Astragalus purshii is a species of milkvetch known by the common names woollypod milkvetch and Pursh's milkvetch. It is native to much of western North America, including the southwestern provinces of Canada and the northwestern United States, where it is known from many types of habitat. This is a small perennial herb forming clumps on the ground no taller than 14 centimeters. The leaves are up to 15 centimeters long and are made up of many oval or rounded leaflets. Stems and leaflets are coated in woolly white hairs. The flower cluster is a cluster of 1 to 11 pink, purple, or white flowers each between 1 and 3 centimeters long. The fruit is a legume pod up to 3 centimeters long which is coated densely in thick white hairs.

Pursh's Milk Vetch (Astragalus purshii var. lectulus) is a native perennial herb that grows in Northern, Southern and Central California, primarily in the High Sierra Nevada, the Transverse Range and Sierra Nevada East regions. It tends to grow in dry flats and slopes, at elevations from 5900-11000 feet.

Pursh's Milk Vetch (Astragalus purshii var. tinctus) is a native perennial herb that grows in northern, southern and central California. It tends to grow in dry flats and slopes, at elevations from 1500-9500 feet.

Astragalus pycnostachyus is a species of milkvetch known by the common name marsh milkvetch. It is endemic to the coastline of California, where it grows in wet saline habitat such as marshes. The marsh milkvetch is a perennial herb forming a thick erect clump of hollow, woolly stems 40 to 90 centimeters tall. The leaves are up to 15 centimeters long and are made up of many narrow oval-shaped leaflets. The inflorescence is a cluster of many whitish to greenish flowers each up to a centimeter in length. The fruit is an inflated, papery legume pod with a small hooked beak at the tip. Varieties: The species has two named Varieties: Astragalus pycnostachyus var. lanosissimus - Ventura marsh milkvetch, now endemic to the Oxnard Plain in Ventura County, with only one population within Oxnard. The single extant population of this rare plant variety is now fenced and protected. The variety is treated as an endangered species on the federal level. Threats to its existence include near-total loss of habitat, infestation by weevils, cucumber mosaic virus infection, competition from non-native plants such as ice plant, and herbivory by the milk snail Otala lactea. Astragalus pycnostachyus var. pycnostachyus - marsh milk vetch, primarily found in the San Francisco Bay Area.

Astragalus pycnostachyus var. lanosissimus, the Ventura marsh milk-vetch is a short-lived, herbaceous perennial in the pea family Fabaceae,Historically, Astragalus pycnostachyus var. lanosissimus or Ventura marsh milk-vetch occurred in back dune habitat and coastal meadows, and near coastal salt marshes from Ventura County to Orange County. Over the last century seven historical occurrences were known to exist. The species was extirpated from these sites and was therefore thought to be extinct until it was rediscovered in June 1997 by a USFWS biologist at a proposed development site. It had only been seen twice in the last century. Today, only this one population is known to exist near the City of Oxnard in Ventura County, all within a 2,854 square feet (265. 1 m2) area (less than 0. 6 of an acre). The population occurs on disturbed coastal backdunes at the edge of the Oxnard Plain on fill material at a closed oil-waste dump site. Since 1997 between 192 and 374 individual plants have been observed on the site. Most of these individuals are seedlings or small juveniles. Southern California coastal wetland habitats have declined by 80-90% and those remaining are frequently degraded. Very little is known about the ecological requirements of this species. This only known population of Ventura marsh milk-vetch is threatened by predation and potential habitat modification and may be susceptible to alterations in its hydrologic regime and competition from non-native plant species. The DFG is working closely with the landowner, the USFWS and other interested parties to identify areas that may be suitable for introducing Ventura marsh milk-vetch as part of recovery for the species. Greenhouse studies on this species are ongoing, as well as research to learn more about the ecological requirements of this species.

Astragalus rattanii is a species of milkvetch known by the common name Rattan's milkvetch. It is endemic to northern California, where it grows in the North Coast Ranges. This is a hairy annual herb with thin stems growing up to 30 centimeters long. The leaves are a few centimeters long and made up of a few oval-shaped leaflets.

Astragalus sabulonum is a species of milkvetch known by the common name gravel milkvetch. It is native to the Southwestern United States and California, from desert to mountain habitats. This is a hairy annual herb with stems up to about 26 centimeters long. Leaves are a few centimeters long and are made up of several hairy oval-shaped leaflets. The inflorescence is an open array of 2 to 7 off-white to pale lilac flowers each less than a centimeter in length.

