Flora of North America species comparison

20-110 cm, erect or ascending.

5-60 cm, erect.

pilose;

ligules 0.5-1 mm, hairy, obtuse;

blades 3-13 cm long, 2-4 mm wide.

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

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

2-10 cm long, 1.5-3 cm wide, erect, contracted or loose;

branches shorter than the spikelets, ascending, slightly curved or straight.

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.

6-15 mm, lanceolate, shiny, terete to moderately laterally compressed;

florets 5-12, 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.

glabrous;

lower glumes 4-4.6 mm, 3-5-veined;

upper glumes 5.2-5.4 mm, 7-veined;

lemmas 4.5-6.5 mm long, 1.5-1.7 mm wide, elliptic, glabrous, distinctly 7-veined, rounded over the midvein, margins broadly hyaline, sharply angled, not inrolled at maturity, apices notched, notch at least 0.6 mm deep;

awns 2-6 mm, straight, arising from the base of the apical notch but less than 1.5 mm below the lemma apices;

anthers 0.5-2 mm.

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

longer than 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.

= 28.

= 28.