Allium tuolumnense is a rare species of wild onion, known by the common name Rawhide Hill onion.
Allium tribracteatum, known by the common name Threebract onion, is a species of wild onion found in California.
Angelica arguta is a species of angelica known as Lyall's angelica. It is native to western North America, where it grows in coniferous forests from British Columbia to Utah. This is a taprooted perennial herb growing an erect, hollow stem to heights between one and two meters. It produces large, somewhat triangular leaves made up of many toothed, pointed leaflets each up to 9 centimeters long. The top of the stout stem is occupied by an inflorescence in a compound umbel arrangement, with the webbed rays of the umbel up to 10 centimeters long each. The flowers are generally yellowish.
Angelica breweri is a species of angelica known as Brewer's angelica. It is native to the high mountain ranges of eastern California and far western Nevada, where it grows in coniferous forests. This is a taprooted perennial herb producing an erect, hollow, hairy stem to heights between 1 and 2 meters. The large leaves are composed of many highly dissected leaflets, each up to 10 centimeters long. The inflorescence is a compound umbel with up to 50 long rays holding clusters of hairy white flowers. The base of each pedicel has a thick webbing. The fruit is a pair of ribbed bodies, each containing a seed.
Angelica callii is an uncommon species of angelica known as Call's angelica. It is endemic to the Sierra Nevada of California, where it grows by forest streams.
Angelica hendersonii is a species of angelica known as Henderson's angelica. It is native to the west coast of the United States from Washington to central California, where it grows in the coastal sage scrub and other habitat on the immediate coastline. This is a taprooted perennial herb producing a branching erect stem to heights between about 1 and 2 meters. The basal leaves are made up of oval-shaped leaflets each up to 10 centimeters long, with toothed edges and white woolly undersides. The woolly inflorescences are compound umbels of up to 60 rays holding clusters of fuzzy flowers. The flowers yield fruits which are paired bodies nearly a centimeter long each containing a seed.
Angelica kingii is a species of angelica known as King's angelica. It is native to the western United States, especially the Great Basin region. This is a taprooted perennial herb varying in shape and size. It produces an erect, hollow stem to heights between 30 centimeters and two meters. The large leaves are composed of many lance-shaped leaflets each up to 12 centimeters in length. The inflorescence is a compound umbel with up to 14 long rays each holding clusters of small hairy flowers. The fruit is a pair of bodies about half a centimeter long each containing a seed.
Angelica tomentosa is a species of angelica known as woolly angelica. It is native to the coastal mountain ranges of California and southern Oregon, where it grows in wooded areas. This is a taprooted perennial herb producing an erect, hollow stem to heights generally between 1 and 2 meters. The leaves may be nearly a meter long but are actually made up of many leaflike leaflets, each up to 12 centimeters long and lance-shaped to oval and sometimes toothed. The inflorescence is a compound umbel of up to 60 long rays each bearing clusters of whitish or yellowish flowers.
Arctostaphylos canescens, common name hoary manzanita, is a species of manzanita.
Arctostaphylos mewukka is a species of manzanita known by the common name Indian manzanita.
Arctostaphylos osoensis is a species of manzanita known by the common name Oso manzanita. It is endemic to San Luis Obispo County, California, where it is known from only two occurrences on the northern edge of the Los Osos Valley.
Arctostaphylos purissima is a species of manzanita known by the common name La Purisima manzanita.
Arctostaphylos refugioensis is a species of manzanita, known by the common name Refugio manzanita. It is endemic to Santa Barbara County, California, where it can be found along the immediate coastline, including the vicinity of Refugio State Beach, and into the Santa Ynez Mountains of the northwestern Transverse Ranges.
Arctostaphylos regismontana is a species of manzanita known by the common name Kings Mountain manzanita. It is endemic to California, where it is known from the northern slopes of the Santa Cruz Mountains in the southern San Francisco Bay Area.
Astragalus agrestis is a species of milkvetch known by the common names purple milkvetch, purple loco, and field milkvetch. It is native to much of western and northern North America from most of Canada to the southwestern United States, as well as eastern Asia. It grows in vernally moist areas such as meadows, and is often found in sagebrush.
Angelica pachycarpa, the Portuguese angelica, is a herbaceous perennial plant native to north western Spain and western Portugal, and naturalized in New Zealand. It inhabits forests, grasslands and stream sides and is occasionally grown as an ornamental garden subject for its glossy foliage and umbels of white flowers.
Gratiola neglecta is a species of flowering plant known by the common name clammy hedgehyssop. It is native to much of North America, including most all of the United States and the southern half of Canada. It is generally found in moist to wet habitat. This is an unobtrusive annual herb producing a glandular stem up to about 30 centimeters tall. The lance-shaped to oval leaves are arranged oppositely about the stem. They are up to 5 centimeters long and sometimes toothed along the edges. The inflorescence is a raceme of nearly cylindrical tubular whitish flowers each about a centimeter long. At the base of each flower is a fringe of five pointed sepals. The fruit is a spherical capsule about half a centimeter wide.
Sphenosciadium is a monotypic genus of flowering plants in the carrot family containing the single species Sphenosciadium capitellatum, which is known by the common names woollyhead parsnip, ranger's buttons, button parsley, and swamp white heads.
Agave phillipsiana is a rare species of flowering plant in the asparagus family known by the common names Grand Canyon century plant and Phillips agave. It is endemic to Arizona in the United States, where it lives only in Grand Canyon National Park.
Moganopterus is an extinct genus of ctenochasmatid pterosaur from the Early Cretaceous of western Liaoning Province, China.
