Flora of Wyoming

Aquilegia laramiensis is a species of flowering plant in the buttercup family known by the common name Laramie columbine. It is endemic to Wyoming in the United States, where it is known only from the Laramie Mountains. This rhizomatous perennial herb produces stems up to 25 centimeters (9.8 in) long. The leaves are compound, divided into leaflets. The nodding flowers have greenish white or lavender sepals up to 1.5 centimeters (0.59 in) in length. The cream-colored to lavender petals are up to 1.2 centimeters (0.47 in) long and have thick, hooked spurs. The fruit is a follicle up to 1.4

Agrostis rossiae, or Ross' bentgrass, is a species of perennial or annual grass that is endemic to the Firehole River drainage and Shoshone Geyser Basin of Yellowstone National Park. It is one of 3 endemic plants to the park.

Abronia ammophila, the Yellowstone sand verbena, or Wyoming sand verbena, is a flowering plant unique to Yellowstone National Park lakeshores and is endemic to the park. Part of the "Four o'clock" family (Nyctaginaceae), Abronia ammophila is best suited in sandy soils and lake shores. The presence of a sand verbena on the Yellowstone Plateau is surprising because of the high elevation of approximately 7,740 ft (2,360 m) and long, cold winters. Yellowstone sand verbena is a member of a New World plant family that typically lives in warmer climates such as deserts. The genus Abronia includes

Yermo xanthocephalus commonly known as the desert yellowhead is an American flowering plant endemic to southern Wyoming. It is the only member of the genus Yermo and was first described in 1991.

Physaria fremontii (syn. Lesquerella fremontii) is a species of flowering plant in the family Brassicaceae known by the common name Fremont's bladderpod. It is endemic to Wyoming in the United States, where it occurs only in and around the Wind River Range in Fremont County. This species is a perennial herb growing from a taproot and producing decumbent or prostrate stems up to 15 centimeters long. The basal leaves are up to four or five centimeters long with oval blades borne on petioles. Longer, narrower leaves occur along the stems. The flowers have four yellow petals and measure 6 to 8

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

Astragalus proimanthus is a species of flowering plant in the legume family known by the common name precocious milkvetch. It is a narrow endemic, occurring in an area of less than 320 acres near the town of McKinnon in southwestern Sweetwater County, Wyoming. It has four known populations, including one large population of more than 20,000 individuals, and is classified by NatureServe as G1 (critically imperiled) "because of extreme rarity".

Symphyotrichum molle (formerly Aster mollis) is a species of flowering plant in the aster family (Asteraceae) endemic to the Bighorn Mountains of Montana and Wyoming in the United States. Commonly known as soft aster, it is a perennial, herbaceous plant that ranges from 30 to 60 centimeters (12 to 24 inches) in height.

Oreocarya subcapitata is a species of flowering plant in the family Boraginaceae known by the common names Owl Creek miner's candle, Wallowa cat's eye, and Wallowa cryptantha. It is endemic to Wyoming in the United States, where it is limited to the Owl Creek and Bridger Mountains in Fremont County. There are three populations, with a total of about 38,000 individuals. This plant is a perennial herb forming a low silvery mat of hairy leaves. The stems are up to 15 centimeters tall. It blooms in "sparkling white forget-me-not flowers." This plant grows on barren, sandy and gravelly terrain on

Stephanomeria fluminea is a species of flowering plant in the family Asteraceae known by the common names Creekside wirelettuce or Teton wirelettuce.

Helianthus pumilus is a North American species of sunflower known by the common name little sunflower or bush sunflower. It is found in the western United States, primarily the Rocky Mountain region of Montana, Wyoming, and Colorado, with a few isolated populations in Utah and Idaho. Helianthus pumilus grows on dry rocky soil in the mountains and nearby plains. It is a perennial herb up to 100 cm (40 inches) tall. One plant usually produces 1–6 flower heads, each containing 8–13 yellow ray florets surrounding 30 or more yellow or brown disc florets.

Eritrichium howardii, or Howard's alpine forget-me-not, is a rare flowering plant found in the Rocky Mountains area, most notably in Wyoming and Montana. It is a light blue to purplish five-petaled flower with a yellow ring in the middle.

Cymopterus evertii is a species of flowering plant in the carrot family known by the common names Evert's springparsley and Evert's waferparsnip. It is native to Utah and Wyoming in the United States. This plant was first discovered in 1981 and described in 1986. It is a small perennial herb forming a low tuft of herbage from a branching caudex covered in the persistent bases of previous seasons' leaves. The leaves are up to 13 centimeters long and 1.6 wide. They are divided into many small sections. When crushed they smell like orange peels. The inflorescence is an umbel of tiny white

Aletes humilis is a species of flowering plant in the carrot family known by the common names Colorado aletes and Larimer aletes. It is native to Colorado in the United States; it is also known from Wyoming, but there are no recent collections there. As of December 2022, Plants of the World Online regarded Aletes as a synonym of Cymopterus, but did not provide a name in that genus for Aletes humilis, stating only that the name is a synonym. This plant forms a mound or cushion up to 10 centimeters tall by 20 wide. The thick, leathery, bright green leaves have toothed edges. The leaves have a

Xanthisma coloradoense (syn. Aster coloradoensis, Machaeranthera coloradoensis) is a species of flowering plant in the family Asteraceae known by the common name Colorado tansyaster. It is native to Colorado and Wyoming in the United States. This cushion plant is a perennial herb growing from a taproot and branching caudex. It grows up to 14 centimeters tall, with several to many thick, hairy stems. The hairy leaves are lance-shaped to spatula-shaped and the edges are lined with large, sharp teeth tipped with bristles. The inflorescence is a solitary flower head with narrow, white-tipped

Sisyrinchium pallidum, more commonly known as pale blue-eyed grass, is a species of blue-eyed grass in the iris family. It is a small plant that lacks woody parts and grows in constantly wet meadows and fens in the mountains of Colorado and Wyoming. It is a rare species and is vulnerable to development of its required habitat type.

