Flora of North America species comparison

30-130 cm, erect to slightly decumbent;

nodes 4-9, concealed or exposed, usually glabrous, rarely pubescent.

30-130 cm, erect or geniculate, usually hairy on or below the nodes.

evenly distributed;

sheaths usually glabrous, rarely hirsute, occasionally reddish or purplish;

auricles absent or to 1.8 mm, pale brown;

ligules shorter than 1 mm;

blades 2-14(18) mm wide, usually spreading or lax, sometimes becoming involute, basal blades similar to the upper blades, adaxial surfaces usually smooth, sometimes scabridulous, usually glabrous, occasionally pubescent.

evenly distributed;

sheaths glabrous;

auricles to 1.5 mm;

ligules 0.2-1.5 mm;

blades 10-30 cm long, 4-10 mm wide, flat, both surfaces scabrous, adaxial surfaces sometimes with hairs over the veins, hairs to 0.5 mm, veins not prominent, widely spaced.

(3)4-16(22) cm long, 1-2.2(2.5) cm wide, erect, the bases often sheathed, with 2 spikelets per node, rarely with 3 at some nodes;

internodes 3-5 mm long, 0.25-0.5 thick at the thinnest sections, smooth and glabrous, or scabrous, or with hairs beneath the spikelets.

5-20 cm long, 0.5-1.5 cm wide including the awns, 5-8 mm wide excluding the awns, erect or arching, with 1 spikelet per node;

internodes 4.5-7 mm, edges scabrous or ciliate, both surfaces hairy below the spikelets.

10-15 mm, appressed to slightly divergent, with (2)3-4(6) florets, lowest florets functional;

disarticulation below the glumes and each floret, or the lowest floret falling with the glumes.

10-15(20) mm long, 2-5(7) mm wide, appressed to slightly divergent, with 2-6 florets;

rachillas scabridulous or pubescent, often more densely pubescent distally;

disarticulation above the glumes, beneath each floret.

subequal or equal, the basal 1-4 mm terete, indurate, without evident venation, bowed out, yellowish, glume bodies 7-15 mm long, (0.5)0.7-2.3 mm wide, linear-lanceolate, widening above the base, 3-5(8)-veined, usually smooth or scabridulous, margins firm, awns 3-10(15) mm, straight;

lemmas 6-10 mm, scabridulous, glabrous or villous-hirsute, awns (5)8-20(25) mm, straight;

paleas 5-9 mm, obtuse;

anthers 2-3.5(4) mm.

equal to unequal, 0.6-1 mm wide, lanceolate to narrowly ovate, usually green, flat or weakly keeled, keels eccentric, adaxial surfaces hairy, hairs often inconspicuous, hyaline margins sometimes widest distally, narrowing abruptly to the acute to acuminate apices;

lower glumes 8-11 mm, 3-veined, usually awned, awns to 3 mm;

upper glumes 10-13 mm, 3-5-veined, sometimes awn-tipped, awns to 0.3 mm;

lemmas 9-13 mm, glabrous, smooth to somewhat scabridulous distally, rounded on the back proximally, awned, awns 7-20 mm, straight or flexuous;

paleas subequal to the lemmas, keels finely and densely ciliate over most of their length, straight or slightly outwardly curved, tapering to the apices, apices about 0.2 mm wide;

anthers 2-3 mm.

usually mid-June to late July (mid-August).

StH.

= 28.

= 28.