Stanley Larson Welsh

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 anserinus, also called the Goose Creek milkvetch, is a member of the genus Astragalus that is listed as a candidate species under the Endangered Species Act. It grows in a 10-square-mile (26 km2) area of the Goose Watershed of the Upper Snake Basin in Idaho, Nevada and Utah.

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

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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.

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Cymopterus beckii is a rare species of flowering plant in the carrot family known by the common names featherleaf springparsley, Beck springparsley, and pinnate springparsley. It is native to Utah and Arizona in the United States. There are disjunct occurrences at Capitol Reef National Park and in the Abajo Mountains of San Juan County, Utah. It has also been reported from Navajo County, Arizona. This perennial herb grows from a taproot and reaches 40 centimeters tall. The leaves are divided into many subdivided segments, and the terminal leaflets are narrow and variable in size. The

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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

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Sphaeralcea gierischii, Gierisch's globemallow or Gierisch mallow, is an endangered species of flowering plant in the mallow family, Malvaceae. It is native to the western United States, where it is known only from Utah and Arizona. It was described in 2002.

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Mentzelia goodrichii is a rare species of flowering plant in the family Loasaceae known by the common name Goodrich's blazingstar. It is endemic to Utah in the United States, where it is known only from Duchesne County. This plant is a long-lived perennial herb forming clumps of branching, white stems up to about 30 centimeters tall. The inflorescence contains 1 to 3 flowers, each with 10 large yellow petals. Blooming occurs in July. This plant is known from five locations on the Badland Cliffs of northeastern Utah, where it grows on the white shale outcrops of the Green River Formation. It

Erigeron untermannii is a North American species of flowering plant in the family Asteraceae known by the common name Indian Canyon fleabane. It is native to the western United States, only in the state of Utah. Erigeron untermannii grows in sunny locations in sagebrush and in open coniferous woodlands. It is a small perennial herb rarely more than 8 centimeters (3.2 inches) tall, producing rhizomes and a branching underground caudex. The inflorescence is made up of only one flower heads per stem. Each head contains 14–30 white, pink, or purple ray florets surrounding numerous yellow disc

Erigeron canaani is a rare species of flowering plant in the family Asteraceae known by the common name Abajo fleabane. It has been found only in southern Utah, in sandy soil and in cracks on cliff faces in Washington, Kane, and San Juan Counties. Erigeron canaani is a perennial herb up to 30 cm (12 inches) tall, producing a taproot. One plant can produce several flower heads, sometimes one per branch, sometimes in groups of 2 or 3. Each head has 15–22 white or purpleray florets, plus numerous small yellow disc florets. The species is named for Canaan Mountain south of Zion National Park. The

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Penstemon franklinii, or Franklin penstemon, is a plant species endemic to Utah, United States, known only from Cedar Valley in Iron County. It grows in grasslands and in sagebrush communities.

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Montia bostockii, known by the common name Bostock's minerslettuce, is a species in the genus Montia found in Alaska and northwestern Canada.

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Heterotheca jonesii, known by the common name Jones's goldenaster, is a rare North American species of flowering plant in the family Asteraceae. It has been found in the southern part of the state of Utah in the United States.