Poa paludigena
Poa ammophila
bog bluegrass, eastern bog bluegrass
bluegrass, sand bluegrass
10-55 cm, very slender, weak.
10-30 cm.
closed for 1/4 - 3/5 their length, terete, smooth or sparsely scabrous, margins not ciliate;
ligules 0.5-2 mm, smooth or sparsely scabrous, truncate;
blades 0.8-2 mm wide, flat, thin, soft, apices narrowly prow-shaped.
closed for 1/7 – 1/6 their length, terete, bases of basal sheaths glabrous;
ligules 1.5-3 mm;
innovation blades similar to the cauline blades;
cauline blades 1-3 mm wide, involute, moderately thick, soft, abaxial surfaces smooth, adaxial surfaces smooth or sparsely scabrous, apices narrowly prow-shaped.
mostly extravaginal.
intravaginal.
3-8(12) cm, lax, open, sparse;
nodes with 1-2(3) branches;
branches (2)3-7 cm, spreading to reflexed, capillary, angled, angles scabrous.
3-6 cm, congested or moderately congested;
nodes with (1)2(3) branches;
branches 1-3(4) cm, erect, terete, smooth or sparsely scabrous.
3.2-5.2 mm, laterally compressed, broadly lanceolate to ovate;
florets 2-3(5);
rachilla internodes smooth, glabrous.
5-7 mm, lengths to 3.5 times widths, broadly lanceolate, weakly laterally compressed, fairly drab;
florets 2-4;
rachilla internodes usually 1-1.3 mm, smooth.
narrowly lanceolate to lanceolate, thin, distinctly keeled, keels scabrous;
lower glumes 1-3-veined;
upper glumes shorter than or subequal to the adjacent lemmas;
calluses sparsely webbed;
lemmas 2.5-4 mm, lanceolate, green, distinctly keeled, keels and marginal veins short-villous, extending 2/3 – 4/5 the keel length, lateral veins fairly prominent, intercostal regions glabrous, apices obtuse to broadly acute, white, faintly bronze-colored or not;
palea keels scabrous;
anthers 0.2-0.8 mm.
lanceolate, distinctly keeled, keels smooth;
lower glumes 3-veined;
calluses glabrous;
lemmas 3-4.6 mm, lanceolate, distinctly to weakly keeled, evenly and densely strigulose over the proximal 1/3-1/2, hairs mostly about 0.1 mm, some keel hairs to 0.2(0.3) mm, lateral veins obscure, margins broadly scarious, glabrous, apices acute;
palea keels scabrous, softly puberulent at midlength, intercostal regions softly puberulent;
anthers 1.5-1.8 mm.
= unknown.
= unknown.
Poa paludigena
Poa ammophila
Poa paludigena is an inconspicuous species restricted to the northeastern United States. It grows in shady bogs and fens, often underneath other plants. Poa trivialis (p. 568) sometimes grows with P. paludigena; the former has distinctly longer ligules and anthers. Plants from the middle Appalachian Mountains are sometimes confused with P. sylvestris (p. 512). Poa paludigena is generally shorter and more slender, has shorter panicles with only 1-2 branches per node, is glabrous between the lemma veins and on the palea keels, has shorter anthers, and grows in colder habitats.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Poa ammophila is endemic to the Mackenzie River Delta region, Northwest Territories. It grows primarily north of treeline and, as its name indicates, usually on sandy soils. Its close relative, P. hartzii (see previous), also reaches the continental coastline in this region.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
IL Wildflowers
MI Flora
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