Flora of North America species comparison

10-40 cm, suberect, branching, fully or mostly emergent.

to 1+ m, bases prostrate and rooting at the nodes.

mostly basal or scattered along the culms, not conspicuously floating or streaming in the current;

sheaths glabrous or ciliate;

ligules to 5 mm, lanceolate, acuminate;

blades 3-30 cm long, 0.5-4 mm wide, glabrous, sometimes scabridulous.

mainly cauline, usually crowded distally, streaming in the current or floating on the surface, distal leaves sometimes emergent;

sheaths glabrous;

ligules 0.5-2 mm, subtriangular to truncate, sometimes erose;

pseudopetioles sometimes present;

blades 1-5(8) cm long, 1-4 mm wide, glabrous, sometimes pilose basally, scabridulous.

panicles.

spikes or racemes, spikelets sessile or shortly pedicellate.

1-1.3 mm, broadly ellipsoid to subglobose, smooth, lustrous.

1.3-2 mm, ovoid, asymmetrical, minutely striate, lustrous.

panicles 1-3 cm, terminal, with 10-25 spikelets;

staminate florets 3.5-8 mm, caducous;

lemmas lanceolate, 5-veined;

paleas similar, 3-veined;

anthers 6, 2-5 mm.

inflorescences 1-2 cm, terminal, partially exserted from the sheaths, emergent at anthesis, with 2-4 spikelets;

staminate florets 3-5 mm;

lemmas narrowly ovate, usually 5-veined;

paleas similar, usually 3-veined;

anthers 6,2-3.7 mm, linear.

panicles to 7 cm, arising from the lower to middle nodes of the culms, partially exserted from the sheaths, with 10-25 spikelets;

branches filiform, spreading to reflexed;

pistillate florets 2-2.5 mm, caducous;

lemmas 7-14-veined, erose to acuminate or caudate;

paleas similar to the lemmas, 5-10-veined;

stigmas 2-3 mm.

inflorescences 0.5-2 cm, mostly included in the subtending sheaths, only the stigmas visible, with 2 to few spikelets;

pistillate florets 1.4-3 mm, caducous;

lemmas 5-9-veined, acuminate;

paleas similar to the lemmas, 3-7-veined;

stigmas 3-6 mm.

= 24.

= 24.