''Streptanthus'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

of plants within the family

Brassicaceae Brassicaceae () or (the older) Cruciferae () is a medium-sized and economically important family of flowering plants commonly known as the mustards, the crucifers, or the cabbage family. Most are herbaceous plants, while some are shrubs. The le ...

. There are about 35 known

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

within the genus ''Streptanthus'', distributed mostly throughout western North America. The common names for this genus are twistflower and jewelflower. Twenty-four of the species and eleven lesser taxa occur in

California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...

, thirty-two of which are California

endemics Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found else ...

; seventeen of these California taxa are classified as rare plants.

Species or subspecies

The following are some of the species (or subspecies) of the genus ''Streptanthus'' (county locations are not intended to be exhaustive): *''

Streptanthus albidus ''Streptanthus albidus'' is a species of flowering plant in the mustard family known by the common name Metcalf Canyon jewelflower. It is endemic to California, where it is known only from the Central Coast Ranges and San Francisco Bay Area. It ...

'', Metcalf Canyon jewelflower **''Streptanthus albidus albidus'', Metcalf Canyon jewelflower (

Santa Clara County, California Santa Clara County, officially the County of Santa Clara, is the sixth-most populous county in the U.S. state of California, with a population of 1,936,259, as of the 2020 United States Census, 2020 census. Santa Clara County and neighboring Sa ...

), endangered **''Streptanthus albidus peramoenus'', Uncommon jewelflower, most beautiful jewelflower (

) *'' Streptanthus barbatus'', Pacific jewelflower *'' Streptanthus barbiger'', Bearded jewelflower *''

Streptanthus batrachopus ''Streptanthus batrachopus'' is a rare species of flowering plant in the Brassicaceae, mustard family known by the common name Mt. Tamalpais jewelflower. It is Endemism, endemic to Marin County, California, where it is known only from Mount Tamal ...

'', Mt. Tamalpais jewelflower *''

Streptanthus bernardinus ''Streptanthus bernardinus'' is a species of flowering plant in the mustard family known by the common name Laguna Mountains jewelflower, or Laguna Mountain jewelflower. Distribution It is native to southern California and northern Baja Californ ...

'', Laguna Mountain jewelflower *'' Streptanthus brachiatus'', Socrates Mine jewelflower *''

Streptanthus bracteatus ''Streptanthus bracteatus'' is a species of flowering plant in the mustard family known by the common names bracted jewelflower and bracted twistflower. It is endemic to Texas in the United States.Streptanthus breweri ''Streptanthus breweri'' is a species of flowering plant in the mustard family known by the common name Brewer's jewelflower. It is endemic to California, where it can be found in the coastal mountain ranges from the Klamath Mountains south to th ...

'', Brewer's jewelflower *''

Streptanthus callistus ''Streptanthus callistus'' is a rare species of flowering plant in the mustard family known by the common name Mount Hamilton jewelflower. It is endemic to Santa Clara County, California, where it is known from only about five occurrences around ...

'', Mt. Hamilton jewelflower *'' Streptanthus campestris'', Southern jewelflower *''

Streptanthus carinatus ''Streptanthus carinatus'', the lyreleaf jewelflower, is an annual to biennial plant in the mustard family (Brassicaceae) found in the Arizona Upland of the Sonoran Desert The Sonoran Desert ( es, Desierto de Sonora) is a desert in North Amer ...

'', Lyreleaf jewelflower *''

Streptanthus cordatus ''Streptanthus cordatus'' is a species of flowering plant in the mustard family known by the common name heartleaf twistflower. It is native to the western United States, where it can be found in many types of sagebrush, woodland, and forest habi ...

'', Heartleaf twistflower *'' Streptanthus diversifolius'', Variableleaf jewelflower *'' Streptanthus drepanoides'', Sicklefruit jewelflower *'' Streptanthus farnsworthianus'', Farnsworth's jewelflower *''

Streptanthus fenestratus ''Streptanthus fenestratus'' is an uncommon species of flowering plant in the mustard family known by the common name Tehipite Valley jewelflower. Distribution It is endemic to Fresno County, California, where it is known only from the high moun ...

'', Tehipite Valley jewelflower (

Fresno County, California Fresno County (), officially the County of Fresno, is a county located in the central portion of the U.S. state of California. As of the 2020 Census, the population was 1,008,654. The county seat is Fresno, the fifth-most populous city in Cali ...

