Glyceria notata
Glyceria alnasteretum
mark glyceria
Aleutian glyceria
25-80 cm, rooting at the nodes.
60-90 cm tall, 2.5-4 mm thick, erect.
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.
smooth, not keeled;
ligules 2-3 mm, rounded to truncate;
blades 5-20 cm long, 3-7 mm wide, abaxial surfaces smooth, adaxial surfaces scabrous, apices acute.
10-45 cm;
branches 2-5 per node, eventually widely spreading;
branches to 12 cm, with 5-15(19) spikelets;
pedicels 1-6 mm.
15-22 cm long, 12-16 cm wide, open, pyramidal, erect to nodding;
branches 8-10 cm, lower branches widely divergent to drooping.
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.
7-9 mm long, 3-4.5 mm wide, with 5-8 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.
unequal, lanceolate, acute;
lower glumes 2-3.5 mm;
upper glumes 2.5-3.5 mm, longer than wide;
lemmas 3-5.5 mm, 7-veined, obtuse to acute;
paleas shorter than or subequal to the lemmas, keels not winged, apices not strongly incurved, emarginate between the keels;
anthers 3, 0.7-1.2 mm.
1.5-2.5 mm.
not seen.
= 40.
= 20.
Glyceria notata
Glyceria alnasteretum
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 alnasteretum is included in this treatment with some hesitation, based on van Schaack 724 (W'l'LJ 152646) and van Schaack 887 (MO 1710727), both collected at Signal Point, Attu Island, Alaska in 1945. The above description is based on Komarov (1963) and Koyama (1987), modified to reflect the wider panicles and longer glumes and lemmas of the van Schaack specimens. The difference in habitat is troubling. The van Schaack specimens were found "in a beachside meadow" and "near beach." Koyama describes the habitat of G. alnasteretum as "wet meadows and marshes at high altitudes as well as subarctic zone" (p. 114). Nevertheless, the van Schaack specimens fit the description of G. alnasteretum better than any other taxon in this treatment. Clearly, further investigation is called for; it should include plants from both sides of the Bering Strait.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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