Flora of North America species comparison

4-60 cm, outer culms of a tuft decumbent, sometimes geniculate, branched at the lower nodes.

5-40 cm, slender, wiry, erect or slightly geniculate at the lower nodes;

lower internodes glabrous, shorter than those above.

mostly basal;

sheaths glabrous, sometimes scabridu-lous, becoming flattened, persistent;

ligules 0.2-0.5 mm, of hairs;

blades 0.7-8 cm long, 0.5-1.5(2) mm wide, scabridulous, margins often with papillose-based hairs basally.

2.5-10.5 cm, with (1)4-15 branches;

branches 5-45 mm, deciduous, densely pubescent (at least basally), with 2-10 spikelets per branch, axes extending 2-10 mm beyond the base of the terminal spikelets, apices entire;

disarticulation at the base of the branches, the break forming a sharp tip.

3-9 cm, with 2-7 branches;

branches 7-25 mm, persistent, spreading, ascending, or appressed, straight to slightly arcuate, with 8-24(32) spikelets, axes terminating in a spikelet;

disarticulation above the glumes.

appressed.

appressed to pectinate, reddish-purple;

with 1 bisexual floret and 1 rudimentary floret.

bilobed;

lower glumes 1.7-3.4 mm, slightly shorter than the upper glumes, veins excurrent to 0.6 mm;

upper glumes 1.9-4 mm, glabrous or pubescent, hairs not papillose-based, veins excurrent to 1 mm;

lower lemmas 1.2-2.2 mm, glabrous, sparsely appressed pubescent along the veins or densely appressed pubescent for much of their length and on the margins, trilobed, lobes veined, tapering into 3 awns, awns 2.2-6.6 mm, central awns not flanked by membranous lobes;

anthers 0.2-0.4 mm, yellow;

rachilla segments glabrous;

upper florets glabrous, of 3 equal awns, awns 2-7 mm.

2.5-3 mm.

0.8-1.5 mm long, 0.3-0.6 mm wide.

0.2-0.5 mm, membranous, lacerate or ciliate;

blades 2-5(9) cm long, 0.7-2 mm wide, flat or folded, adaxial surfaces sometimes with papillose-based hairs, margins usually with papillose-based hairs near the ligules.

spikelet on each branch with 1 floret;

lower glumes 1.5-3.5 mm, glabrous, narrow to subulate;

upper glumes 5.5-6.2 mm, densely pubescent, at least on the basal 1/2;

lemmas 5.8-6 mm, acuminate, unawned;

lowest paleas almost as long as the lemmas, bifid, glabrous;

rachillas prolonged beyond the florets for about 0.5 mm.

spikelets with 1 bisexual and 1 rudimentary floret, glumes unequal, glabrous, minutely scabrous on the keels; narrowly acute or acuminate;

lower glumes 1.5-2 mm;

upper glumes 5-6 mm, glabrous or sparsely pubescent basally, often divergent;

lowest lemmas 6-8 mm, veins pubescent, lateral veins excurrent as short (to 1 mm) awns, acuminate, midvein extended into a setaceous tip or a short awn;

lowest paleas 5-7 mm, bifid, veins often excurrent as short awns;

anthers about 2.5 mm, yellow or yellow and red;

distal florets reduced to a pubescent, 3-awned, awn column, awns 2-7 mm, exserted.

= 40.

= 20.