The Torrey pine is a rare pine species in California, United States. It is a critically endangered species growing only in coastal San Diego County, and on Santa Rosa Island, offshore from Santa Barbara in Santa Barbara County. The Torrey pine is endemic to the California coastal sage and chaparral ecoregion.
Hesperocyparis arizonica, the Arizona cypress, is a North American species of tree in the cypress family Cupressaceae, native to the southwestern United States and Mexico. Populations may be scattered rather than in large, dense stands.
Ephedra is a genus of gymnosperm shrubs. The various species of Ephedra are widespread in many arid regions of the world, ranging across southwestern North America, southern Europe, northern Africa, southwest and central Asia, northern China and western South America. It is the only extant genus in its family, Ephedraceae, and order, Ephedrales, and one of the three living members of the division Gnetophyta alongside Gnetum and Welwitschia.
Hymenoxys is a genus of plants in the sunflower family, native to North and South America. It was named by Alexandre Henri Gabriel de Cassini in 1828.
Neltuma glandulosa, formerly Prosopis glandulosa, commonly known as honey mesquite, is a species of small to medium-sized, thorny shrub or tree in the legume family (Fabaceae).
Opuntia engelmannii is a prickly pear common across the south-central and Southwestern United States and northern Mexico. It goes by a variety of common names, including desert prickly pear, discus prickly pear, Engelmann's prickly pear in the US, and nopal, abrojo, joconostle, and vela de coyote in Mexico.
Muhlenbergia is a genus of plants in the grass family.
Amsonia tomentosa is a species of flowering plant native to the southwestern United States and northern Mexico (Chihuahua). Its common names include woolly bluestar and gray amsonia.
Ephedra trifurca is a species of Ephedra known by the common names longleaf jointfir and Mexican tea.
Ephedra fasciculata is a species of plant in the Ephedraceae family. Common names are Arizona ephedra, Arizona jointfir, and desert Mormon-tea.
Ephedra przewalskii is a species of Ephedra that is native to Central Asia, Mongolia, Pakistan, and parts of China.
Ephedra multiflora is a species of Ephedra that is native to northern Chile and Northwest Argentina.
Ephedra cutleri, the Navajo ephedra or Cutler's jointfir, is a species of Ephedra that is native to the Southwestern United States.
Tetraneuris, commonly known as four-nerve daisy or bitterweed, is a genus of North American plants in the sneezeweed tribe within the daisy family.
Hesperidanthus argillaceus, syn. Schoenocrambe argillacea, is a species of flowering plant in the mustard family, known by the common names clay reed-mustard, Uinta Basin plainsmustard, and clay thelypody.
Gutierrezia texana is a North American species of flowering plant in the family Asteraceae known by the common name Texas snakeweed. It is native to the south-central United States and northern Mexico as far south as Guanajuato and Hidalgo.
Dieteria asteroides, the fall tansyaster, is a North American species of plants in the sunflower family. It is native to the southwestern United States and northern Mexico.
Haploesthes greggii, common name false broomweed, is a North American species of flowering plants in the family Asteraceae. It grows in northeastern Mexico and in the south-central and southwestern United States.
Heterotheca fulcrata, known by the common name rockyscree false goldenaster, is a North American species of flowering plant in the family Asteraceae. It has been found in northern Mexico and in the western United States.
Ephedra coryi, also known as Cory's joint-fir, is a rare, reed-like gymnosperm native to sandy, semi-arid areas of the North American South and Southwest.
