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Vulpia fasciculata is an annual herb with erect or decumbent, and solitary, or caespitose culms that reach up to 10–60 cm long. The leaf-sheaths are smooth, and glabrous on surface. The leaf-blades are 1–10 cm long; 1–3 mm wide, flat, or involute, firm, or flaccid with ribbed; pubescent and adaxially hairy surface. The inflorescence is a contracted, oblong, and branched panicle that reaches up to 2–12 cm long. The spikelets are solitary; fertile spikelets are oblong, or cuneate, laterally compressed and comprise 2–3 fertile florets, with diminished florets at the apex. The glumes are shorter than spikelet; the lower glume is ovate, and membranous, with acute apex; while the upper glume is lanceolate with acuminate and awned apex. The fruit is a caryopsis with adherent pericarp.