Flora of North America species comparison

(10) 25-80(120) cm tall, 0.4-1.75 mm thick, usually erect;

nodes terete, usually 1-2 exserted.

26-50 cm tall, 0.5-0.9 mm thick, bases decumbent or nearly erect, frequently branching above the base, terete or weakly compressed;

nodes terete, 1-2 exserted.

closed for 1/2 - 7/8 their length, usually weakly compressed and keeled, usually scabrous, rarely smooth;

ligules 1.5-5(10) mm, smooth or scabrous, acute;

blades 1-7(10) mm wide, flat, lax, soft, finely scabrous, apices narrowly prow-shaped, cauline blades 2-10 cm.

closed for 2/5 – 7/10 their length, weakly keeled, sparsely scabrous, glabrous, bases of basal sheaths glabrous, distal sheath lengths 0.6-2.4 times blade lengths;

collars scabrous or pubescent on the margins;

ligules (1)2-3 mm, moderately densely scabrous, truncate, obtuse, or acute, lacerate to entire;

innovation blades to 20 cm, adaxial surfaces sparsely scabrous, glabrous or hispidulous on and between the veins;

cauline blades 1.5-2.4 mm wide, folded or flat, thin, soft, abaxial surfaces smooth, veins prominent, keel and margins scabrous, adaxial surfaces moderately scabrous over the veins, sparsely scabrous between the veins, apices narrowly prow-shaped, flag leaf blades 2.9-8.6(11) cm.

intravaginal.

extra-, pseudo-, and intravaginal.

10-25(30) cm, erect, eventually open, with (1)3-5(7) branches per node;

branches eventually spreading or reflexed, fairly straight, angled, angles usually moderately to densely scabrous, rarely sparsely scabrous.

(4)5.5-10.5(12.5) cm, erect, ovoid to broadly pyramidal, open, or eventually loosely contracted, sparse, with 10-40 spikelets;

nodes with 1-2 branches;

branches 2.1-4.5(7) cm, ascending, lax, angled, angles moderately to densely scabrous, less scabrous between the angles, with 1-9 spikelets.

(2)4-6 mm, laterally compressed, with 2-5 florets;

rachilla internodes about 1 mm, smooth, usually softly puberulent, infrequently glabrous.

5.3-9 mm, lengths to 3 times widths, laterally compressed, not sexually dimorphic;

florets (2)3-6(7);

rachilla internodes 1-1.3 mm, visible from the sides, usually sparsely to densely, coarsely scabrous, infrequently smooth.

slightly unequal, lanceolate, distinctly keeled, keels and sometimes the lateral veins sparsely to moderately scabrous;

lower glumes 1-3-veined;

upper glumes shorter than or subequal to the lowest lemmas;

calluses of some or all florets sparsely webbed;

lemmas 2.5-3.5 mm, lanceolate to narrowly lanceolate, distinctly keeled, crisply puberulent proximally, hairs evenly distributed, finely scabrous distally, lateral veins obscure to prominent, margins narrowly hyaline, glabrous, apices narrowly acute, infrequently anthocyanic;

palea keels sparsely scabrous, glabrous or softly puberulent at midlength, intercostal regions usually softly puberulent;

anthers 3, 0.2-1 mm.

distinctly keeled;

lower glumes (2)2.7-3.8 mm, 3-veined, upper glumes (2.3)2.9-3.9 mm;

calluses diffusely webbed, hairs 1/3-1/2 the lemma length;

lemmas (3.2)4.25-5 mm, lanceolate to narrowly lanceolate, distinctly keeled, glabrous, moderately to densely, infrequently sparsely, scabrous, lateral veins prominent, margins narrowly scarious, glabrous, apices acute to narrowly acute;

paleas 3/4 as long as to subequal to the lemmas, keels scabrous, intercostal regions scabrous;

anthers (1.4)1.75-2.6 mm, or vestigial (0.1-0.2 mm).

= unknown.

= unknown.