Flora of North America species comparison

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

10-60 cm, erect or geniculate at the base, slender, smooth, with 1-2(4) nodes.

smooth;

ligules 0.6-5 mm, dorsal surfaces scabridulous, apices acute to obtuse, entire or lacerate to erose;

blades 2-10 cm long, 1-3 mm wide, usually flat, sometimes involute, sometimes bristlelike, adaxial surfaces scabrous, abaxial surfaces sometimes scabrous.

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.

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.

2-15 cm long, (0.8)1-5.5(8) cm wide, lanceolate to oblong, somewhat open, often contracted after anthesis, lowest node with (1)3-8 branches;

branches scabrous, readily visible, more or less erect, branched mostly at or below midlength, spikelets closely clustered, lower branches 3-5 cm;

pedicels 0.5-2 mm.

lanceolate or oblong, purplish brown to greenish.

lanceolate to narrowly oblong, greenish, purplish, or brownish.

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, 2-4 mm, membranous, acute to acuminate;

lower glumes 1-veined, scabrous to scabridulous over the midvein;

upper glumes usually shorter than the lower glumes, 1(3)-veined, almost smooth;

callus hairs to 0.1 mm, sparse;

lemmas 1.5-2.4 mm, about 3/4 the length of the glumes, bases minutely pubescent, glabrous and smooth elsewhere, translucent to opaque, 5-veined, veins usually prominent distally, apices blunt, entire, usually awned from near the base, awns 2-4.5 mm, geniculate, rarely unawned;

paleas to about 0.2 mm;

anthers 3,1-1.8 mm.

0.8-1.5 mm;

endosperm solid.

0.8-1.3 mm;

endosperm solid.

= 28.

= 28.