Flora of North America species comparison

20-110 cm, erect;

nodes glabrous.

50-120 cm, erect;

nodes glabrous.

glabrous or pubescent;

ligules 0.2-0.5 mm;

blades 5-31 cm long, 2-10 mm wide, flat or conduplicate, glabrous or pubescent.

glabrous, sparsely pubescent apically;

ligules 2-5 mm;

blades to 21 cm long, 2-5 mm wide, flat, glabrous, pubescent behind the ligules, margins ciliate basally.

terminal, usually composed of a digitate pair of branches, 1-3 additional branches sometimes present below the terminal pair;

branches 3-15 cm, diverging to erect;

branch axes 0.7-1.8 mm wide, narrowly winged, glabrous, margins scabrous, terminating in a spikelet, distal spikelets sometimes reduced.

terminal, with 4-9 racemosely arranged branches;

branches 2-6.5 cm, divergent to erect, terminating in a spikelet;

branch axes 1.2-1.5 mm wide, winged, glabrous, margins scabrous.

2.5-4 mm long, 2-2.8 mm wide, solitary, appressed to the branch axes, broadly elliptic to ovate or obovate, glabrous, light stramineous to white, apices obtuse to broadly acute.

2.8-3 mm long, 1.5-1.6 mm wide, paired, imbricate, appressed to divergent from the branch axes, elliptic, stramineous.

2-3 mm, white.

glumes absent;

upper glumes glabrous, 5-veined;

lower lemmas 5-veined, margins inrolled;

upper florets light yellow to white.

glumes absent;

upper glumes and lower lemmas abundantly pubescent, hairs longer than 0.1 mm, 3-veined, margins entire;

lower lemmas lacking ribs over the veins;

upper florets 2.5-2.7 mm, white to stramineous.

= 20, 30, 40.

= 60.