Polygonum arenastrum, commonly known as equal-leaved knotgrass, is a summer annual flowering plant in the knotweed family Polygonaceae. Other common names include common knotweed, prostrate knotweed, mat grass, oval-leaf knotweed, stone grass, wiregrass, and door weed, as well as many others. It is native to Europe and can be found on other continents as an introduced species and a common noxious weed. Knotweed was first seen in North America in 1809 and is now seen across much of the United States and Canada.
Arctotheca calendula is a plant in the sunflower family commonly known as capeweed, plain treasureflower, cape dandelion, or cape marigold because it originates from the Western Cape Province in South Africa. It is also found in neighboring KwaZulu-Natal.
Ribes bracteosum, the stink currant, is a species of currant native to western coastal North America from southeastern Alaska to Mendocino County in California.
Lilium columbianum is a lily native to western North America. It is also known as the Columbia lily, Columbia tiger lily, or simply tiger lily.
Eurybia radulina, commonly known as the roughleaf aster, is an herbaceous perennial in the family Asteraceae. It is native to western North America, where it is present primarily west of the Cascade Range in both Canada and the United States. Its habitats include dry rock outcrops, slopes, edges of forests, and oak woodlands.
Arctotis stoechadifolia, the African daisy or white arctotis, is a rare species of South African plants in the family Asteraceae. It is a rare plant found only in sand dunes along the West coast of Cape Province.
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.
Adenophyllum porophylloides is a species of flowering plant in the family Asteraceae known by the common names San Felipe dogweed and San Felipe dyssodia. It is native to the Sonoran and Mojave Deserts of the southwestern United States and northwestern Mexico. It grows in alluvial fans, rocky slopes, open scrub and woodlands.
Ambrosia ilicifolia is a species of ragweed known by the common names hollyleaf burr ragweed and hollyleaf bursage.
Artemisia arbuscula is a North American species of sagebrush known by the common names little sagebrush, low sagebrush, or black sagebrush. It is native to the western United States from Washington, Oregon, and California east as far as Colorado and Wyoming. It grows in open, exposed habitat on dry, sterile soils high in rock and clay content.
Chaenactis nevadensis, with the common name Nevada dustymaiden, is a North American species of flowering plant in the daisy family.
Cirsium ochrocentrum is a species of thistle known by the common name yellowspine thistle. It is native to the Great Plains of the Central United States and to the desert regions of the western United States and northern Mexico. Its range extends from eastern Oregon east to the Black Hills of South Dakota, south as far as the Mexican State of Durango.
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.
Corethrogyne is a monotypic genus of flowering plant in the family Asteraceae. Its only species is Corethrogyne filaginifolia, known by the common names common sandaster and California aster.
Brewerimitella ovalis is a species of flowering plant in the saxifrage family known by the common names coastal miterwort and oval-leaf miterwort. It is native to western North America from southwestern British Columbia, including Vancouver Island, to northern California as far south as Marin County. It grows in moist, shady habitat, such as coastal forests and streambanks.
Polygonum bidwelliae is an uncommon species of flowering plant in the knotweed family known by the common name Bidwell's knotweed. The plant was named for American suffragist Annie Bidwell, who at one time lived in the Bidwell Mansion in Chico, California. She is the person who collected the type specimen in Northern California.
Polygonum polygaloides is a North American species of flowering plants in the buckwheat family known by the common names milkwort knotweed and polygala knotweed. It is native to much of western North America, where it can be found in many types of moist habitat. It is a variable species, usually divided into a number of subspecies.
Ranunculus eschscholtzii is a species of buttercup flower known by the common name Eschscholtz's buttercup.
Rubus ulmifolius is a species of wild blackberry known by the English common name elmleaf blackberry or thornless blackberry and the Spanish common name zarzamora. It is native to Europe and North Africa, and has also become naturalized in parts of the United States, Australia, and southern South America.
Polygonum spergulariiforme is a North American species of flowering plants in the buckwheat family known by the common name spurry knotweed or fall knotweed. It grows in western Canada and the western United States.
