Flora of North America species comparison

50-175 cm, erect;

nodes glabrous.

30-100 cm, strongly decumbent, upright portion usually not standing more than 20 cm tall, much branched;

nodes glabrous.

glabrous or pubescent, lower sheaths more frequently pubescent than the upper sheaths;

ligules 1.5-3.8 mm;

blades to 35 cm long, 2-16.5 mm wide, flat, mostly glabrous, adaxial surfaces with a few long hairs near the base.

glabrous;

ligules 1-2.4 mm;

blades to 7 cm long, 3-6.5 mm wide, flat.

terminal, with 2-7 racemosely arranged branches;

branches 1.5-12 cm, racemose, divergent;

branch axes 0.7-1.4 mm wide, winged, glabrous, margins scabrous, terminating in a spikelet.

terminal, with 2-5 racemosely arranged branches;

branches 2-6 cm, diverging, persistent;

branch axes 2-3.3 mm wide, broadly winged, glabrous, margins scabrous, terminating in a spikelet.

2.3-4 mm long, 1.7-2.5 mm wide, paired, appressed to the branch axes, ovate, tapering to an acute apex, stramineous (rarely purple).

3.2-4 mm long, 1.6-1.7 mm wide, solitary, appressed to the branch axes, elliptic, abruptly pointed, stramineous.

absent;

upper glumes and lower lemmas 5-7-veined, margins pilose;

upper florets stramineous.

absent;

upper glumes and lower lemmas glabrous, 5-veined;

upper florets stramineous, lemmas with a few minute hairs at the apices.

2-2.3 mm, white to brown.

2-3 mm, white.

= 20, 40, 50-63.

= 40.