| Osmadenia | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Subfamily: | Asteroideae |
| Tribe: | Madieae |
| Subtribe: | Madiinae |
| Genus: | Osmadenia Nutt. |
| Species: | O. tenella |
| Binomial name | |
| Osmadenia tenella Nutt. | |
| Synonyms [1] | |
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Osmadenia is a genus of flowering plants in the family Asteraceae. It contains the single species Osmadenia tenella, which is known by the common name false rosinweed. [2]
Osmadenia tenella is native to the coastal plains and the hills and canyons of the Transverse Ranges in Southern California, and the Peninsular Ranges in Southern California and Baja California. [3]
It is an uncommon member of the flora in local habitats, such as the coastal sage and chaparral and montane chaparral and woodlands sub-ecoregions.
Osmadenia tenella is a hairy, glandular, aromatic annual herb producing an erect stem approaching 40 centimeters (16 inches) in maximum height with threadlike branches. The linear leaves are alternately arranged, the largest low on the plant measuring up to 5 centimeters. [2]
The inflorescence is a cyme of several flower heads. Each head has 3 to 5 three-lobed ray florets which are white or pink-tinged and often have a pink spot, and several narrower disc florets. [2]
The fruit is an achene; those arising from disc florets have pappi.
Calycadenia is a genus of flowering plants in the family Asteraceae, known commonly as the western rosinweeds. They are native to California, especially around the Central Valley. The ranges of two species (C. fremontii + C. truncata) do extend north into Oregon.
Encelia californica is a species of flowering plant in the family Asteraceae known by the common name California brittlebush. It is also commonly referred to as California coast sunflower and California bush sunflower.
Eriophyllum confertiflorum, commonly called golden yarrow or yellow yarrow, is a North American species of plant in the family Asteraceae, native to California and Baja California. It has wooly leaves when young, and yellow flower heads. "Eriophyllum" means "wooly leaved."
Heterotheca oregona is a species of flowering plant in the family Asteraceae known by the common name Oregon false goldenaster. It is native to the west coast of Canada and the United States in British Columbia, Washington, Oregon, and California as far south as Los Angeles County.
Acourtia microcephala is a species of flowering plant in the family Asteraceae known by the common name sacapellote. It is native to southern California and Baja California, where it grows in woodland and chaparral, especially in the coastal mountain ranges.
Chaenactis artemisiifolia, with the common name white pincushion, is a species of flowering plant in the daisy family. It is native to the coastal Peninsular Ranges of Southern California and Baja California, in the chaparral and woodlands.
Calycadenia fremontii is a species of flowering plant in the daisy family known by the common name Frémont's western rosinweed. It is native to southwestern Oregon and northern California. It is a common member of the flora in several types of habitat in the mountains, foothills, and valleys. This annual plant is variable in appearance.
Calycadenia mollis is a species of flowering plant in the family Asteraceae known by the common name soft western rosinweed. It is native to a section of central California, from Tuolumne County do northern Tulare County. There are also isolated populations farther north in Nevada County. The plant grows in a number of habitat types in the Central Valley and adjacent Sierra Nevada foothills.
Calycadenia multiglandulosa is a species of flowering plant in the family Asteraceae, known by the common names sticky calycadenia and sticky western rosinweed. It is endemic to California, where it is a common in the Coast Ranges and in the Sierra Nevada Foothills from Shasta County to Kern County.
Calycadenia oppositifolia is a species of flowering plant in the family Asteraceae known by the common name Butte County western rosinweed. It is native primarily to Butte County, California, although a few populations have been found in other parts of the state. It grows in the foothills of the high mountain ranges.
Calycadenia pauciflora is a species of flowering plant in the family Asteraceae known by the common name smallflower western rosinweed. It is endemic to northern California, where it grows in the Coast Ranges north of the San Francisco Bay Area from Napa County to Tehama County, often on serpentine soils.
Calycadenia spicata is a species of flowering plant in the family Asteraceae known by the common name spiked western rosinweed. It is endemic to central California, where is a common grassland plant in the Central Valley and adjacent Sierra Nevada foothills from Butte County to Kern County.
Calycadenia villosa is an uncommon species of flowering plant in the family Asteraceae known by the common name dwarf western rosinweed. It is endemic to central California, where it is known from a limited distribution in the Central Coast Ranges in Monterey County and San Luis Obispo County, with a few populations in Santa Barbara and western Fresno Counties. There are perhaps 16 occurrences.
Encelia actoni, also known by the common names Acton brittlebush and Acton encelia, is a species of flowering plant in the family Asteraceae.
Corethrogyne filaginifolia is a species of flowering plant in the daisy family known by the common names common sandaster and California aster.
Lessingia tenuis is a species of flowering plant in the family Asteraceae known by the common name spring lessingia. It is endemic to California, where it is known from the San Francisco Bay Area to Ventura County. It grows on the slopes of the California Coast Ranges in common local habitat such as chaparral.
Senecio aphanactis, known by the common names chaparral ragwort, rayless ragwort, and California groundsel, is a species of flowering plant in the aster family.
Senecio californicus is a species of flowering plant in the aster family known by the common name California ragwort.
Packera ganderi is a rare species of flowering plant in the aster family known by the common name Gander's ragwort. It is endemic to southern California, where it is known from a few occurrences in San Diego and Riverside Counties.
Stephanomeria cichoriacea is a species of flowering plant in the family Asteraceae; it is known by the common names chicoryleaf wirelettuce and silver rock-lettuce. It is endemic to California, where it grows in the coastal mountain ranges as far north as Monterey County, but especially in southern California mountains such as the Transverse Ranges. Its habitat includes chaparral. It is a perennial herb producing slender erect stems reaching maximum heights exceeding one meter. The stem is woolly with hairs, especially on new growth. The leaves are mostly located in a basal rosette, the largest reaching 18 to 20 centimeters long. They are lance-shaped and often toothed along the edges, and the newer ones are woolly. Smaller leaves occur farther up the stem. The inflorescence is a long array of several flower heads, with some occurring in the upper leaf axils as well. Each head has a cylindrical base 1 to 2 centimeters long which is lined with layers of glandular phyllaries. The head contains 10 to 15 ray florets, each with an elongated tube and a pink ligule which may be up to 2 centimeters long. The fruit is an achene tipped with a spreading cluster of long, plumelike pappus bristles.
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