Flora of North America species comparison

30-120 cm tall, 0.8-2.5 mm thick, erect, seldom branched above the base;

internodes dull, mostly puberulent (sometimes sparsely so), terete, rarely keeled, strigose immediately below the nodes.

16-50 cm, decumbent, rooting at the lower nodes;

nodes retrorsely pilose;

internodes smooth or scabridulous.

scabridulous, slightly keeled;

ligules 0.2-0.6 mm, membranous, truncate, lacerate-ciliolate;

blades 2-15 cm long, 2-6 mm wide, flat, usually scabrous or scabridulous, occasionally smooth.

1.5-8.5 cm, sparsely or densely pilose, hairs to 3 mm, papillose-based;

ligules 0.5-0.8 mm, membranous, truncate, erose;

blades 2-6 cm long, 1.5-4 mm wide, flat, bases distinctly narrowed to the junction with the sheath, surfaces scabridulous and sparsely pilose, hairs papillose-based.

1.5-12 cm long, 0.3-1.8 cm wide, lobed, dense;

primary branches 0.2-2.5 cm, appressed;

pedicels absent or to 1 mm, strigose.

6-10.5 cm long, 2.0-4.5 cm wide, secund, open;

primary branches 0.8-3.5 cm, secund, spreading at right angles or somewhat reflexed, with 2-5 spikelets;

secondary branches not developed;

pedicels 1-5 mm, scabrous or shortly pilose, hairs papillose-based;

disarticulation at the base of the primary branches.

3-8 mm.

4-8 mm, dimorphic with respect to the glumes, proximal spikelets on each branch almost sessile.

subequal, 3-8 mm (including the awn), about 1.3-2 times longer than the lemmas, smooth or scabridulous distally, 1-veined, acuminate, awned, awns to 5 mm;

lemmas 1.9-3.1 mm, lanceolate, pubescent on the calluses, mid-veins, and margins, hairs to 1.2 mm, apices scabridulous, acuminate, unawned or awned, awns to 1 mm;

paleas 1.9-3.1 mm, lanceolate, loosely pilose between the veins, apices acuminate;

anthers 0.8-1.5 mm, yellowish.

of proximal spikelets on each branch subequal, 0.2-0.7 mm, orbicular, truncate, often erose, unawned;

glumes of distal spikelets on each branch markedly unequal;

lower glumes to 8 mm, 1-veined, acute, usually awned, awns 0.5-3 mm;

upper glumes orbicular, acute, sometimes awn-tipped;

lemmas 4.0-7.6 mm, linear to broadly lanceolate, light greenish, smooth or scabrous, usually with greenish veins, apices acuminate, awned, awns 6-19 mm, usually straight, scabrous;

paleas 3.7-6.8 mm, narrowly lanceolate, coarsely papillate or almost smooth, acuminate;

anthers 0.4-0.8 mm, yellowish.

1-1.6 mm, fusiform, brown.

1.8-3 mm, oblong-ovoid, flattened, brownish.

= 20.

= 20.