IUCN threat status:

Not evaluated

Comprehensive Description

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Description

This introduced grass is a summer annual that branches at the base to form a small tuft of leafy culms. In open areas, the slender culms are erect, ascending, or widely spreading; they are 1½–2' long, terete, light green, and hairless. The blades of the alternate leaves are up to 6" long and ½" across; they are light to medium dull green and hairless. Their margins are usually flat and entire, occasionally curving upward and becoming minutely wavy. The open sheaths are light to medium green like the leaves, but slightly more shiny; they wrap around the culms loosely. At the base, the sheaths are often purplish, while their margins are ciliate. At the junction of each blade and sheath, the ligule is defined by a ring of white hairs. Each culm terminates in a spike-like panicle of florets about 2-4" long and ½" across. The light green panicle has a dense and cylindrical appearance; it is either straight or slightly nodding. The exterior of each panicle is surrounded with ascending bristles that are light green or purple. The lateral branches of the panicle are very short, terminating in individual spikelets. Each fertile spikelet consists of a single floret, a pair of lemmas, and a pair of tiny glumes at the bottom; it is 1.5–2.5 mm. in length (excluding the bristles, which are 3-5 times longer). Each spikelet has 1-3 bristles; these bristles originate from an area directly underneath the spikelet. One lemma extends the full length of the spikelet, while the other lemma is about one-half the length of the spikelet. Some spikelets may fail to produce any florets or grains. The blooming period can occur from late spring to early fall, but lasts only 1-3 weeks for each plant. The florets are wind-pollinated. Each fertile floret produces a single grain about 1.5 mm. long and half as much across. Individual grains are ovoid in shape, flattened on one side, tapered at both ends, and bone-colored to pale brown. The grains fall from the seedhead when they are ripe, while the bristles remain attached. The root system is shallow and fibrous. This grass reproduces by reseeding itself.

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Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© John Hilty

Source: Illinois Wildflowers

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