Flora of North America species comparison

20-110 cm, erect or ascending.

20-60 cm, erect or geniculately ascending.

4-16 cm long, 2-3 cm wide, erect, open;

branches sometimes longer than the spikelets, slender, usually ascending, slightly curved or straight.

7-20 cm long, 4-8 cm wide, racemose, open, nodding, often with few spikelets, usually secund;

branches sometimes longer than the spikelets, ascending-spreading, flexuous, slightly curved, usually with 1 spikelet.

12-20 mm, lanceolate, terete to moderately laterally compressed;

florets 5-6, bases concealed at maturity;

rachilla internodes 1-1.5 mm, concealed at maturity.

15-70 mm, broadly oblong or ovate-lanceolate, terete to moderately laterally compressed;

florets 8-30, bases concealed at maturity;

rachilla internodes concealed at maturity.

smooth to scabrous;

lower glumes 4-6 mm, (3)5-veined;

upper glumes 4-7 mm, 7-veined;

lemmas 6.5-8 mm long, 3-4.5 mm wide, elliptic to lanceolate, coriaceous, backs smooth, distinctly 7(9)-veined, not ribbed, rounded over the midvein, margins scabrous, rounded, not inrolled at maturity, apices acute to obtuse, bifid, teeth shorter than 1 mm;

awns 5-9 mm, all more or less equal in length, straight, arising less than 1.5 mm below the lemma apices;

anthers 1.5-3 mm.

smooth or scabrous;

lower glumes 4.5-7 mm, 3-5(7)-veined;

upper glumes 6-8 mm, 7-veined;

lemmas 8-11 mm long, 2-2.4 mm wide, lanceolate, chartaceous, smooth or scabridulous, 7-9-veined, rounded over the midvein, margins hyaline, 0.6-0.9 mm wide, strongly angled above the middle, not inrolled at maturity, apices acute, bifid, teeth shorter than 1 mm;

awns 8-10 mm, flattened and sometimes twisted at the base, divaricate at maturity, arising 1.5 mm or more below the lemma apices;

anthers 1-1.3 mm.

shorter than the paleas, thin, weakly inrolled or flat.

equaling the paleas, thin, weakly inrolled or flat.

sheaths densely hairy, hairs stiff, often retrorse;

upper sheaths glabrous or pubescent;

ligules 1-2 mm, glabrous or hairy, erose;

blades 7-18 cm long, 1-4 mm wide, pilose on both surfaces.

sheaths densely pilose;

ligules 1-1.5 mm, hairy, obtuse, erose, ciliolate;

blades 5-15 cm long, 4-6 mm wide, densely pilose on both surfaces.

= 28.

= 14.