Flora of North America species comparison

10-79 cm, erect;

nodes glabrous.

20-60 cm, erect, base swollen, bulblike;

cataphylls pubescent;

nodes sparsely pubescent or glabrous.

glabrous, sparsely long pubescent distally;

ligules 1-2 mm;

blades 10-19 cm long, 1.4-8 mm wide, flat or conduplicate, glabrous or pubescent, apices involute.

pubescent or glabrous;

ligules 0.2-0.4 mm;

blades to 25 cm long, 1.9-6.2 mm wide, flat, glabrous, pubescent behind the ligules, margins scabrous, often ciliate basally.

terminal, usually composed of a digitate pair of branches, a third branch sometimes present below;

branches 1.1-7.9 cm, diverging to erect;

branch axes 0.4-1.4 mm wide, winged, glabrous, margins scabrous, terminating in a spikelet.

terminal, with 2-5(8) racemosely arranged branches;

branches 0.9-4.4 cm, divergent to spreading, terminating in a spikelet;

branch axes 0.2-0.5 mm wide, narrowly winged.

3-4.5 mm long, 1.1-2 mm wide, solitary, appressed to the branch axes, elliptic-lanceolate, glabrous, light stramineous, apices acute to acuminate.

1.3-2 mm long, 0.7-1 mm wide, paired (rarely appearing solitary as a result of aborted spikelets), imbricate, appressed to the branch axes, elliptic.

absent (rarely present);

upper glumes and lower lemmas glabrous, 3-veined;

upper florets white.

absent;

upper glumes and lower lemmas glabrous or sparsely and shortly pubescent basally or around the margins, 5-veined, margins entire;

lower lemmas lacking ribs over the veins;

upper florets 1.3-1.8 mm, stramineous to golden brown.

2.8-3.1 mm, yellow.

1.2-1.4 mm, ellipsoid, amber.

= 20, 40, 60.

= 40.