Lemmon’s Needlegrass

Achnatherum lemmonii var. lemmonii, commonly known as Lemmon’s Needlegrass, is a perennial grass species native to the western United States, particularly found in regions such as the Rocky Mountains and surrounding foothills. Its distribution extends from southern Montana to northern New Mexico, thriving in dry, well-drained soils, often in open grasslands, meadows, and along rocky slopes. This variety typically exhibits a growth habit characterized by its erect form, reaching heights of 30 to 90 centimeters (approximately 12 to 35 inches). The plant forms dense tufts or clumps, contributing to its overall structural integrity in its native habitat.

The leaves of Lemmon’s Needlegrass are narrow and elongated, measuring about 10 to 30 centimeters long and 2 to 5 millimeters wide, with a distinctive needle-like appearance that gives the species its common name. The flowering period occurs from late spring to early summer, during which the plant produces slender, elongated inflorescences known as spikelets. These spikelets are typically 5 to 10 centimeters long and feature a characteristic awn that can be up to 10 centimeters long, aiding in seed dispersal. The fruit is a caryopsis, which is a type of dry, one-seeded fruit that is adapted for wind dispersal, allowing the species to colonize new areas effectively.

Ecologically, Achnatherum lemmonii var. lemmonii plays a significant role in its native ecosystems by providing habitat and forage for various wildlife species, including herbivores. Its deep root system helps stabilize soil and prevent erosion, making it an important component of grassland restoration efforts. Additionally, this grass species is adapted to withstand periods of drought, with its narrow leaves reducing water loss through transpiration. This adaptation allows it to thrive in arid environments where moisture is limited, contributing to its resilience and ecological success in its native range.