Much like no. 11 [Sporobolus vaginiflorus (A. Gray) A. W. Wood]; lower sheaths generally glabrous; panicle rarely exsert, usually surpassed by the uppermost blade; spikelets smaller, the glumes and lemmas less acuminate and proportionately wider; first glume 1.5–2.4 mm, the second 1.7–2.7 mm; lemma 1-nerved, 1.5–3 mm, glabrous, about equaling the wide, acute, split palea; grain falling free at maturity, and freeing the seed when moistened; 2n=36. Dry sterile or sandy soil; Me. and s. Que. to N.D., s. to N.J., Tenn., La., and Tex.; also Wash. and Ariz.
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