Agropyron is a genus of perennial grasses in the family Poaceae (order Poales), native to temperate Eurasia and widely naturalized in North America. Species in the genus are commonly known as wheatgrasses. The genus ranges from Spain and Morocco in the west across Central Asia to Korea and the Russian Far East, with individual species occupying steppes, semi-arid grasslands, and mountain foothills from the Caucasus and Crimea to Mongolia, Siberia, and the western Himalayas.
Agropyron species are tufted, rhizomatous grasses with flat or inrolled leaf blades and spike-like inflorescences bearing sessile spikelets arranged in two rows along the rachis — the characteristic form shared across most wheatgrasses. The genus as currently circumscribed is considerably narrower than it once was: many formerly included species have been transferred to related genera such as Elymus, Thinopyrum, Leymus, Kengyilia, and Vulpia as molecular and morphological work has refined tribal boundaries within Poaceae.
The best-known member is Agropyron cristatum (crested wheatgrass), a hardy, drought-tolerant species widely introduced across western North America for rangeland stabilization and forage. Other species, such as A. desertorum (desert wheatgrass) and A. fragile (Siberian wheatgrass), have similarly been used in revegetation and erosion-control programs in arid regions.
Distribution
Agropyron is native to Europe and temperate Asia, with species distributed from Spain and Morocco in the west to Korea and Khabarovsk in the east, and south to the western Himalayas. Several species — most prominently A. cristatum, A. desertorum, and A. fragile — have naturalized widely across western and central North America following deliberate introduction for rangeland use.
Taxonomy Notes
The genus has been substantially revised since the mid-twentieth century. Many species once placed in Agropyron have been transferred to segregate genera — including Elymus, Thinopyrum, Leymus, Kengyilia, and Vulpia — based on cytological and molecular evidence. In its current, stricter circumscription, Agropyron comprises roughly 13 species centred on the Eurasian steppe zone.
