Flora of North America species comparison

30-75 cm, erect, glabrous below.

rooting at the lower nodes, erect portion 5-20 cm, glabrous, pilose, or villous, particularly below the panicles.

mostly glabrous, hairy at the apices, hairs to 4 mm;

ligules 0.2-0.3 mm;

blades 10-25(40) cm long, 1-5 mm wide, involute, glabrous abaxially, scabridulous adaxially, sometimes also sparsely pilose.

mostly scabrous, margins sometimes with 0.1-0.4 mm hairs;

ligules 0.1-0.6 mm;

blades 1-4 cm long, 1-4.5 mm wide, flat or conduplicate, abaxial surfaces glabrous, adaxial surfaces appressed pubescent, hairs about 0.2 mm.

(3)5-30 cm long, 1-15 cm wide, from narrowly oblong, glomerate, and interrupted below to ovate and open;

primary branches 0.5-12(16) cm, appressed or diverging up to 40° from the rachises, stiff;

pulvini glabrous or sparsely hairy;

pedicels 0-1(3) mm, appressed, flattened.

terminal, 1-3 cm long, 0.6-2.5 cm wide, ovate, contracted, exerted or partially included in the upper leaf sheaths, rachises somewhat viscid, pilose or glabrous;

primary branches 0.5-1.5 cm, appressed to the rachises, each terminating in a spikelet;

pulvini sparsely pilose or glabrous;

pedicels 0.2-2 mm, shorter than the spikelets, glabrous or hairy.

6-16(23) cm long, 2.4-5 mm wide, ovate to linear-elliptic, flattened, stramineous, with reddish-purple margins or completely reddish-purple, with 10-45 florets;

disarticulation basipetal, florets falling intact and before the glumes.

5-26 mm long, 1.5-4.7 mm wide, linear to ovate, greenish to stramineous, with 16-60 florets;

disarticulation in the pistillate florets basipetal, the lemmas falling separately, staminate spikelets not or tardily disarticulating.

ovate-lanceolate to lanceolate, membranous;

lower glumes 1.7-3 mm;

upper glumes 2.2-4 mm, apices acuminate;

lemmas 2-6 mm, ovate, membranous to leathery, apices usually acuminate or attenuate, sometimes acute;

paleas 1.5-3 mm, membranous to leathery, narrower than the lemmas, apices obtuse, sometimes bifid;

anthers 2, 0.2-0.5 mm, brownish.

unequal, ovate, hyaline, glabrous or sparsely hirsute;

lower glumes 0.8-1.6 mm, 1-veined;

upper glumes 1.5-2.5 mm, 1-3-veined;

lemmas (1.5)1.8-4 mm, ovate, hyaline to membranous, lateral veins conspicuous, greenish, apices acute to acuminate, sometimes prolonged into a mucro, mucros to 0.4 mm;

paleas 0.7-3.8 mm, hyaline, about 1/2 as long as the lemmas in pistillate florets, as long as the lemmas in staminate florets, keels scabridulous;

anthers 3, 1.4-2.2 mm, reddish to yellowish.

0.8-1.3 mm, ellipsoid, somewhat laterally flattened, smooth, reddish-brown.

0.4-0.6 mm, ellipsoid, somewhat laterally compressed, smooth, light reddish-brown.

= 40.

= 60.