Eragrostis cilianensis, commonly known as stinkgrass, is an annual grass species recognized for its distinctive odor and widespread distribution. This plant is a member of the grass family, Poaceae, and is often found in disturbed areas and agricultural settings. Its significance lies primarily in its role as a common weed in various ecosystems and its ability to thrive in human-altered landscapes. Physically, Eragrostis cilianensis is characterized by its tufted growth habit, typically reaching heights of 10 to 60 centimeters. The stems are erect or geniculately ascending, often branching from the base. The leaves are flat, linear, and can measure up to 20 centimeters long and 3 to 6 millimeters wide, with a rough texture on the upper surface and smooth on the lower. A notable feature of the leaves and inflorescence is their characteristic unpleasant odor when crushed, which gives the plant its common name. The inflorescence is a panicle, which is open and spreading, often appearing somewhat pyramidal, and can be up to 15 centimeters long. The spikelets are ovate to oblong, 4 to 12 millimeters long and 2 to 4 millimeters wide, and contain 5 to 15 florets. Each spikelet is typically greenish or purplish. The caryopses, or grains, are oblong and reddish-brown, measuring about 0.7 to 1 millimeter long. The native range of Eragrostis cilianensis is believed to be in the Mediterranean region, but it has naturalized and become widely distributed across temperate and tropical regions worldwide, including North America, Europe, Asia, Africa, and Australia. It prefers open, disturbed habitats such as roadsides, waste areas, cultivated fields, gardens, and sandy or gravelly soils. While not typically cultivated, it can tolerate a range of soil types, provided they are well-drained, and prefers full sun. Eragrostis cilianensis is primarily recognized as a weed in agricultural systems, particularly in grain crops, pastures, and lawns, where it competes for resources. Its rapid growth and prolific seed production contribute to its success as a colonizer of disturbed sites. Ecologically, it provides some forage for livestock, though its palatability is often reduced by its odor and texture. There is no established ornamental, medicinal, culinary, or significant economic importance attributed to this species. An interesting characteristic of Eragrostis cilianensis is its ability to tolerate saline soils, which allows it to colonize areas where many other plants struggle to survive. The distinctive smell, while often considered unpleasant, is a key identifying feature that helps distinguish it from other grass species. Its seeds are dispersed by wind, water, and human activities, facilitating its extensive global spread.