PlantaeDB Logo
Login Sign-up

Genus Agropyron in Family Poaceae

In botanical taxonomy, a genus (plural genera) is a rank used to group closely related species within a family. In the hierarchy, genus sits below family and above species.

Genera are defined by shared morphological, anatomical, and genetic characteristics (for example, features of flowers, fruits, seeds, or leaves) that indicate a close evolutionary relationship among the species they contain.

Each genus can include one or more species. Examples include Rosa (roses) and Solanum (nightshades, including tomato and eggplant).

Do you wish to read more about plant taxonomy? Click here!

Genus Description

Suggest a correction!

Agropyron (Gaertn.) is a small genus in the grass family Poaceae, tribe Triticeae, with approximately twelve to fifteen accepted species (POWO & WFO, 2024). It occurs throughout temperate Eurasia, from western Europe to Siberia and Central Asia, and has been introduced to North America as a forage and soil‑stabilising grass. The type species is Agropyron cristatum (L.) Gaertn., the crested wheatgrass, which defines the traditional concept of the genus.

Members are perennial, tufted or shortly rhizomatous grasses with linear, flat or rolled leaf blades and a membranous ligule. The inflorescence is a dense spike bearing laterally compressed, sessile spikelets arranged in two rows; each spikelet typically bears three to seven florets. Glumes are subequal, lemmas may be awned or awnless, and the fruit is a typical Poaceae caryopsis with basal placentation.

The centre of diversity lies in the Central Asian steppe, especially Mongolia and southern Siberia, where several species are regional endemics. Typical habitats are semi‑arid grasslands, open meadows and mountain steppes up to about 3000 m elevation. A few populations extend into the European Alps and the Carpathians, reflecting a boreal‑temperate distribution pattern.

Like most Triticeae, Agropyron is wind‑pollinated; seeds are gravity‑dispersed and occasionally transported by animals. It is a cool‑season perennial with early spring growth and a deep root system that aids drought tolerance. The base chromosome number is x = 7, and most taxa are diploid (2n = 14) or tetraploid (2n = 28) (Fedorov, 1987).

Recent phylogenetic work has refined the circumscription of Agropyron. Saarela et al. (2020) demonstrate that the genus forms a monophyletic clade distinct from Elymus and Pseudoroegneria, while Liu et al. (2022) propose transferring many former Agropyron species to those genera. Some authors (e.g., Dewey, 1984) historically placed A. cristatum* in Elymus, and earlier treatments proposed subgeneric divisions (e.g., subgenus Stenostachys), although these have not been consistently adopted. Current consensus (POWO & WFO, 2024) supports a restricted Agropyron but acknowledges that species boundaries remain unsettled.

Several species, notably A. cristatum* and A. desertorum, are widely cultivated for pasture, erosion control and ornamental use; some have become naturalised and occasionally invasive outside their native range.

Conservation concerns focus on habitat loss in steppe regions, which threatens the few narrowly endemic taxa. Continued field surveys and molecular studies are essential to clarify species limits and to inform future protection strategies.

Pick a Species to see its components: