Flora of North America species comparison

10-55 cm, very slender, weak.

20-60 cm, slender, erect or the bases decumbent, terete or weakly compressed;

nodes terete, 1-2 exserted.

closed for 1/4 - 3/5 their length, terete, smooth or sparsely scabrous, margins not ciliate;

ligules 0.5-2 mm, smooth or sparsely scabrous, truncate;

blades 0.8-2 mm wide, flat, thin, soft, apices narrowly prow-shaped.

closed from 9/10 their length to their entire length, terete, smooth or sparsely scabrous, glabrous, bases of basal sheaths glabrous, distal sheath lengths 0.18-0.8 times blade lengths;

collars smooth, glabrous;

ligules 3-6 mm, scabrous, acute to acuminate;

innovation blades similar to the cauline blades;

cauline blades gradually reduced in length distally, 1.5-2.5 mm wide, flat, thin, soft, smooth or sparsely scabrous, primarily over the veins, apices narrowly to broadly prow-shaped, flag leaf blades 8-12 cm.

mostly extravaginal.

extravaginal, initiated as pinkish to purplish fleshy buds that persist as sets of short scales at the nodes of rhizomes and the proximal culm nodes, drying brownish and flabelliform after the shoots develop.

3-8(12) cm, lax, open, sparse;

nodes with 1-2(3) branches;

branches (2)3-7 cm, spreading to reflexed, capillary, angled, angles scabrous.

4-15 cm, erect, ovoid, sparse, with fewer than 15(20) spikelets;

nodes with 1-2 branches;

branches 1-4.5 cm, spreading to reflexed, slender, terete, sparsely to moderately scabrous, with 1-3 spikelets.

3.2-5.2 mm, laterally compressed, broadly lanceolate to ovate;

florets 2-3(5);

rachilla internodes smooth, glabrous.

5-9 mm, lengths to 3.5 times widths, laterally compressed, not sexually dimorphic;

florets 2-6;

rachilla internodes smooth, sparsely hairy, hairs to 0.3 mm.

narrowly lanceolate to lanceolate, thin, distinctly keeled, keels scabrous;

lower glumes 1-3-veined;

upper glumes shorter than or subequal to the adjacent lemmas;

calluses sparsely webbed;

lemmas 2.5-4 mm, lanceolate, green, distinctly keeled, keels and marginal veins short-villous, extending 2/3 – 4/5 the keel length, lateral veins fairly prominent, intercostal regions glabrous, apices obtuse to broadly acute, white, faintly bronze-colored or not;

palea keels scabrous;

anthers 0.2-0.8 mm.

1/3 – 3/4(4/5) as long as the adjacent lemmas, keels sparsely scabrous;

lower glumes 3-veined;

calluses glabrous or webbed, hairs at least 1-2 mm;

lemmas 4-7 mm, lanceolate, distinctly keeled, keels and marginal veins glabrous or short-villous, lateral veins obscure, glabrous, finely scabrous, intercostal regions glabrous or sparsely softly puberulent, margins glabrous, apices acute;

palea keels scabrous, sometimes softly puberulent at midlength;

anthers vestigial (0.1-0.2 mm) or 2-4 mm.

= unknown.

= ca. 58.