Allium vineale is a perennial, bulb-forming species of wild onion, native to Europe, northwestern Africa and the Middle East. The species was introduced in Australia and North America, where it has become a noxious weed.
Allium anceps, known as twinleaf onion and Kellogg's onion, is a species of wild onion native to the western United States. It is widespread in Nevada, extending into adjacent parts of California, Idaho, and Oregon. It grows in barren clay and rocky soils.
Allium unifolium, the one-leaf onion or American garlic, is a North American species of wild onion. It is native to the coastal mountain ranges of California, Oregon, and Baja California. It grows on clay soils including serpentine, at elevations up to 1100 m.
Allium triquetrum is a bulbous flowering plant in the genus Allium native to the Mediterranean basin. It is known in English as three-cornered leek, in Australia as angled onion and in New Zealand as onion weed. Both the English name and the specific epithet triquetrum refer to the three-cornered shape of the flower stalks.
Allium amplectens, the narrowleaf onion, is a species of flowering plant. It is a onion native to the west coast of the United States, in Oregon, Washington State and California, also British Columbia in Canada. It grows in woods and especially in clay and serpentine soils.
Allium atrorubens is a species of wild onion known by the common name dark red onion. This plant is native to the southwestern United States where it grows in the sandy soils of the Mojave Desert, the Great Basin and higher-elevation deserts in Nevada, eastern California southwestern Utah, northwestern Arizona.
Allium dichlamydeum is a species of wild onion known by the common name coastal onion. It is endemic to California where it grows on sea cliffs and hills overlooking the ocean, from Santa Barbara County to Mendocino County.
Allium falcifolium is a North American species of wild onion known by the common name scytheleaf onion or coast flatstem onion. It is native to northern California and southern Oregon, where it grows in heavy, rocky soils, especially serpentine soils.
Allium obtusum is a species of wild onion known by the common name red Sierra onion or subalpine onion. It is native to eastern California and western Nevada. It is a common plant in the granite foothills and mountains of the Sierra Nevada and southern Cascade Range, from Tulare County to Siskiyou County, from elevations of 800 to 3,500 metres. In Nevada, it is reported only from Washoe County in the northwestern part of the state.
Allium platycaule is a species of wild onion known as broadstemmed onion or flat-stem onion. It is native to northeastern California, south-central Oregon and northwestern Nevada. It is found on slopes of elevations of 1500–2500 m.
Allium bolanderi is a species of wild onion known by the common name Bolander's onion. It is native to northern California and southwestern Oregon, where it grows in the rocky soils of the Klamath Mountains and surrounding regions.
Allium burlewii is a species of wild onion known by the common name Burlew's onion. It is endemic to California, where grows in the granitic soils of several of the central and southern mountain ranges from Riverside and San Bernardino to Fresno and Monterey Counties, usually between 6,000 and 10,000 feet above sea level.
Allium cratericola is a species of wild onion known by the common name Cascade onion. It is endemic to California, where is an uncommon member of the flora in several of the state's mountain ranges, including the northern and southern California Coast Ranges, the western Transverse Ranges, Klamath Mountains, and the Sierra Nevada foothills. Its range covers much of the state, from Riverside County to Siskiyou County.
Allium hoffmanii is a species of wild onion known by the common name beegum onion. It is native to northern California, where it grows in the serpentine soils of the local mountain ranges in Siskiyou, Humboldt, Trinity, Shasta, and Tehama Counties.
Allium membranaceum is an uncommon species of wild onion known by the common name papery onion. It is endemic to California, where it grows in wooded areas in the southernmost Cascade Range, the northern Coast Ranges, and the Sierra Nevada foothills from Tulare County to Humboldt County. It is found on wooded slopes at elevations of 200–1400 m.
Allium praecox is a species of wild onion known by the common name early onion.
Allium sanbornii is a North American species of wild onion known by the common name Sanborn's onion. It is native to northern California and southwestern Oregon. It grows in the serpentine soils of the southern Cascade Range and northern Sierra Nevada foothills.
Allium yosemitense is a California species of wild onion known by the common name Yosemite onion. Most of the known populations are situated within the boundaries of Yosemite National Park.
Allium bisceptrum, also known as the twincrest onion or aspen onion, is a high elevation plant native to western United States. It is a perennial that thrives under damp and shady conditions or open meadows in California, Arizona, New Mexico, Nevada, Oregon, Washington, Idaho, and Utah.
Trifolium siskiyouense, the Siskiyou clover, is a clover species endemic to the Klamath Mountains in the western United States.
