Flora of North America species comparison

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

30-80 cm, erect, usually with more than 3 nodes.

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.

mostly on the lower 1/2 of the culm;

basal leaves withered by anthesis;

lower leaf sheaths finely tomentose, the tomentum extending to below ground;

upper leaf sheaths smooth;

ligules 2.5-6 mm, dorsal surfaces scabridulous, apices acute to truncate, lacerate;

blades 10-16 cm long, 0.5-1(2) mm wide, flat, becoming involute.

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.

(4)10-17 cm long, 2-5 cm wide, broadly lanceolate, usually open, exserted from the upper sheaths at maturity, lowest node with 1-8 branches;

branches scabrous, generally ascending, mostly branching at about midlength, sometimes to near the base, lower branches 1.5-5 cm;

pedicels 0.4-5 mm.

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

lanceolate, slightly purplish.

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.

equal to subequal, 1.8-3 mm, 1-veined, scabridulous on the veins, sometimes also on the body, acute;

callus hairs to 0.3 mm, abundant;

lemmas 1.5-2 mm, scabridulous to warty throughout or only on the veins, translucent to opaque, 5-veined, veins prominent distally, apices truncate, minutely toothed to about 0.2 mm, awned on the lower 1/3, awns to 2.5 mm, geniculate, persistent;

paleas absent or minute;

anthers 3, 1-1.5 mm, usually shed at anthesis.

1-1.5 mm;

endosperm solid.

1-1.5 mm;

endosperm liquid.

= 42.

= unknown.