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.

10-75 cm, erect or geniculate, with 2-7 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.

mostly cauline;

sheaths scabrous;

ligules 1-6 mm, dorsal surfaces scabridulous, apices acute to rounded, erose to lacerate;

blades 5-15 cm long, 1-4 mm wide, flat.

(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.

3-30 cm long, (2)5-20 cm wide, oblong to ovate, diffuse, usually over 1/2 the length of the culm, lowest node with (2)3-18 branches;

branches scabrous, erect to spreading, lower branches 4-15 cm;

pedicels (2.5)4-15 mm, much longer than the spikelets.

lanceolate to narrowly ovate, greenish to purplish.

lanceolate, usually purplish, sometimes green to yellowish green.

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, 1.3-2.1 mm, 1-veined, sparsely aculeolate on the veins, obtuse;

calluses glabrous;

lemmas 0.5-0.8 mm, transparent, thin, veins scarcely visible, smooth and glabrous or rarely hairy, apices truncate to rounded or acute, toothed or erose, usually unawned, rarely awned from near the base;

paleas 0.4-0.7 mm, about as long as the lemmas and of similar texture;

anthers 3,1-1.4 mm.

0.9-1.2 mm;

endosperm solid or soft.

0.6-0.8 mm.

= 28, 42, 56.

= 14.