Flora of North America species comparison

(20)40-150 cm, decumbent, usually rooting at the lower nodes;

nodes pubescent;

internodes glabrous or with papillose-based hairs, hairs to 4.7 mm.

annual, usually solid, sometimes somewhat woody, sometimes decumbent, often branched above the base.

glabrous or with papillose-based hairs, hairs 0.5-4.7 mm;

ligules of hairs, 0.7-2.2 mm;

blades 3.6-27 cm long, 2-9(14) mm wide, flat, glabrous or pubescent, with or without papillose-based hairs.

distichous;

sheaths usually open;

auricles usually absent;

abaxial ligules usually absent, occasionally present as a line of hairs;

adaxial ligules membranous, sometimes also ciliate, or of hairs, sometimes absent;

blades sometimes pseudopetiolate;

mesophyll radiate or non-radiate;

adaxial palisade layer absent;

fusoid cells usually absent;

arm cells usually absent;

kranz anatomy absent or present;

midribs usually simple, rarely complex;

adaxial bulliform cells present;

stomata with triangular or dome-shaped subsidiary cells;

bicellular microhairs usually present, with a long, narrow distal cell;

papillae absent or present.

(4)6-22 cm long, (1.5)2.5-12 cm wide;

primary branches to 11 cm, ends of the primary branches, secondary branches, and pedicels capillary;

pedicels 0.6-5.3 mm, usually hairy distally, hairs to 6.3 mm.

ebracteate (Paniceae) or bracteate (most Andropogoneae) panicles, racemes, spikes, or complex arrangements of rames (in the Andropogoneae), usually bisexual, sometimes unisexual;

disarticulation usually below the glumes, frequently in the secondary and higher order axes of the inflorescences.

2-5.7 mm;

calluses hairy, hairs to 4 mm.

bisexual or unisexual, frequently paired or in triplets, the members of each unit usually with pedicels of different lengths or 1 spikelet sessile.

usually 2, equal or unequal, shorter or longer than the adjacent florets, sometimes exceeding the distal florets;

florets 2(-4), usually dorsally compressed, sometimes terete or laterally compressed;

lower florets sterile or staminate, frequently reduced to a lemma;

upper florets usually bisexual;

lemmas hyaline to coriaceous, lacking uncinate hairs, often terminally awned;

awns single;

paleas of bisexual florets well-developed, reduced, or absent;

lodicules usually 2, sometimes absent, cuneate, free, fleshy, usually glabrous;

anthers 1-3;

ovaries usually glabrous;

haustorial synergids absent;

style branches 2, free and close or fused at the base.

1.3-1.9 mm long, 0.6-0.9 mm wide.

hila usually punctate;

endosperm hard, without lipid;

starch grains simple;

embryos large in relation to the caryopses, usually waisted;

epiblasts usually absent;

scutellar cleft present;

mesocotyl internode elongated;

embryonic leaf margins usually overlapping, rarely just meeting, x = 5, (7), 9, 10, (12), (14).

glumes 0-1.7 mm, pubescent, sometimes with papillose-based hairs, apices rounded, truncate, or slightly cleft;

upper glumes (1.9)2.3-4.9 mm, enclosing the upper florets, gibbous basally, densely pubescent, hairs to 7 mm, sometimes papillose-based, varying from white to rose or darkish purple, apices tapering, beaked, glabrous, unawned or awned, awns to 4.1 mm;

lower florets staminate or sterile;

lower lemmas 1.9-4.8 mm, unawned or with awns to 4.2 mm;

lower paleas 0.9-4 mm;

anthers (0.8)1.5-2.6 mm, orange-brown to orange;

upper lemmas 1.8-2.7 mm, glabrous;

anthers 3, 1.2-1.7 mm, orange-brown to orange.

= 36.