Flora of Utah

Astragalus ampullarioides is a rare species of milkvetch known by the common name Shivwits milkvetch. It was previously classified as a variety of Astragalus eremiticus. It is endemic to Washington County, Utah, where it is known from only seven populations. Estimates of the total number of individuals range from 1000 to 4200. The species occurs in desert scrub and woodlands on the Chinle Formation. It is a federally listed endangered species. This is a perennial herb growing erect to a maximum height near half a meter. It produces about 45 flowers on an erect inflorescence. It is pollinated

Astragalus iselyi is a rare species of flowering plant in the legume family known by the common name Isely's milkvetch. It is endemic to Utah in the United States. This perennial herb grows up to 25 centimeters tall. It produces yellowish white flowers nearly 2 centimeters long. The fruit is an inflated, rough-haired legume pod up to 3.8 centimeters long. This plant occurs in three areas in southeastern Utah, two in San Juan County and one in Grand County. It is limited to soils originating from the Morrison and Mancos Formations, and possibly the Paradox Formation. The soils are clay rich in

Astragalus desereticus is a rare species of milkvetch known by the common name Deseret milkvetch. It is endemic to Utah County, Utah, where it is known from only one population. It was thought to be extinct until 1981 when this population was discovered. The population contains 5,000 to 10,000 plants on an area of land covering less than 300 acres. It is vulnerable to damage from grazing cattle, which eat the plant and trample the soil, and from development and erosion. This is a federally listed threatened species. This is a perennial herb with a short stem growing from a woody taproot and

Sclerocactus wrightiae is a rare species of cactus known by the common names Wright's little barrel cactus and Wright's fishhook cactus. Dr. Lyman Benson named this species for North American cactus expert Dorde Wright Woodruff, who initially discovered it in 1961 and brought it to the attention of Dr. Benson. Dr. Benson and Ms. Woodruff later collaborated in connection with other Sclerocactus taxa in the Intermountain West.

Astragalus limnocharis is a species of flowering plant in the family Fabaceae, endemic to Utah. It was first described by Rupert Charles Barneby in 1946.

Yucca sterilis is a species in the family Asparagaceae, native to the Uintah Basin region in Duchesne and Uintah Counties, Utah. It is closely related to Y. harrimaniae Trel. Yucca sterilis is an acaulescent (trunkless) species spreading by underground rhizomes. The inflorescence is up to 40 cm tall, with flowers white or sometimes tinged with violet along the edges of the tepals.

Sclerocactus wetlandicus is a rare species of cactus known by the common name Uinta Basin hookless cactus. It is endemic to Utah in the United States, where it is known only from the Uinta Basin. It may also be called the Pariette cactus, but this name is more appropriate for Sclerocactus brevispinus, the species endemic to the Pariette Draw of Duchesne County. Sclerocactus wetlandicus is threatened by a number of processes and human activities. This plant is federally listed as a threatened species of the United States. Until 1989 it was included under the description of Sclerocactus

Quercus welshii, the wavy leaf oak, shinnery oak, or Tucker oak, is a North American species of shrub in the (beech family) found in the Colorado Plateau and Canyonlands region of the southwestern United States.

Astragalus loanus is a rare species of flowering plant in the legume family known by the common name Glenwood milkvetch. It is endemic to Utah in the United States, where it occurs only in Sevier County. It is limited to volcanic gravel substrates. This perennial herb is just a few centimeters tall. It is stemless, with a caudex covered in the remains of previous seasons' leaves. The leaves are up to 8 centimeters long and are made up of several pairs of small leaflets. The flowers are yellowish or greenish white with purple tips. Blooming occurs in May and June. The fruit is an inflated

Allium passeyi is a plant species endemic to Box Elder County in northwestern Utah. It grows in shallow, stony locations at elevations of 1400–1600 m. Allium passeyi produces 2-3 round to egg-shaped bulbs, each up to 2 cm in diameter. Flowers are bell-shaped, up to 9 mm in diameter; tepals pink; pollen yellow.

