Flora of North America species comparison

22-130 cm, erect;

nodes glabrous.

30-130 cm tall, 1-5 mm thick, erect or weakly decumbent;

nodes 3-4, glabrous, glaucous.

often mostly basal, sometimes more evenly distributed;

sheaths glabrous or pubescent;

auricles usually present on the lower leaves, 0.5-1.5 mm;

ligules 0.1-0.5 mm, erose, sometimes ciliolate;

blades 1.5-6 mm wide, generally involute, abaxial surfaces usually glabrous, adaxial surfaces strigose, ribs subequal in size and spacing.

basal and cauline;

sheaths glaucous, glabrous or with hairs, lower sheaths sometimes hairy, upper sheaths glabrous, margins sometimes ciliate;

auricles 1.5-2.5 mm;

ligules about 0.3 mm;

blades 10-25 cm long, 3-10 mm wide, glabrous or pilose.

3.5-26 cm long, 0.5-1 cm wide, erect to slightly nodding, usually with 1 spikelet per node, sometimes with 2 at a few nodes;

internodes 3.5-15 mm long, 0.1-0.8 mm wide, glabrous or hairy.

10-22 cm long, 1.5-2.5 cm wide including the awns, 0.8-1 cm wide excluding the awns, inclined to nodding, with 1 spikelet at all or most nodes;

rachises scabrous on the edges, glabrous below the spikelets;

internodes 10-25 mm.

8-31 mm, 1.5-3 times longer than the internodes, appressed, with 3-11 florets;

rachillas glabrous or hairy, hairs to 1 mm;

disarticulation above the glumes, beneath each floret.

5-22 mm long, about 5 mm wide, appressed, with 4-12 florets;

disarticulation above the glumes, beneath the florets.

subequal, 5-14 mm long, 1/2 - 3/4 the length of the adjacent lemmas, 0.7-1.3 mm wide, lanceolate, glabrous or hairy, smooth or scabrous, 3-5-veined, flat or weakly, often asymmetrically keeled, keels straight, margins narrow, tapering from the base or from beyond midlength, apices acute to acuminate, sometimes mucronate or shortly awned;

lemmas 7-12 mm, glabrous or hairy, hairs all alike, sometimes scabrous, acute to awn-tipped, awns to 2 mm, straight;

paleas about equal to the lemmas, keels straight below the apices, smooth or scabrous proximally, sometimes hairy, scabrous distally, intercostal region glabrous or with hairs, apices 0.2-0.3 mm wide;

anthers (2.5)3-6 mm.

narrowly elliptic to lance-oblong, apices acute to acuminate;

lower glumes 5-11 mm;

upper glumes 7-13 mm;

lemmas 7-12 mm, mostly glabrous, glabrate, or sparsely hairy, margins with coarse stiff hairs, hairs to 1 mm, apices abruptly narrowed, awned, awns 10-20 mm, scabrous, strongly outcurved to recurved;

paleas 2/3 - 4/5 the length of the lemmas, keels winged distally, distinctly outwardly curved below the apices, apices 0.5-0.6 mm wide, truncate to rounded;

anthers about 2 mm.

StY.

= 28.

= 28.