Astragalus shevockii is a rare species of milkvetch known by the common names Little Kern milkvetch and Shevock's milkvetch. It is endemic to Tulare County, California, where it grows in the High Sierra, generally on granite-based soils in Jeffrey pine forests. Astragalus shevockii is a slender perennial herb producing thin, hard, hairy stems up to 35 centimeters long. The leaves are a few centimeters in length and are made up of several widely spaced oval-shaped leaflets. The inflorescence is an open cluster of up to 13 cream-colored flowers each about a centimeter long. Astragalus shevockii is a slender perennial herb producing thin, hard, hairy stems up to 35 centimeters long. The leaves are a few centimeters in length and are made up of several widely spaced oval-shaped leaflets. The inflorescence is an open cluster of up to 13 cream-colored flowers each about a centimeter long. The fruit is a hairy, papery legume pod 1 to 3 centimeters long.

Astragalus subvestitus is a species of milkvetch known by the common name Kern County milkvetch. It is endemic to California, where it grows in sagebrush habitat on the slopes of the Sierra Nevada in Kern and Tulare Counties. It is endemic to California, where it grows in sagebrush habitat on the slopes of the Sierra Nevada in Kern and Tulare Counties. Astragalus subvestitus is small, hairy, mat-forming perennial herb producing stems no longer than 8 centimeters. The leaves are a few centimeters long and made up of several hairy oval-shaped leaflets. The small inflorescence holds a few purple-tinged white flowers each just over a centimeter in length. The fruit is a papery legume pod covered in short, curly white hairs and bearing a triangular beak at the tip.

Astragalus tener is a species of milkvetch known by the common name alkali milkvetch. It is endemic to California, where it grows in both coastal and inland areas such as the Central Valley, especially in moist places. This is an annual herb producing upright stems up to 30 centimeters tall. The leaves are up to nine centimeters in length and made up of several lance-shaped to oval leaflets. The inflorescence is a dense cluster of pinkish-purple white-smudged flowers. The fruit is a narrow legume pod up to five centimeters long and usually containing two smooth seeds. Varieties: There are three varieties of this species. One, the coastal dunes milkvetch, Astragalus tener var. titi, is a rare plant treated as an endangered species on the federal level. It is probably now limited to coastal Monterey County, having been extirpated from its previous range in southern California. An example occurrence of Astragalus tener is within the two extant forests of Monterey Cypress, Cupressus Macrocarpus, in Monterey County, California.

Astragalus tidestromii is a species of milkvetch known by the common name Tidestrøm's milkvetch. It is native to the Mojave Desert of California and Nevada, where it grows in limestone gravel soils. The plant is named for the botanist Ivar Frederick Tidestrøm. This is a tuft or clump forming perennial herb with absent or very short stems. The leaves are up to 15 centimeters long and made up of oval-shaped to rounded leaflets. The herbage is coated in a shaggy layer of hairs. The inflorescence is an open cluster of flowers of light to deep purple, tipped with darker purple. This is a tuft or clump forming perennial herb with absent or very short stems. The leaves are up to 15 centimeters long and made up of oval-shaped to rounded leaflets. The herbage is coated in a shaggy layer of hairs. The inflorescence is an open cluster of flowers of light to deep purple, tipped with darker purple. The fruit is a flattened legume pod which has a drastic curved shape, sometimes curving into a complete ring. It is leathery and hairy in texture and may reach 5. 5 centimeters in length.

Astragalus traskiae is a rare species of milkvetch known by the common name Trask's milkvetch. It is endemic to the southern Channel Islands of California, where it is known only from Santa Barbara Island and San Nicolas Island. Astragalus traskiae is branching perennial herb with hairy stems 10 to 40 centimeters tall. The leaves are up to 10 centimeters long and made up of several hairy oval-shaped leaflets. The inflorescence holds 12 to 30 cream-colored flowers. Astragalus traskiae is branching perennial herb with hairy stems 10 to 40 centimeters tall. The leaves are up to 10 centimeters long and made up of several hairy oval-shaped leaflets. The inflorescence holds 12 to 30 cream-colored flowers. The fruit is a legume pod which is fleshy when new and dries to a leathery texture. The pod is generally just over a centimeter long.

