Flora of Oregon

Fritillaria gentneri, or Gentner's fritillary, is a rare species of flowering plant in the lily family Liliaceae, that is endemic to southwest Oregon and adjacent Siskiyou County, California, USA. Its habitat is dry, open woodlands and chaparral at 1,000–5,000 ft (300–1,520 m), where it blooms from March through July. However, most populations have generally finished blooming by the end of May. As with many plants, the lower elevations bloom earliest with the bloom period moving up following elevation.

Kalmiopsis is a small genus of flowering plants in the family Ericaceae.

Kalmiopsis leachiana, commonly referred to as Siskiyou kalmiopsis, is a rare flowering plant endemic to the Siskiyou Mountains of southwest Oregon, where it is specially protected in the 179,755-acre (727.4 km2) Kalmiopsis Wilderness reserve. It was discovered in 1930 by Lilla Leach in the Gold Basin area. It is related to Kalmia in the family Ericaceae.

Erythronium elegans is a rare species of flowering plant in the lily family known by the common names Coast Range fawnlily and elegant fawnlily. It is endemic to Oregon in the United States, where it is known from about 12 occurrences in the northern Coast Range. This plant grows from a slender bulb 3 to 5 centimeters long. It produces two leaves up to 20 centimeters long which are green, sometimes with brownish or white mottling. The scape grows up to 30 centimeters tall and bears one to four flowers. The flower has six tepals, the inner three white and the outer three white tinged with

Camassia howellii, commonly known as Howell's camas, is a species of perennial flowering plant in the family Asparagaceae endemic to western Oregon. Discovered in 1889, Camassia howellii is now considered to be imperiled due to residential development, mining and grazing.

Astragalus tyghensis is a species of flowering plant in the legume family known by the common name Tygh Valley milkvetch. It is endemic to Oregon in the United States, where it is known only from the Tygh Valley of Wasco County. This species is a perennial herb growing from a stout taproot and a branching caudex. The plant forms mats or clumps, with stems growing prostrate or upright and up to 55 centimeters long. Most of the plant is covered in long, silky hairs. The leaves are divided into a number of leaflets each up to 1.7 centimeters long. The inflorescence is a raceme of up to 40

Arabis aculeolata is a species of flowering plant in the mustard family known by the common name Waldo rockcress.

Pleuropogon oregonus is a species of grass known by the common name Anyastum Grass ('on-ya-st-uhm'). It is endemic to Oregon in the United States, where there are only two populations. It has been called "one of the rarest grasses in North America."

Plagiobothrys hirtus, the rough popcornflower, is a plant species with only about a dozen reportedly extant occurrences, all within the Umpqua River watershed in Douglas County, Oregon. It is federally listed endangered in the United States of America. In fact P. hirtus is now considered to be one of the top three most endangered vascular plant species in the Northwest. The state of Oregon has ranked this plant as its number one recovery priority due to its high degree of threat as well as its high rating in recovery potential. Its recovery depends on conservation of existing populations as

Perideridia erythrorhiza is a rare species of flowering plant in the family Apiaceae known by the common names western yampah and redroot yampah. It is endemic to Oregon in the United States, where there are about 20 occurrences. The populations occur in three regions in southwestern Oregon, which are separated by more than 50 miles (80 km). The three separate groups are in the Klamath Mountains and on either side of the Cascade Range. This plant is a perennial herb growing up to 1.2 meters (3 ft 11 in) in height. The roots are pink to reddish brown in color. The inflorescence is an umbel of

Lomatium greenmanii is a rare species of flowering plant in the carrot family known by the common names Greenman's desertparsley and Greenman's biscuitroot. It is endemic to Oregon in the United States, where it is found only in the Wallowa Mountains of Wallowa County. This is a petite perennial herb with highly dissected green basal leaves each 3 to 6 centimeters long. The inflorescence is borne on a stem just a few centimeters tall. It is an umbel of tiny yellow flowers. Blooming occurs in July and August after the snow melts in its high elevation habitat. The plant grows in the subalpine

Lomatium cookii is a rare species of flowering plant in the carrot family known by the common names Cook's lomatium and agate desertparsley. It is endemic to Oregon in the United States, where it grows in only two valleys. It is a federally listed endangered species. This plant was first collected in 1981 during a survey for the rare Limnanthes floccosa ssp. grandiflora, the big-flowered woolly meadowfoam. It was described as a new species in 1986. The plant grows only in the Agate Desert of Jackson County and the Illinois Valley of Josephine County in southwestern Oregon. It occurs in

Kalmiopsis fragrans is a rare species of flowering plant in the heath family known by the common name North Umpqua kalmiopsis. It is endemic to Oregon in the United States, where there are just a few known populations, all within Douglas County. This plant has been known since the 1950s but it was generally treated as a form of Kalmiopsis leachiana. In 2007 it was separated and described as a new species. It differs slightly from K. leachiana in the size and shape of the flower.

Iris tenuis (Clackamas iris) is a plant species in the genus Iris, subgenus Limniris. It is a rhizomatous perennial, endemic to Clackamas County, Oregon. The flowers are white, pale blue or lilac, with a yellow or golden low dissected crest and pale green leaves. It is cultivated as an ornamental plant in temperate regions.

Fragaria cascadensis is a species of strawberry found in the Cascades Mountains described in 2012. The vernacular name Cascade strawberry was suggested by the describing author.

