Glyceria leptostachya
Davy mannagrass, manna grass, narrow manna grass, slender-spike manna grass
50-100 (150) cm tall, 3-8 mm thick, spongy, erect to decumbent and rooting at the lower nodes.
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.
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.
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.
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.
= 40.
Glyceria leptostachya
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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