Flora of North America species comparison

30-90 cm, glabrous;

basal branching mostly intravaginal.

20-50 cm, internodes smooth to scabridulous;

nodes glabrate;

basal branching intravaginal.

basally concentrated;

sheaths smooth or scabridulous;

ligules 1-4 mm, hyaline, truncate, rounded, or acute;

basal blades 4-15 cm long, 1-1.5 mm wide when flat, 0.5-0.8 mm in diameter when folded or convolute.

basally concentrated;

ligules 1.8-5.5 mm, hyaline, acute, often lacerate;

blades 4-16 cm long, 1-2.5 mm wide when flat, 0.6-1 mm in diameter when involute, abaxial surfaces smooth or scabridulous, adaxial surfaces scabridulous.

9-15 cm, lower nodes with 1-2 branches;

branches 1-6 cm, somewhat flexuous, ascending to divergent.

3.3-22 cm, lower nodes with 1-2(4) branches;

branches 1.8-11.6 cm, flexuous, initially appressed, becoming strongly divergent to reflexed, secondary and tertiary branches appressed to the primary branches.

subequal, 3-6 mm long, 1.3-2 mm wide, ovate, 1-3-veined, apices acute to mucronate;

florets 2.2-4.5 mm, obovoid, dorsally compressed;

calluses 0.2-0.5 mm, hairy, disarticulation scars elliptic;

lemmas coriaceous, evenly pubescent, tan at maturity, margins widely separated even when immature;

awns 5-15 mm, persistent, once- or twice-geniculate, first segments strongly twisted;

paleas similar to the lemmas in length, texture, and pubescence;

anthers 1-2 mm;

ovaries developing 2 conelike style bases, each bearing a single, unbranched style.

subequal, 3.2-5.3 mm, exceeding the florets by 0.2-1.5 mm, ovate to broadly lanceolate, 1-9-veined, apices acute to acuminate;

florets 2.4-4.1 mm, dorsally compressed;

calluses about 0.3 mm, hairy, disarticulation scars round;

lemmas coriaceous, evenly pubescent, hairs to 0.5 mm, becoming tawny with age, margins not overlapping at maturity;

awns 1-2.5 mm, straight or slightly arcuate, caducous;

paleas 2.1-3.6 mm, similar to the lemmas in texture and pubescence;

anthers 1.7-2.2 mm, penicillate;

ovaries truncate, bearing 2 styles.

about 2.5 mm long, 0.5 mm thick;

hila linear, almost equaling the caryopses.

1.8-2 mm long, about 0.8 mm thick;

hila linear, about 9/10 the length of the caryopses.

= 22.

= 20.