Shoshonea is a monotypic genus of flowering plants belonging to the parsley family. Its native range is Western Central USA.

Penstemon virens, commonly known as blue mist penstemon, Front Range penstemon, or Green beardtongue, is a common Penstemon in the Front Range foothills in Colorado and Wyoming. The dainty flowers are an ornament to many rocky or sandy area within its range. It is confusingly similar to Penstemon humilis and Penstemon albertinus though the ranges of these plants do not overlap in the wild. The origin of calling it the "blue mist penstemon" is not precisely known, but is thought to relate to the large number of blue flowers the plant can produce reminding observers of a blue mist.

Penstemon haydenii, the blowout penstemon or blowout beardtongue, is a species of flowering plant in the genus Penstemon and the family Plantaginaceae. The warm-season perennial is native to nine counties in the Nebraska Sand Hills and a single location in Carbon County, Wyoming. The plant has a milky blue color with a waxy cuticle, pale purple leaves, and an alternating leaf pattern with one central stalk. The flowers, while in the inflorescence stage, originate from the bases of the leaves of the plant. Blowout penstemon flowers from May until early June and drops its seeds from late August

Penstemon cyathophorus, commonly known as cupped penstemon or Middle Park penstemon, is a species of flowering plant that grows in a small area in the mountains of northern Colorado and a smaller area of southern Wyoming. As a rare species with a limited range it is vulnerable to human development. It is not a large plant and is often found growing amid sagebrush plants in mountain basins and valleys.

Penstemon arenicola, commonly known as Red Desert penstemon, is a species of plant from the Western United States. It primarily grows in Wyoming, but it also grows in small areas of Colorado and Utah. It is a short plant known for growing in sand as referenced by its scientific name.

Eriogonum exilifolium is a species of flowering plant in the buckwheat family known by the common name dropleaf buckwheat. It is native to Wyoming and Colorado in the United States. This species is a mat-forming herb growing up to about 10 centimeters tall. The leaves, located around the base of the plant, are linear or lance-shaped and measure up to 6 centimeters long. They are white and woolly on the undersides but green and mostly hairless on the upper surfaces. The inflorescence is a cluster of white flowers. This species was long confused with Eriogonum pauciflorum, a more common

Erigeron allocotus is a species of flowering plant in the family Asteraceae known by the common name Bighorn fleabane. It has been found only in the Bighorn Mountains of north-central Wyoming and southern Montana. Erigeron allocotus is a short, branching shrub rarely more than 18 cm (7 inches) tall. Leaves are 3-lobed. The inflorescence generally consists of 2 or 3 flower heads per stem, each head with sometimes as many as 40 small yellow disc florets and surrounded by a ring of up to 40 white or blue ray florets.

Artemisia porteri is a species of flowering plant in the aster family known by the common names Porter's sagebrush, Porter's wormwood, and Porter mugwort. It is endemic to Wyoming in the United States, where it is known from Fremont, Johnson and Natrona Counties. This plant is a perennial herb or small subshrub, growing in clumps or mats up to 14 centimeters tall. There are several woolly stems with silvery lobed leaves. Bell-shaped woolly flower heads contain small yellowish disc florets. This plant grows in the badlands of central Wyoming. It can be found on substrates of mudstone and

Erigeron parryi is a species of flowering plant in the family Asteraceae known by the common name Parry's fleabane. It is native to the Rocky Mountains of southern Montana and northern Wyoming. Erigeron parryi is a small perennial herb rarely more than 15 centimeters (6 inches) tall, producing a woody taproot. The leaves are covered with wool. The plant generally produces only 1 flower head per stem, though occasionally 2 or 3. Each head has 20–40, pink, or blue ray florets surrounding numerous yellow disc florets. The plant grows on rocky limestone slopes, frequently alongside sagebrush.

Castilleja nivea, the snow paintbrush or snowy paintbrush, is a rare species of alpine plant from northern Wyoming and southern Montana.

Penstemon saxosorum, with the common name upland penstemon, is a species of plant from northwestern Colorado and southern Wyoming.

Mertensia humilis is a species of plant in the borage family that grows in areas of Wyoming and Colorado in the western United States. In 2023 the species was rated as vulnerable to extinction.

Grindelia subalpina, the subalpine gumweed, is a North American species of flowering plants in the Astereae tribe of the family Asteraceae.

Erigeron flabellifolius is a rare North American species of flowering plants in the family Asteraceae known by the common names fan-leaf fleabane . Erigeron flabellifolius is native to the mountains in the vicinity of Yellowstone National Park and Grand Teton National Park in Montana and Wyoming. It grows at high elevations on cliffs, rockslides, and alpine meadows. Erigeron flabellifolius is a tiny perennial herb rarely more than 8 centimeters (3.2 inches) in height. Most of the leaves are clustered around the base of the stems. They are fan-shaped, narrowed at the base, triangular or