Flora of North America species comparison

30-90 cm, erect, mostly smooth and glabrous, scabrous-pubescent immediately below the inflorescence, branching extravaginal, the new shoots with scaly cataphylls.

to 90 cm, erect, branching extravaginal, new shoots with scaly cataphylls.

mostly basal, greatly exceeded by the culms, flag leaf blades usually not reaching the inflorescence;

sheaths densely hairy or glabrous, with apical tufts of hairs, apical hairs 1-3.5 mm;

ligules 0.1-1 mm;

blades to 30 cm long and 5 mm wide, flat, folded, or rolled, pubescent or glabrous.

mostly basal, exceeded by or as long as the culms, flag leaf blades usually reaching the inflorescences;

sheaths glabrous or with scattered hairs, becoming brownish, with apical tufts of hairs, hairs to 4 mm;

ligules 0.2-0.5 mm;

blades (5)15-25 cm long, to 2 mm wide, flat or involute, glabrous or pubescent.

4-10 cm, racemose or paniculate, contracted;

pedicels much shorter than the spikelets.

5-15 cm, racemose or with a few branches, narrow;

rachises and pedicels scabrous.

9-15(18) mm, longer than the rachis internodes, with 5-10 florets;

rachilla segments 0.2-0.5 mm.

(7)10-13(16) mm, sometimes shorter than the rachis internodes, with 6-7(10) florets;

rachilla segments 0.1-0.2 mm.

8-14(17.5) mm, subequal, lanceolate, sometimes with scattered hairs;

lower glumes (5)7-9(11)-veined;

upper glumes 5-7(9)-veined;

calluses 0.5-1.2 mm, longer than wide, with marginal tufts of hairs usually reaching the lower lemma hairs;

lemma bodies (2)2.5-4 mm, 9-veined, lower row of hairs continuous or with weak central tufts, hairs of the marginal tufts not or just reaching the upper row of hairs, upper row of hairs composed of 2 marginal tufts, sometimes with 2 additional scanty tufts between, hairs reaching or slightly exceeding the base of the awn;

lobes 5-13 mm, aristate;

awns (7)9-16 mm;

paleas 3-6 mm, exceeding the lemma sinuses, emarginate, intercostal region glabrous or scabrous, margins glabrous or sparsely long-hairy, veins ciliate;

anthers 0.4-2.5 mm.

(7)8-13(16) mm, subequal, lanceolate, subacute, glabrous;

lower glumes (5)7-veined;

upper glumes 5(7)-veined, sometimes with a few hairs;

calluses (0.6)0.9-1.5(2) mm, with marginal tufts of hairs not or barely reaching the lower lemma hairs;

lemma bodies 2.5-3.5(4.5) mm, (7)9-veined, lower row of hairs dense, hairs not or just reaching the upper rows, upper row of hairs reaching or slightly exceeding the base of the awn, scanty medial tufts sometimes present;

lobes 5-10 mm, abruptly aristate;

awns 11-14 mm;

paleas 3.5-5 mm, exceeded by the lemma sinuses, emarginate, glabrous or with a few hairs, veins ciliate;

anthers 0.3-2 mm.

1.8-2.5(3) mm long, 0.8-1.1(1.6) mm wide;

embryos 0.7-1(1.5) mm;

hila 0.4-0.5(0.7) mm.

1.7-2.1(2.5) mm long, 0.8-1.1(1.3) mm wide;

embryos 0.8-0.9 mm;

hila 0.4-0.5 mm.

= unknown.

= 24.