) *''

Streptanthus glandulosus ''Streptanthus glandulosus'' is a species of flowering plant in the mustard family known by the common name bristly jewelflower. It is native to California and southwestern Oregon, where it grows in many types of habitat, including grassland, cha ...

'', Bristly jewelflower, common jewelflower (

Mendocino County Mendocino County (; ''Mendocino'', Spanish language, Spanish for "of Antonio de Mendoza, Mendoza) is a County (United States), county located on the North Coast (California), North Coast of the U.S. state of California. As of the 2020 United Sta ...

San Luis Obispo County, California San Luis Obispo County (), officially the County of San Luis Obispo, is a County (United States), county on the Central Coast (California), Central Coast of California. As of the 2020 United States Census, 2020 census, the population was 282, ...

)David Rogers, The Double Cone Register, Vol IX, no. 1, Spring, 2006
/ref> *''

Streptanthus gracilis ''Streptanthus gracilis'' is an uncommon species of flowering plant in the mustard family known by the common name alpine jewelflower. Distribution It is endemic to California, where it is known only from the Kings-Kern Divide in the Sierra Neva ...

'', Alpine jewelflower *''

Streptanthus hispidus ''Streptanthus hispidus'', the Mt. Diablo jewelflower, is a rare species of flowering plant in the mustard family. Distribution It is endemic to Contra Costa County, California, where it is known from fewer than 15 occurrences on and around Moun ...

'', Mt. Diablo jewelflower (

Contra Costa County, California ) of the San Francisco Bay , subdivision_type = Country , subdivision_name = United States , subdivision_type1 = State , subdivision_name1 = California , subdivision_type2 ...

) *''

Streptanthus howellii ''Streptanthus howellii'' is an uncommon species of flowering plant in the mustard family known by the common name Howell's jewelflower. It is endemic to the Klamath Mountains of southern Oregon and northern California. It grows in mountain fores ...

'', Howell's jewelflower *'' Streptanthus hyacinthoides'', Sandhill twistflower (

Texas Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...

Arkansas Arkansas ( ) is a landlocked state in the South Central United States. It is bordered by Missouri to the north, Tennessee and Mississippi to the east, Louisiana to the south, and Texas and Oklahoma to the west. Its name is from the Osage ...

Louisiana Louisiana , group=pronunciation (French: ''La Louisiane'') is a state in the Deep South and South Central regions of the United States. It is the 20th-smallest by area and the 25th most populous of the 50 U.S. states. Louisiana is borde ...

Oklahoma Oklahoma (; Choctaw language, Choctaw: ; chr, ᎣᎧᎳᎰᎹ, ''Okalahoma'' ) is a U.S. state, state in the South Central United States, South Central region of the United States, bordered by Texas on the south and west, Kansas on the nor ...

Nebraska Nebraska () is a state in the Midwestern region of the United States. It is bordered by South Dakota to the north; Iowa to the east and Missouri to the southeast, both across the Missouri River; Kansas to the south; Colorado to the southwe ...

) *'' Streptanthus insignis'', Plumed jewelflower *'' Streptanthus longisiliquus'', Longfruit jewelflower *''

Streptanthus maculatus ''Streptanthus maculatus'' is a species of flowering plant in the mustard family known by the common name clasping jewelflower. It is found in Texas, Arkansas and Oklahoma. It is the type species In zoological nomenclature, a type species (''sp ...

'', Clasping jewelflower, type species, (

) *'' Streptanthus morrisonii'', Morrison's jewelflower *''

Streptanthus niger ''Streptanthus niger'' is an endangered species within the family Brassicaceae. Like other genus members, this herb has wavy petal margins with perimeter calluses that discourage larval herbivory. This plant is endemic to the Tiburon Peninsul ...

'', Tiburon jewelflower (

Marin County, California Marin County is a County (United States), county located in the northwestern part of the San Francisco Bay Area of the U.S. state of California. As of the 2020 United States Census, 2020 census, the population was 262,231. Its county seat and ...

), endangered *'' Streptanthus oliganthus'', Masonic Mountain jewelflower *'' Streptanthus polygaloides'', Milkwort jewelflower *'' Streptanthus tortuosus'', Mountain jewelflower, shieldplant *'' Streptanthus vernalis'', Early jewelflower

References

External links

Jepson Manual Treatment
Brassicaceae genera {{Brassicales-stub