Glyceria notata
Glyceria leptostachya
mark glyceria
Davy mannagrass, manna grass, narrow manna grass, slender-spike manna grass
25-80 cm, rooting at the nodes.
50-100 (150) cm tall, 3-8 mm thick, spongy, erect to decumbent and rooting at the lower nodes.
usually scabridulous or hirtellous;
ligules 2-8 mm;
blades 5-30 cm long, 3-11(14) mm wide, abaxial surfaces scabrous, adaxial surfaces sometimes scabridulous to scabrous, sometimes sparsely hairy, sometimes papillose.
finely scabridulous, not or weakly keeled;
ligules 4.5-12 mm, lacerate;
blades 12-30 cm long, 3.5-11 mm wide, both surfaces sometimes scabridulous, adaxial surfaces sometimes sparsely papillose.
10-45 cm;
branches 2-5 per node, eventually widely spreading;
branches to 12 cm, with 5-15(19) spikelets;
pedicels 1-6 mm.
20-40 cm long, 2.5-8 cm wide;
branches 4.2-14.7 cm, appressed to ascending, with 3-8(10) spikelets;
pedicels 2-5 mm, scabrous.
10-25 mm long, 1.5-3 mm wide, cylindrical and terete except slightly laterally compressed at anthesis, rectangular in side view, with 7-16 florets.
9-20 mm long, 0.4-3 mm wide, cylindrical and terete, except at anthesis when slightly laterally compressed, rectangular in side view, with 6-15 florets.
obtuse to rounded;
lower glumes 1-2.5 mm;
upper glumes 2.5-4.5 mm;
lemmas 3.5-5 mm, the submarginal veins often longer than those adjacent to the midvein, veins scabridulous, smooth or scabridulous between the veins, apices truncate to rounded, crenulate;
paleas from slightly shorter to slightly longer than the lemmas, keels winged distally, apices bifid, teeth about 0.2 mm;
anthers 0.8-1.5 mm.
broadly rounded to acute;
lower glumes 0.6-2.1 mm;
upper glumes 1.4-3.4 mm;
rachilla internodes 1-1.5 mm;
lemmas 2.6-4.5 mm, somewhat indented below the apical margins at maturity, veins raised, scabridulous to scabrous over and between the veins, prickles about 0.05 mm, midveins extending to within 0.1 mm of the apical margins, apices truncate to obtuse, crenulate;
paleas shorter than or equaling the lemmas, keels winged, tips parallel, intercostal region truncate or rounded, sometimes exceeding the keel tips;
anthers 3, 0.3-0.9 mm.
1.5-2.5 mm.
= 40.
= 40.
Glyceria notata
Glyceria leptostachya
Glyceria notata is a Eurasian species that has been reported from scattered locations in the Flora region; the reports have not been verified. In Europe, G. notata grows in rich, organic, wet soils, often near G. fluitans, with which it hybridizes. It is more tolerant of trampling than G. fluitans.
There is no single morphological characteristic that separates Glyceria notata from G. septentrionalis and G. leptostachya. It more frequently has lemmas with short veins adjacent to the midvein than the other two species, is more frequently smooth between the veins, more frequently has scabridulous leaf sheath, and tends to have more spikelets on its branches. The limited cpDNA data indicate that the three are distinct taxa (Whipple et al. [in press]). An intensive examination of the three species is needed.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Glyceria leptostachya grows in swamps and along the margins of streams and lakes, on the western side of the coastal mountains from southern Alaska to San Francisco Bay. It is similar to the European Glyceria notata, differing primarily in its tendency to have fewer spikelets [3-8(10) vs. 5-15(19)] on its branches.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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