Flora of North America species comparison

2-70 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.

1-13 cm long, 1-4 cm wide, erect, usually ovoid, open, becoming dense, occasionally reduced to 1 or 2 spikelets;

branches shorter than the spikelets, ascending to erect, straight or almost so.

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

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

(11)14-20(23) mm, lanceolate, terete to moderately laterally compressed;

florets 5-10, bases concealed at maturity;

rachilla internodes 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.

pilose or glabrous;

lower glumes 5-7 mm, 3-5-veined;

upper glumes 6.5-8 mm, 5-7-veined;

lemmas 6.5-11 mm long, 3-5 mm wide, lanceolate, chartaceous, antrorsely pilose to pubescent, or glabrous proximally or throughout, 7-9-veined, lateral veins prominently ribbed, rounded over the midvein, hyaline margins abruptly or bluntly angled, not inrolled at maturity, apices acute, bifid, teeth shorter than 1 mm;

awns 6-8 mm, usually arising less than 1.5 mm below the lemma apices, straight to recurved at maturity;

anthers 0.6-1.5 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.

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

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

sheaths densely, often retrorsely, pilose;

upper sheaths pubescent or glabrous;

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

blades 2-19 cm long, 1-4 mm wide, abaxial surfaces glabrous or hairy, adaxial surfaces hairy.

= 28.

= 28.