Pediocactus bradyi subsp. winkleri, commonly known as Winkler's cactus or Winkler's pincushion cactus, is a small cactus endemic to the state of Utah in the United States. It is known only from Emery and Wayne Counties.

Astragalus woodruffii, also known as Woodruff's milkvetch, is a species of Milkvetch in the family Fabaceae. It is native to south central Utah.

Angelica wheeleri is a rare species of Angelica, a perennial herb in the Apiaceae (carrot) family, endemic to the state of Utah in the United States. The common names for A. wheeleri are Utah angelica or Wheeler's angelica. A. wheeleri was named by Sereno Watson in 1873. Angelica wheeleri can grow to 2 meters (6.5 feet) or taller, a distinguishing feature along with its primary opposite leaves. It has a hollow stem and white umbel flowers that bloom between June and August. These flowers produce small, dense, and hairy green fruits. These seeds are lime green and appear similar in shape to a

Aliciella caespitosa (syn. Gilia caespitosa) is a species of flowering plant in the phlox family known by the common names Rabbit Valley gilia and Wonderland Alice-flower. It is endemic to Utah, where it is known only from Wayne County. This perennial herb has a thick basal clump of sticky leaves growing just a few centimeters tall. The flowers are scarlet to blue-purple in color, sometimes fading maroon or purple. Flowering occurs in June and July, and seeds are produced in July and August. This species was collected in 1875 and not reported again for 90 years. There are about 6 populations

Viola frank-smithii is a rare species of Violet known by the common name Frank Smith's violet. It is endemic to Utah in the United States, where it is known only from Logan Canyon in the Bear River Range in Cache County. This perennial herb produces a stem few centimeters long, which is surrounded by the withered leaves of previous seasons and new leaves, which are heart-shaped. The flower is pale purple except for the lowest petal, which is greenish. Blooming occurs in May and June. This plant grows on vertical limestone cliffs, often in spots shaded by Douglas-fir (Pseudotsuga menziesii),

Sclerocactus brevispinus is a rare species of cactus known by the common name Pariette cactus. It is endemic to Utah in the United States, where it is known only from the Pariette Draw, a draw in Duchesne County. It is threatened by a number of processes and human activities.

Physaria tumulosa, known by the common name Kodachrome bladderpod, is a rare species of flowering plant in the family Brassicaceae. It is endemic to Utah in the United States, where it is known only from Kane County. There is only one known population of this plant, made up of scattered occurrences totaling about 20,000 individuals, all within the Kodachrome Basin. The plant is threatened by the loss and degradation of its habitat. It is federally listed as an endangered species. It was previously treated as a subspecies of Physaria hitchcockii. P. tumulosa is a perennial herb producing short

Phacelia argillacea is a rare species of flowering plant known by the common names clay phacelia and Atwood's phacelia. It is endemic to Utah in the United States, where it is known only from one canyon in Utah County. It is "one of Utah's most endangered species"; it is "one of the nation's rarest plants" and is federally listed as an endangered species of the United States. This plant is an annual herb growing up to 36 to 40 centimeters in height. It has a rosette of leaves around the base of the stem. The leaf blades are oblong with deep lobes along the edges, and measure up to 5

Lepidium barnebyanum is a rare species of flowering plant in the family Brassicaceae known by the common names Barneby's pepperweed, Barneby's pepper-grass, and Barneby's ridge-cress. It is endemic to Utah, where there is a single population in Duchesne County. It is a federally listed endangered species of the United States. This is a clumpy perennial herb with a woody caudex at the base layered with new leaves and the remains of previous seasons' leaves. The stems grow less than 20 centimeters tall. The leaves are linear in shape and one half centimeter to eight centimeters in length. Most

Hesperidanthus suffrutescens is a species of flowering plant in the mustard family. Its synonyms include Glaucocarpum suffrutescens. When placed in the genus Glaucocarpum, it was the only species. It is a rare species known by the common names toad-flax cress, shrubby reed-mustard, Uinta Basin waxfruit and waxfruit mustard. It is endemic to Utah in the United States, where it is known only from Duchesne and Uintah Counties. It is threatened by habitat degradation and destruction. It is federally listed as an endangered species of the United States.