Astragalus tricarinatus is a rare species of milkvetch known by the common name triplerib milkvetch, or triple-ribbed milkvetch. It is endemic to California, where it can be found in the region where the San Bernardino Mountains meet the Mojave Desert and the Colorado Desert. It grows in desert scrub and expanses of rock litter amongst stands of Joshua trees. The plant is known from only one location and there were twenty individuals remaining there in 1998, when it was federally listed as an endangered species. This is a perennial herb growing in clumps up to about 25 centimeters tall. The leaves are up to 20 centimeters long and made up of several silvery-green hairy leaflets. The inflorescence holds 5 to 15 cream-colored flowers each about 2 centimeters in length. The fruit is a flat legume pod up to about 4 centimeters long. The pod is curved and has three distinct ribs.

Astragalus trichopodus is a species of legume known by the common name Santa Barbara milk vetch. It is native to southern California and Baja California, where it grows in several types of open habitat. This is a robust perennial herb producing a branching stem up to about a meter in maximum height. The hairy stem is lined with many leaves each up to 20 centimeters long which are made up of several pairs of widely-spaced lance-shaped leaflets each up to 2.5 centimeters in length. The flower cluster is a raceme of up to 50 flowers which are cream colored and sometimes tinted with light purple. Each flower is 2 or 3 centimeters long including its tubular base of sepals. The fruit is a laterally compressed, slightly inflated legume pod up to 4 or 5 centimeters long which dries to a papery texture. The fruits hang in bunches where they develop from the flower cluster. Each pod contains many seeds.

Santa Barbara Milk Vetch (Astragalus trichopodus var. lonchus) is a native perennial herb that grows in Northern, Southern and Central California, primarily in the South Coast, the Channel Islands and Peninsular Range regions. It tends to grow in grassy places, at elevations from 0-1000 feet.

Astragalus webberi is a rare species of milkvetch known by the common name Webber's milkvetch. It is endemic to the coniferous forests in the Sierra Nevada, in Plumas County, eastern California. Astragalus webberi is a spreading perennial herb with stems up to 50 centimeters long, and part of the stem growing underground. The leaves are up to 15 centimeters long and made up of many oval-shaped leaflets. The inflorescence bears 6 to 14 cream colored flowers, each between one and two centimeters long. The fruit is a leathery legume pod 2 to 3. 5 centimeters long. Astragalus webberi is a spreading perennial herb with stems up to 50 centimeters long, and part of the stem growing underground. The leaves are up to 15 centimeters long and made up of many oval-shaped leaflets. The inflorescence bears 6 to 14 cream colored flowers, each between one and two centimeters long. The fruit is a leathery legume pod 2 to 3. 5 centimeters long.

Balloonpod Milkvetch (Astragalus whitneyi) is a native perennial herb that grows in northern, southern and central California. It tends to grow in open sandy gravelly, or rocky places, at elevations from 2500-12000 feet.

Whitney's Milk Vetch (Astragalus whitneyi var. confusus) is a native perennial herb that grows in Northern California, primarily in the Warner Mountains, the High Sierra Nevada and Modoc Plateau regions. It tends to grow in open sandy, gravelly or rocky places, at elevations from 4400-7900 feet.

Athysanus is a monotypic genus whose only species is Athysanus pusillus, the common sandweed. It is an annual herb with long, spindly stems on which grow small, unassuming white flowers. The tiny fruits that emerge from the flowers are flat, circular, green, and fringed with prominent white hairs. It is native to the western United States and into British Columbia.

Atriplex argentea is a species of saltbush known by the common names silverscale saltbush and silver orache. It is native to western North America from southern Canada to northern Mexico, where it grows in many types of habitat, generally on saline soils. This is an annual herb producing branching stems which spread out low to the ground or reach erect to maximum heights approaching 80 centimeters. The leaves are triangular to roughly oval in shape and 1 to 4 centimeters long. The stems and leaves are coated in gray scales. The flower clusters are rough clusters of tiny flowers, with male and female flowers in separate clusters.

Silverscale (Atriplex argentea var. expansa) is a native annual herb that grows in northern, southern and central California. It tends to grow in saline areas, at elevations from 0-3300 feet.

