Atriplex are C-plants, with a characteristic leaf anatomy (kranz anatomy). The genus "Atriplex" is distributed nearly worldwide from subtropical to temperate and to subarctic regions. Most species-rich are Australia, North America, South America and Eurasia. Many species are halophytes and are adapted to dry environments with salty soils. The genus evolved in Middle Miocene, the C-photosynthesis pathway developed about 14.1-10.9 million years ago, when the climate became increasingly dry. The genus diversified rapidly and spread over the continents. The C"Atriplex" colonized North America probably from Eurasia during the Middle/Late Miocene, about 9.8-8.8 million years ago, and later spread to South America.
Kalidium distributed from Southeast Europe to Southwest Asia and Central Asia to China. The plants are halophytes and grow in saline mudflats, on alkaline soils, at margins of alluvial fans, and at the shores of salt lakes. The genus "Kalidium" was first published in 1849 by Alfred Moquin-Tandon. "Kalidium foliatum" was chosen as lectotype of the genus. A synonym is "Kalidiopsis" . The genus comprises six species: Kalidium Kalidium is a genus of flowering plants in the plant family Amaranthaceae. The species are shrubby halophytes distributed in Southeast Europe, Southwest Asia and Central Asia to China. The species of "Kalidium" grow