agrostis

Agrostis is a genus of grasses in the family Poaceae, commonly known as bentgrasses. The genus comprises roughly 80 to 100 species, distributed mainly in temperate regions of the Northern Hemisphere, with a few species extending into montane or subtropical zones. They are perennial grasses that can be tufted, creeping, or rhizomatous, depending on the species.

Leaves are narrow and fastened with a membranous ligule. The flowering stems bear an open, delicate panicle with small spikelets. Each spikelet typically has two glumes and one to several florets. Agrostis species are adapted to cool-season growth and show variation in habitat preference, from moist meadows to damp grasslands and wetlands.

Habitat and ecology: Bentgrasses occur in a range of moist to mesic environments, tolerating a variety of soil types from acidic to calcareous. They are valued for their fine texture, density, and winter hardiness in temperate climates. Some species are more drought-sensitive and recover slowly after wear, which influences their use in turf applications.

Uses: Several species are prominent in turf and landscape contexts. Notable turf species include Agrostis capillaris (common bentgrass), Agrostis gigantea (redtop), and Agrostis stolonifera (creeping bentgrass). These are used on lawns, golf course greens and fairways, and in seed mixtures for erosion control and restoration. Some Agrostis species have naturalized outside their native ranges and can become weedy in disturbed habitats.

Taxonomy and notes: Agrostis represents a widespread group within Poaceae and includes many closely related bentgrasses. The genus has been the focus of breeding programs aiming to improve turf quality, disease resistance, and environmental tolerance.