Flora of North America species comparison

20-110 cm, erect or ascending.

50-150 cm, erect or basally decumbent, often rooting from the lower nodes;

nodes 3-5(6), pubescent;

internodes usually glabrous, often puberulent-pubescent just below the nodes, rarely puberulent throughout.

glabrous, sometimes slightly pubescent near the throat, sometimes with hairs in the auricular position;

auricles absent or vestigial on the basal leaves;

ligules 2-4.2 mm, glabrous, obtuse, lacerate;

blades 13-26 cm long, 4-10 mm wide, light green or glaucous, flat, glabrous, sometimes scabrous on both surfaces.

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

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

10-20 cm, open, nodding;

branches ascending to spreading, often drooping.

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.

23-35 mm, elliptic to lanceolate, terete to moderately laterally compressed, with 5-11 florets.

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, sometimes scabrous, margins often bronze-tinged;

lower glumes 6-9 mm, 3-veined;

upper glumes 8-12 mm, 5-veined;

lemmas 12-16 mm, elliptic to lanceolate, rounded over the midvein, backs sparsely pilose, pubescent, or scabrous, margins densely pilose, at least on the lower 1/2, often bronze-tinged, apices acute to obtuse, entire, rarely slightly emarginate, lobes shorter than 1 mm;

awns 4-6 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 3.5-5 mm.

shorter 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.

= 14.