Flora of North America species comparison

17-100 cm, erect.

9-85 cm, erect, sometimes decumbent at the base, sometimes rooting at the lower nodes, usually with 4-7 nodes.

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.

basal and cauline;

sheaths smooth or scabrous;

ligules 1-4.8(7.5) mm, dorsal surfaces scabrous, apices truncate to obtuse, erose-lacerate, sometimes ciliolate;

blades 2-12 cm long, 2-10 mm wide, upper blades broader than those below, flat.

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.

2-10 cm long, 0.5-2 cm wide, narrow and spikelike to dense, lobed-lanceolate, bases exserted or enclosed by the upper sheaths at maturity;

branches to 1.5 cm, scabrous, appressed, branching at the base and mostly hidden by the spikelets;

pedicels about 0.4-3 mm.

lanceolate, yellow-green, often tinged with purple.

lanceolate to narrowly ovate, yellowish, sometimes tinged with purple, or greenish purple.

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.

generally equal, 2-3.3 mm, 1-veined, densely scabrous, aculeolate on the veins, narrowly acute to acuminate or somewhat mucronate, mucros to about 0.5 mm;

callus hairs to 0.3 mm, usually dense;

lemmas 1.5-2.1 mm, smooth or scabridulous, translucent, (3)5-veined, veins prominent to obscure, sometimes prominent only distally, apices acute to obtuse, veins usually extended as teeth up to 0.3 mm, unawned or awned from above midlength, awns to 3.5 mm, straight, readily deciduous;

paleas 0.3-0.7 mm, thin;

anthers 3, 0.5-2 mm.

1.5-2 mm.

1-1.5 mm;

endosperm solid.

= 42.

= 42.