Flora of North America species comparison

20-110 cm, erect or ascending.

30-90 cm, erect or decumbent, forming distinct clumps;

nodes 2-3, glabrous or puberulent;

internodes glabrous or puberulent.

glabrous or with hairs;

auricles to 1 mm on the lower leaves;

ligules 0.4-1.0 mm, glabrous or ciliate, truncate, erose;

blades 10-20 cm long, 2-3 mm wide, scabridulous, glabrous or sparsely pilose, margins sometimes ciliate.

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

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

8-20 cm long, lax;

branches scabridulous, with 1-2 spikelets.

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.

20-32 mm, lanceolate, becoming cuneate, with 5-8 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 scabridulous on the veins;

lower glumes 6.5-10 mm, 1(3)-veined;

upper glumes 7.5-12 mm, 3-5-veined;

lemmas 10-13 mm, oblong to lanceolate, rounded over the midvein, 7-veined, glabrous or appressed-hairy, sometimes scabridulous, apices acute, entire or minutely bifid;

awns 4-8 mm, straight or slightly spreading, arising less than 1.5 mm below the lemma apices;

anthers 2.5-5.2 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.

= 70.