Flora of North America species comparison

10-75 cm, erect or geniculate, with 2-5 nodes.

17-100 cm, erect.

basal and cauline;

sheaths smooth;

ligules 0.3-2 mm, shorter than wide, dorsal surfaces usually scabridulous, sometimes smooth, apices truncate to rounded, erose-ciliolate, sometimes lacerate;

blades 3-10 cm long, 1-5 mm wide, flat.

mostly cauline or somewhat basally concentrated;

sheaths smooth;

ligules 2.3-7 mm, dorsal surfaces scabrous, apices acute, usually lacerate;

blades 6-20 cm long, 2-5 mm wide, flat.

3-20 cm long, less than 1/2 the length of the culm, (1)2-12 cm wide, stiffly erect, widely ovate, open, exserted from the upper sheaths at maturity, lowest node with (2)3-9(13) branches;

branches smooth or scabridulous, spreading during and after anthesis, spikelets usually confined to the distal 1/2, lower branches 1.5-7 cm;

pedicels 0.4-3.3 mm, adjacent pedicels divergent.

7-22 cm long, 1.5-5.5(7) cm wide, lanceolate to narrowly ovate, more or less open to dense, lowest node with 2-15 branches;

branches scabridulous, ascending to more or less appressed, mostly branching at or above midlength, some branching near the base, lower branches 1-5 cm;

pedicels 0.5-6 mm.

lanceolate or oblong, purplish brown to greenish.

lanceolate, yellow-green, often tinged with purple.

subequal, 1.7-3 mm, 1-veined, acute;

lower glumes scabridulous over the midvein towards the apices;

upper glumes scabridulous or smooth over the midvein;

calluses glabrous, or with a few hairs to 0.1 mm;

lemmas 1.2-2.5 mm, smooth, glabrous, opaque to translucent, 3(5)-veined, veins typically prominent, apices obtuse to acute, usually entire, sometimes the veins excurrent to 0.5 mm, usually unawned, rarely awned, sometimes varying within a panicle, awns to 2 mm, mid-dorsal, straight or geniculate;

paleas 0.6-1.2(1.4) mm, typically at least 1/2 the length of the lemmas, veins visible;

anthers 3, 0.8-1.3 mm.

equal to subequal, 2.5-4 mm, 1-veined, scabrous to scabridulous on the midvein, at least distally, sometimes also sparsely scabridulous over the back, acute to acuminate;

callus hairs (0.8)1-2 mm, abundant, conspicuous;

lemmas 2-3 mm, smooth, translucent to opaque, 5-veined, veins prominent at least distally, apices acute, entire or erose, sometimes toothed, teeth to about 0.2 mm, unawned;

paleas absent, or to 0.2 mm and thin;

anthers 3,1.5-2.3 mm.

0.8-1.5 mm;

endosperm solid.

1.5-2 mm.

= 28.

= 42.