Flora of North America species comparison

8-100 cm, erect or decumbent at the base, sometimes rooting at the lower nodes, with (2)3-6(8) nodes.

15-75 cm, erect, frequently geniculate at the base, sometimes weakly rooting at the lower nodes, with 2-4(6) nodes.

mostly cauline;

sheaths smooth or slightly scabrous;

ligules (1)1.7-8(11.2) mm, dorsal surfaces scabrous, apices truncate to obtuse, lacerate to erose;

blades 4-15 cm long, 2-7 mm wide, flat.

basal and cauline;

sheaths usually smooth, sometimes scabrous distally;

ligules 1-4 mm, dorsal surfaces scabridulous, apices truncate to obtuse or acute, erose-lacerate;

blades 1-10 cm long, 1-3 mm wide, usually flat, sometimes involute, usually scabrous, apices acute.

(3)5-30 cm long, 0.5-4 cm wide, contracted, spikelike, oblong, or lanceolate, usually dense, rarely more open, sometimes interrupted near the base, bases usually exserted, rarely enclosed by the upper sheaths at maturity, lowest node with 1-5 branches;

branches scabrous, ascending to appressed, spikelet-bearing to or near the base, usually hidden by the spikelets, spikelets crowded, lower branches 1-2(4) cm;

pedicels 0.2-4.3 mm.

3-10 cm long, 1-7 cm wide, open, often lax, lanceolate to broadly ovate, lowest node with 3-7 branches;

branches more or less scabrous, erect to spreading, usually branched above midlength, spikelet-bearing in the distal 1/3, patent at anthesis, lower branches 3-5 cm;

pedicels (0.4)1-3 mm.

lanceolate to narrowly ovate, greenish to purplish.

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

subequal to equal, 1.5-3.5 mm, scabrous on the midvein and sometimes on the back, 1(3)-veined, acute, elongate-acuminate, with an awnlike tip to 1 mm;

callus hairs to 0.3 mm, sparse to abundant;

lemmas 1.2-2.2 mm, smooth, translucent to opaque, 5-veined, veins prominent distally or obscure throughout, apices acute, entire or toothed, teeth no more than 0.12 mm, unawned or awned from above midlength, awns to 3.5 mm, straight or geniculate;

paleas absent or to 0.5 mm;

anthers 3, 0.3-0.6 mm.

subequal, 1.7-3 mm, 1-veined, scabrous only on the distal part of the midveins, acute;

callus hairs to 0.1 mm;

lemmas 1-2 mm, about 2/3 the length of the glumes, bases minutely pubescent, otherwise glabrous, translucent to opaque, 5-veined, veins prominent or obscure, apices acute to obtuse, entire, usually awned from near the base, awns to 5 mm, geniculate, rarely unawned, awned and unawned lemmas sometimes mixed within the panicle;

paleas absent, or to about 0.2 mm and thin;

anthers 3, 1-1.5 mm, at least 1/2 as long as the lemmas.

0.9-1.2 mm;

endosperm solid or soft.

0.8-1.2 mm;

endosperm solid.

= 28, 42, 56.

= 14.