prominent fringe of long hairs along the edges. The erect inflorescence bears several flowers with yellow petals just a few millimeters

Descurainia torulosa is a species of flowering plant in the family Brassicaceae known by the common names Wyoming tansymustard and Wind River tansymustard. It is endemic to Wyoming in the United States, where it is found in the Absaroka Range and some buttes in the Great Divide Basin. This perennial or sometimes annual herb has hairy stems up to 15 centimeters long. The leaves are pinnate, divided into several lobes. The inflorescence is a raceme of flowers with yellowish sepals and four yellow petals. The fruit is a narrow silique which is torulose, or constricted between the seeds. Blooming

Caulanthus barnebyi, the Black Rock wild cabbage, is a plant species endemic to a small region in the US State of Nevada. It is known only from the Black Rock Mountains in Humboldt and Pershing Counties in the northwestern part of the state. It grows on dry, rocky slopes and outcrops at elevations of 4,300–4,900 feet (1,300–1,500 m). Caulanthus barnebyi is a glabrous, perennial herb up to 43 inches (110 cm) tall. It has basal leaves up to 6.3 inches (16 cm) long, plus smaller leaves higher up the stem. Flowers are in a dense raceme, with purple sepals and white petals.

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