This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol1", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Culms 8'-18' tall, erect, slender, smooth or scabrous. Sheaths usually inflated, about half as long as the inter-nodes; ligule very short; blades 1" wide or less, smooth and glabrous beneath, scabrous and hairy near the base above, attenuate into a slender involute point, the lower elongated, the upper 1' - 3' long, setaceous; panicles 3/4'-2' in length, the terminal one exserted or sometimes partially included, strict, the branches 1/2' long or less, erect, the lateral ones enclosed in the sheaths; spikelets 1 3/4"-2 1/4" long, the outer scales unequal, acuminate, smooth, the lower one shorter; third scale scabrous, especially toward the apex, about as long as the second and equalling or slightly exceeded by the very acute palet.
Sporobolus neglectus Nash, Bull. Torr. Club, 22: 464. 1895.
Culms 6'-12' tall, erect from a usually decumbent base, slender, often much branched, smooth and glabrous. Sheaths about half as long as the internodes, inflated; ligule very short; blades 1" wide or less at the base, smooth and glabrous beneath, scabrous and hairy near the base above, attenuate into a slender point, the lower elongated, the upper 1'-3' long, setaceous;terminal panicle 1'-2 1/2' in length, usually more or less included in the upper sheath, strict; lateral panicles enclosed in the sheaths; spikelets about 1 1/2" long, the outer scales acute, the lower one slightly shorter; third scale acute, glabrous, a little longer than the second and about equalling the acute palet.
In dry soil, New Brunswick to North Dakota, Virginia and Missouri. Aug.-Sept.
Culms 2°-5° tall, erect, simple, smooth and glabrous. Sheaths shorter than the internodes; liguie a mere ring, less than i" long, naked; blades 3'-15' long, 1"-2" wide at the base, attenuate into a long slender involute tip, smooth and glabrous beneath, scabrous above, or somewhat hairy at the base; panicle 2'-5' in length, linear, strict, its branches 1-2' long, appressed; spikelets 3"-4" long, the outer scales unequal, acute; third scale pubescent at the base, much longer than the second and greatly exceeded by the long-acuminate almost awned palet.
In dry soil, Connecticut to Missouri, south to Florida and Texas. Described and figured as S. asper in our first edition. Prairie-grass. Aug.-Sept.