Erigeron decumbens is a species of flowering plant in the family Asteraceae known by the common names Willamette fleabane or Willamette daisy. It is native to Oregon and California in the United States. The taxonomy of the plant varies by author. It may be treated as a species with two varieties, the Californian variety var. robustior and the rare and endangered Oregon variety, var. decumbens. Alternately, the rare var. decumbens may be the only variety included within the species description and so named Erigeron decumbens, with var. robustior separated and named Erigeron robustior. The

Delphinium pavonaceum (syn. Delphinium × pavonaceum) is a species of flowering plant in the buttercup family known by the common name peacock larkspur. It is endemic to Oregon in the United States, where it is limited to the Willamette Valley.

Castilleja glandulifera, commonly called the glandular paintbrush or sticky paintbrush is a species of paintbrush.

Calochortus umpquaensis is a species of flowering plant in the lily family known by the common name Umpqua mariposa lily. It is endemic to Oregon in the United States, where it is mainly limited to the region of the Klamath Mountains on the Little River in Douglas County, in particular the Watson and Ace Williams Mountains. The flower has also been found at a single location in each of Josephine and Jackson Counties. This plant was described to science in 1989 when an isolated population of what had been reported to be Calochortus howellii was shown to belong to a separate species. The stem

Calochortus howellii, or Howell's mariposa lily, is a rare North American species of flowering plants in the lily family, found only in Josephine and Curry Counties in south-western Oregon. Calochortus howellii is a bulb-forming perennial with straight stems up to 40 cm tall. Petals are white or pale yellow with purple hairs on the petals. It grows on serpentine outcrops at lower or middle elevations.

Calochortus coxii is a rare species of flowering plant in the lily family known by the common names Cox's mariposa lily and crinite mariposa lily. It is endemic to Oregon in the United States, where it is known only from Douglas County. This rare plant was first described in 1988. It is a perennial herb growing 15 to 25 centimeters tall. The narrow leaves are up to 30 centimeters long and have hairy upper surfaces and hairless, shiny undersides. The inflorescence contains 1 to 7 showy bell-shaped flowers with petals up to 2.5 centimeters long. They are white with red striping and a large

Botrychium pumicola is a rare fern with the common name pumice moonwort.

Sidalcea cusickii, or Cusick's checkerbloom, is a species of flowering plant in the family Malvaceae. It is endemic to Oregon in the United States. This species is a perennial herb reaching 1.8 meters in maximum height. It grows from a thick taproot and rhizomes. It produces several purple-tinged, often hollow stems lined with toothed, palmate leaves. They bear dense, spike-shaped inflorescences of many flowers. This plant grows in moist to wet areas with fertile soils, such as mountain meadows. It may be associated with rushes and camas.

Sidalcea campestris is a species of flowering plant in the mallow family known by the common name meadow checker-mallow. It is native only to portions of western Oregon, in the Pacific Northwest region of North America.

Senecio ertterae is a species of flowering plant in the aster family known by the common name Ertter's ragwort. It is endemic to Oregon, United States. This annual herb grows 20 to 50 centimeters tall, sometimes reaching 60 centimeters or more. The leaves and stems are slightly succulent. The lance-shaped or spatula-shaped leaves are borne on winged petioles. The inflorescence is a cyme-shaped array of several flower heads. The yellow ray florets are each about half a centimeter long. Flowering occurs in July through October. This species occurs in the Leslie Gulch in eastern Oregon, in

Sedum moraniii is a rare species of flowering plant in the family Crassulaceae known by the common name Rogue River stonecrop. It is endemic to Oregon in the United States, where it only grows in Josephine County next to the Rogue River. This is a perennial herb with a glandular rootstock producing rosettes of leaves and flowering shoots. The fleshy leaves are green in color and the young ones are waxy in texture. Mature stems and leaves may be reddish or purple. Leaves toward the ends of the stems may be hairy. They are up to 3.2 centimeters long by 1.4 wide. The flowering stem is up to 30

Ribes erythrocarpum is an uncommon North American species of currant known by the common name Crater Lake currant.

Lomatium erythrocarpum, known by the common name redfruit desertparsley, is a rare species of flowering plant in the carrot family. It is endemic to Oregon in the United States, where it is limited to a section of the Blue Mountains within Baker County. This wild plant is a petite perennial herb with leaves that lie against the ground and a flowering stalk that grows just a few centimeters tall. The hairless, gray-green, waxy-textured leaves are finely divided into many tiny segments. The leaf morphology may help it retain heat and increase photosynthesis, which is necessary because it grows

Hastingsia bracteosa is a rare species of flowering plant in the agave subfamily of the asparagus family known by the common name large-flowered rushlily. It is endemic to Oregon in the United States, where it is limited to a twelve-mile stretch of the Illinois Valley in the southwestern part of the state. This plant grows from a dark-coated bulb and produces gray-green leaves up to 52 centimeters long. The slender, erect scape grows up to 87 centimeters tall. At the top is an inflorescence which is a raceme of many flowers. Each flower has tepals roughly 1 centimeter long. Some plants

Astragalus applegatei is a rare species of milkvetch known by the common name Applegate's milkvetch. Its scientific name is also spelt Astragalus applegatii. It is endemic to Klamath County, Oregon, where it is known from three populations, one of which is made up of only three plants. Much of the remaining habitat is seriously threatened by development, introduced plant species, and other forces. This is a federally listed endangered species of the United States. The plant is a perennial herb with clustered or spreading prostrate stems growing from a taproot. It may form mats nearly a metre