Hesperidanthus barnebyi, syn. Schoenocrambe barnebyi, is a species of flowering plant in the mustard family, known by the common names Barneby reed-mustard, Syes Butte plainsmustard, and Barneby thelypody. It is endemic to Utah in the United States, where it is known only from Emery and Wayne Counties. It is threatened by habitat degradation and destruction. It is federally listed as an endangered species of the United States. This is a perennial herb with multiple erect stems growing 10 to 38 centimeters tall from a caudex. The leaves are oblong or oval in shape with smooth or slightly

Hesperidanthus argillaceus, syn. Schoenocrambe argillacea, is a species of flowering plant in the mustard family, known by the common names clay reed-mustard, Uinta Basin plainsmustard, and clay thelypody.

Erigeron maguirei is a species of flowering plant in the family Asteraceae known by the common names Maguire daisy and Maguire's fleabane. It is endemic to Utah in the United States. It is a perennial herb growing up to 28 centimetres (11 inches) tall. It grows from a taproot and a branching caudex. The stems are densely hairy. The inflorescence holds one to five flower heads each with several hairy, glandular phyllaries. The head has up to 20 white, pink-tinged, or pink ray florets 0.6 to 0.8 centimeters long, and many yellow disc florets at the center. This plant can be found in the San

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 burkei is a species of flowering plant in the family Brassicaceae known by the common names snowbasin draba and Burke's draba. It is endemic to Utah in the United States, where it is known from Box Elder, Cache, Morgan, and Weber Counties. This plant was considered a variety of Draba maguirei until 2004, when it was elevated to species status. This perennial herb has a branching caudex and forms clumps or mats. The stems are just a few centimeters long. The leaves are located on the caudex and in rosettes at the ends of the branches. The inflorescence is a raceme of up to 10 flowers

Arctomecon humilis is an endangered flowering plant species in the family Papaveraceae. It is endemic to the Dixie Corridor in southwest Utah. A. humilis grows in a very harsh desert environment, requiring a specific soil type. The plant's common name is dwarf bear-poppy, which is indicative of the plant's jagged, three “clawed” leaves. The poppy is a perennial plant, meaning it blooms annually. The dwarf bear-poppy is protected under the Endangered Species Act as of 1979. The plant is threatened by urban development, off-road vehicle use, and mining. Although hard to estimate, its population

Aliciella tenuis (syn. Gilia tenuis) is a rare species of flowering plant in the phlox family known by the common name Mussentuchit gilia, or Mussentuchit Creek gilia. It is endemic to Utah in the United States, where it occurs only in the San Rafael Swell. This plant is a perennial herb growing up to 15 centimeters tall. The basal leaves are divided into lobes. The herbage is coated in glandular hairs that often have sand stuck to them. The flowers are pale blue and appear in May through July. This species grows in rocky, sandy habitat, such as sandstone outcrops and talus slopes. The rare

Townsendia aprica is a rare species of flowering plant in the family Asteraceae known by the common name Last Chance Townsend daisy. It is endemic to Utah in the United States, where it is known from three counties. It faces a number of threats and it is a federally listed threatened species of the United States. This plant is a perennial herb forming a clump just a few centimeters wide and one or two centimeters tall. The rough-haired spatula-shaped leaves are generally under a centimeter long but may be slightly longer. The flower heads lie directly on top of the clump rather than erect on

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.

Penstemon pinorum is a rare species of flowering plant in the plantain family known by the common names Pine Valley penstemon and pinyon penstemon. It is endemic to Utah in the United States, where it is known only from an area along the border between Washington and Iron Counties. This plant was first described in 1985. It grows up to 21 centimeters tall, the stems arising from a woody caudex and fleshy root system. The lance-shaped leaves are up to 8 centimeters long and have wavy-toothed edges. The herbage is hairy. The inflorescence is a thyrse of flowers each about a centimeter long or