Panicle 4–18 cm. long; involucre 6–9 mm. long, connate for 1/3–2/3 its length to form a cup; inner spines flattened, pubescent on the face, ciliate on the margins, aciculate at the apex; outer bristles filiform, rarely much reduced.
Culms 20–100 cm. high, decumbent or ascending.
Spikelets 2(3) per bur, 4–6 mm. long.
Superior lemma coriaceous.
Annual.