Atriplex canescens (Chamiso, Chamiza, Four wing saltbush, Four-wing saltbush, Fourwing saltbush) is a species of evergreen shrub in the Amaranthaceae family, which is native to the western United States. Fourwing saltbush has a highly variable form, and readily hybridizes with several other species in the Atriplex genus. The degree of polyploidy also results in variations in form. Its height can vary from 1 foot to 10 feet, but 2 to 4 feet is most common. The leaves are thin and 0.5 to 2 inches long. It is most readily identified by its fruits, which have four wings at roughly 90 degree angles and are densely packed on long stems. The fruit stem resembles a mass of corn flakes.

Atriplex canscens is a great bird plant. Best to plant in dry salty soils. Susceptible to root rot unless drought or salt stressed.

Wingscale (Atriplex canescens ssp. canescens) is a native shrub that grows in northern, southern and central California. It tends to grow in clay or gravelly slopes, at elevations from 0-7900 feet.

Narow Leaf Shadscale (Atriplex canescens ssp. linearis) is a native shrub that grows in Southern and Central California, primarily in the Transverse Range and Sonoran Desert regions. It tends to grow in clay or gravelly slopes, at elevations from 0-7900 feet.

Atriplex confertifolia (Shadscale) is a species of evergreen shrub in the Chenopodiaceae family, which is native to the western United States. Shadscale is a common, often dominant, shrub in the lowest and driest areas of the Great Basin. It prefers sandy, well-drained soils and it is tolerant of moderately saline conditions. Its height varies from 1 to 3 feet. Compared to fourwing saltbush, shadscale has shorter and wider leaves and the fruit does not have four wings (although it may have two wings in a "V" shape).

Atriplex cordulata is a species of saltbush known by the common names heartscale and heart-leaf orache. It is endemic to the Central Valley and its San Joaquin Valley of California, where it grows in areas of saline and alkaline soils. Heart-leaf orache is an annual herb producing one or more erect stems to heights between 10 and 50 centimeters. The branches are scaly gray and have woolly fibers toward the ends. The gray scaly leaves are no bigger than 1. 5 centimeters long and most have heart-shaped bases. Heart-leaf orache is an annual herb producing one or more erect stems to heights between 10 and 50 centimeters. The branches are scaly gray and have woolly fibers toward the ends. The gray scaly leaves are no bigger than 1. 5 centimeters long and most have heart-shaped bases. The plant has male and female inflorescences which are small hard clusters of flowers. The reddish brown seeds are about 2 millimeters wide.

Atriplex coronata is a species of saltbush known by the common name crownscale. It is endemic to California. The halophyte plant grows in areas of saline and alkaline soils in the Central Valley and nearby slopes of the Inner California Coast Ranges in Central California; and the South Coast region of Southern California. Atriplex coronata is an annual herb producing stiff erect or leaning straw-colored stems up to about 30 centimeters tall. The gray scaly leaves are one or two centimeters long. The flowers are generally oval shaped. The seeds are just over a millimeter long. Varieties: There are two or three varieties of this species. They include:Atriplex coronata var. notatior - San Jacinto Valley crownscale, limited to the San Jacinto River valley in western Riverside County. It is as an endangered species since being listed on the federal level in 1998.

Atriplex coulteri is a species of saltbush known by the common names Coulter's saltbush and Coulter's orache. It is native to coastal southern California and northern Baja California, where it is quite rare. It grows in areas of saline and alkaline soils, such as ocean bluffs.

Atriplex depressa is a species of saltbush known by the common names brittlescale and depressed orache. It is sometimes treated as a variety of Atriplex parishii. It is endemic to the Central Valley of California, where it grows in areas with saline and alkaline soils.

Atriplex elegans is a species of saltbush known by the common name wheelscale saltbush, Mecca orach,:270 or wheelscale. :270 It is native to the Southwestern United States, and northern Mexico, where it grows in areas of saline or alkaline soils, such as alkali flats and desert dry lakebeds. This is an annual herb with a scaly branching stem which spreads somewhat upright to heights between 10 and 50 centimeters. The crusty whitish leaves are narrowly oval in shape, sometimes toothed along the edges, and less than 3 centimeters long. The inflorescences bear separate male and female flowers which are in small, hard clusters. This is an annual herb with a scaly branching stem which spreads somewhat upright to heights between 10 and 50 centimeters. The crusty whitish leaves are narrowly oval in shape, sometimes toothed along the edges, and less than 3 centimeters long. The inflorescences bear separate male and female flowers which are in small, hard clusters.