| Dimeresia | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Subfamily: | Asteroideae |
| Tribe: | Chaenactideae |
| Genus: | Dimeresia A.Gray |
| Species: | D. howellii |
| Binomial name | |
| Dimeresia howellii | |
| Synonyms [1] | |
| |
Dimeresia is a monotypic genus in the sunflower family containing the single species Dimeresia howellii, known by the common name doublet. [2] [3] [4]
This uncommon plant is endemic to an area of the Great Basin region in the western United States, in northeastern California, southeastern Oregon, southwestern Idaho, and northwestern Nevada. [2] [5] [6] [7]
It grows in dry volcanic soils, primarily on the Modoc Plateau volcanic plain, at elevations of 1,500–2,400 metres (4,900–7,900 ft). [5]
Dimeresia howellii is a very tiny annual flowering plant rarely exceeding 4 centimeters in height or width. It forms a small tuft on the ground with several oval-shaped leaves, and is cobwebby at base and glandular above. [5]
The inflorescence has tiny white to purple bell-shaped flowers each a few millimeters long. [5] The flowering period is May to August. [2]
Coreopsis calliopsidea is a species of flowering plant in the daisy family known by the common name leafstem tickseed. It is endemic to California. The plant grows in some of the southern coastal mountain ranges and Transverse Ranges and the Mojave Desert from Alameda and Inyo Counties south to Riverside County.
Achyronychia is a monotypic genus of flowering plant containing the single species Achyronychia cooperi, which is known by the common names onyxflower and frost-mat. This plant is native to the Mojave and Sonoran Deserts of northern Mexico and the U.S. states of California, Nevada, Utah and Arizona. In California, it is known from San Diego, Imperial, Riverside, Los Angeles, San Bernardino and Inyo Counties. In Arizona, it occurs in Yuma, Mohave, Pima, Pinal and Maricopa Counties. It has also been reported from Washington County in Utah, and from Clark County, Nevada.
Ericameria arborescens is a North American species of flowering plants in the family Asteraceae known by the common name goldenfleece. It is widespread across much of California and found also in southwestern Oregon.
Ericameria discoidea, commonly known as whitestem goldenbush or sharp-scale goldenweed is a species of flowering shrub in the family Asteraceae. This plant is native to the western United States from California, Oregon, Nevada, Utah, Colorado, Idaho, and Montana.
Eriophyllum multicaule is a North American flowering plant in the family Asteraceae, known by the common name manystem woolly sunflower. It is native to California and Arizona in the southwestern United States.
Helenium bolanderi is a North American species of flowering plant in the daisy family known by the common name coastal sneezeweed. It is native to southern Oregon and northern California as far south as Mendocino County, primarily along the seacoast.
Hulsea californica is a rare species of flowering plant in the family Asteraceae known by the common names San Diego alpinegold and San Diego sunflower. It is endemic to southern California, where it grows only in the Peninsular Ranges.
Hulsea nana is a North American species of flowering plant in the family Asteraceae known by the common name dwarf alpinegold. It is native to the western United States from Washington, Oregon, and far northern California.
Hulsea vestita is a species of flowering plant in the family Asteraceae known by the common name pumice alpinegold.
Isocoma acradenia is a North American species of flowering plant in the family Asteraceae known by the common name alkali goldenbush.
Allium howellii is a North American species of wild onion known by the common name Howell's onion. It is endemic to California.
Antennaria flagellaris is a North American species of flowering plant in the family Asteraceae known by the common names whip pussytoes and stoloniferous pussytoes. It is native primarily to the Great Basin and Columbia Plateau regions of Washington, Oregon, Idaho, and northern Nevada, where it is a member of the sagebrush scrub plant community. Additional populations are found in northeastern California, Wyoming, the Black Hills of South Dakota, and the Canadian Province of British Columbia.
Chenopodium hians is a species of flowering plant in the family Amaranthaceae known by the common names hians goosefoot and gaping goosefoot. The Latin species name hians means "gaping".
Chorizanthe howellii is a species of flowering plant in the buckwheat family known by the common names Mendocino spineflower and Howell's spineflower. It is endemic to coastal Mendocino County, California, where it is known only from the sand dunes and coastal scrub near Fort Bragg. It is estimated that 95% of the remaining individuals of this plant are part of a single population growing at MacKerricher State Park. It is a federally listed endangered species.
Crepis pleurocarpa is a North American species of flowering plant in the family Asteraceae known by the common name nakedstem hawksbeard. It is native to the western United States (Washington, Oregon, northern California and western Nevada.
Leptosiphon nuttallii is a species of flowering plant in the phlox family known by the common name Nuttall's linanthus.
Lomatium howellii is an uncommon species of flowering plant in the carrot family known by the common name Howell's biscuitroot, or Howell's lomatium. It is native to the Klamath Mountains of southern Oregon and northern California, where it is a member of the local serpentine soils flora.
Sabulina howellii is an uncommon species of flowering plant in the family Caryophyllaceae known by the common names Howell's stitchwort and Howell's sandwort.
Senecio aphanactis, known by the common names chaparral ragwort, rayless ragwort, and California groundsel, is a species of flowering plant in the aster family.
Erythronium howellii, or Howell's fawn lily, is a flowering bulb in the lily family endemic to northwestern California and southwestern Oregon.
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