Flora of North America species comparison

10-75 cm, erect or geniculate, with 2-5 nodes.

4-20 cm.

smooth, upper sheaths inflated;

ligules (0.6)1-1.5 mm, dorsal surfaces scabrous, apices truncate to rounded, lacerate to erose-ciliolate;

blades 1-2.5 cm long, 1-2 mm wide, flat or folded.

basal and cauline;

sheaths smooth;

ligules 0.3-2 mm, shorter than wide, dorsal surfaces usually scabridulous, sometimes smooth, apices truncate to rounded, erose-ciliolate, sometimes lacerate;

blades 3-10 cm long, 1-5 mm wide, flat.

3-20 cm long, less than 1/2 the length of the culm, (1)2-12 cm wide, stiffly erect, widely ovate, open, exserted from the upper sheaths at maturity, lowest node with (2)3-9(13) branches;

branches smooth or scabridulous, spreading during and after anthesis, spikelets usually confined to the distal 1/2, lower branches 1.5-7 cm;

pedicels 0.4-3.3 mm, adjacent pedicels divergent.

1.5-6 cm long, 0.4-2 cm wide, initially lanceolate, becoming ovate and diffuse, bases sometimes enclosed in the upper sheaths;

branches 1-3 cm, erect to spreading, scabrous;

pedicels 0.5-6.3 mm.

lanceolate or oblong, purplish brown to greenish.

ovate, green, slightly to strongly tinged with purple.

subequal, 1.7-3 mm, 1-veined, acute;

lower glumes scabridulous over the midvein towards the apices;

upper glumes scabridulous or smooth over the midvein;

calluses glabrous, or with a few hairs to 0.1 mm;

lemmas 1.2-2.5 mm, smooth, glabrous, opaque to translucent, 3(5)-veined, veins typically prominent, apices obtuse to acute, usually entire, sometimes the veins excurrent to 0.5 mm, usually unawned, rarely awned, sometimes varying within a panicle, awns to 2 mm, mid-dorsal, straight or geniculate;

paleas 0.6-1.2(1.4) mm, typically at least 1/2 the length of the lemmas, veins visible;

anthers 3, 0.8-1.3 mm.

equal, 2-2.5 mm, 1-veined, acuminate;

lower glumes scabrous on the midvein;

upper glumes smooth or scabrous on the midvein;

callus hairs to 0.1 mm, sparse;

lemmas 1.3-1.7 mm, scabrous, translucent to opaque, 5-veined, veins mostly obscure, apices truncate, entire, erose, or the veins excurrent to about 0.12 mm, unawned;

paleas to 0.2 mm, thin;

anthers 3, 0.5-0.9 mm, often retained at the apices of the caryopses.

0.8-1.5 mm;

endosperm solid.

1.2-1.5 mm;

endosperm semisoft.

= 28.

= unknown.