Flora of North America species comparison

10-130 cm, erect, sometimes geniculate, glabrous, sometimes with a ring of glandular depressions below the nodes.

15-40(50) cm, erect, stiff, hard.

sometimes with glandular pits, pilose near the apices and on the collars, hairs to 4 mm, papillose-based;

ligules 0.2-0.5 mm, ciliate;

blades 5-25 cm long, 2-7(9) mm wide, flat, abaxial surfaces glabrous, adaxial surfaces scabridulous, occasionally pubescent near the base.

hairy at the apices, hairs to 2 mm;

ligules 0.2-0.4 mm, membranous, ciliate;

blades 2-15 cm long, (1)2-4 mm wide, involute, arcuate, glabrous abaxially, scabrous adaxially, apices sharply pointed.

(5)10-40 cm long, (2)4-18 cm wide, ovate, rachises angled and channeled;

primary branches 3-12(15) cm, solitary to whorled, appressed or diverging to 80° from the rachises;

secondary branches somewhat appressed;

pulvini glabrous;

pedicels 1-6(7) mm, almost appressed to narrowly divergent, stiff.

terminal, 6-20(24) cm long, 2-8(12) cm wide, ovate, open or contracted;

primary branches 1-8(15) cm, appressed or diverging up to 50° from the rachises;

pulvini glabrous or not;

pedicels 0-8 mm, appressed, lower pedicels on each branch shorter than 1 mm.

(4)5-10(11) mm long, 0.7-2.4 mm wide, ovate to linear-lanceolate, gray-green to purplish, with 5-11(15) florets;

disarticulation acropetal.

8-14 mm long, 1.4-3 mm wide, ovate to lanceolate, stramineous with a reddish-purple tinge, with 5-10 florets;

disarticulation basipetal, glumes persistent.

subequal, 0.7-2(2.3) mm, ovate to lanceolate, membranous;

lemmas 1.2-2.4 mm, ovate, membranous, glabrous or with a few hairs, gray-green, lateral veins evident, often greenish, apices acute;

paleas 1-2.2 mm, hyaline, keels scabrous, apices obtuse to truncate;

anthers 3, 0.2-0.5 mm, purplish.

unequal, chartaceous;

lower glumes 2.4-3.6 mm;

upper glumes 3-4.5 mm, sometimes 3-veined;

lemmas 3.8-4.5 mm, ovate, leathery, 3(4, 5)-veined, lateral veins evident, greenish, upper margins hyaline, apices acute to obtuse, usually erose;

paleas 3.8-4.5 mm, membranous, keels scabridulous, apices obtuse to truncate;

anthers 3, 2-2.4 mm, purplish to yellowish.

0.5-0.8(1) mm, ovoid to rectangular-prismatic, laterally compressed, shallowly to deeply grooved on the adaxial surface, striate, reddish-brown, distal 2/3 opaque.

1.6-2 mm, ellipsoid, dorsally flattened, with a shallow adaxial groove, striate, reddish-brown.

= 60.

= 40.